[ccp4bb] Graphics software to show epitope foot-print

2008-05-14 Thread ANSV (Anders Svensson)
Dear colleagues,
 
I am looking for a graphics software program that can make the
following, easily.  Make a surface representation of a macromolecule.
That surface should be coloured according to some property.  On, or
close to, that surface the outer rim of a binding epitope from a second
molecule should be indicated by a line or string, a foot-print
representation, without altering the original colouring of the surface.
 
Unfortunately I can not find out any program that can make it easily, or
have not understood all features of the programs.  Can anyone help?
 
Kind regards
Anders Svensson

__

Anders Svensson
Novo Nordisk A/S
Denmark


 


Re: [ccp4bb] problem of crystallization

2008-05-14 Thread Anastassis Perrakis
... your protein is the dream of any NMR spectroscopist. Small and  
ultra-soluble.


Maybe just do the structure by NMR? It should be totally  
straightforward for any NMR lab.


A.

On May 13, 2008, at 18:16, Jennifer Han-Chun Tsai wrote:


Hi,

This topic is not related to CCP4. I am having problem of  
crystallizing one protein. It's a pretty small protein with size  
around 15kDa. I have stock concentration around 100mg/mL.  
Crystallization plates I set up are with concentration of 10mg/mL,  
30mg/mL and 50mg/mL. All the plates had been set up at least one  
week. Only around 5 wells per plate or less formed precipitation.  
The rest of wells are pretty clear still. Is there any suggestion  
for reducing protein solubility or increasing the chance of getting  
crystals?


Thanks for your time,
Jennifer


[ccp4bb] any review on protein-protein complex crystallization?

2008-05-14 Thread Maarten Dewilde
Dear CCP4bb,

 

Can anyone point me to good reviews or books which describe how to
crystallize protein-protein complexes (or anyone willing to share his/her
experience)? In particular I'm interested in:

 

(1)   which tests to perform on your complex before you even start thinking
about crystallization

(2)   what should you take in account when you start to crystallize (any
other than 'use the Radaev and Sun' screen)

(3)   how to increase the success rate of crystallization (cross linking?
co-expression?)

(4)   any alternative techniques when crystallization fails (any other than
NMR)

 

I would be very grateful!

 

Thanks in advance,

 

Maarten

 

 

 

 

__

 

Maarten Dewilde - PhD student

 

Laboratory for Pharmaceutical Biology
ON2 - PB 824 - Herestraat 49 
3000 Leuven

 

 mailto:[EMAIL PROTECTED]
[EMAIL PROTECTED]
tel: +32 16 323434
fax: +32 16 323460

 

 



Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm



[ccp4bb] Fixing waters around metal atom

2008-05-14 Thread Jendrek

 Hi,

 I have a structure with a metal beautifully coordinated by 3 water molecules.
However, every time I run automated water picking they get removed (due to 
combination of being too close to metal/too deep in the density).


 So far I've been manually reentering them into pdb but it becomes a bit
frustrating.

 Is there a way to fix those waters during water picking?

 Regards, Andrzej

--

Andrzej LYSKOWSKI, Ph.D. ([EMAIL PROTECTED])

Institute of Biotechnology - Structural Biology  Biophysics
P. O. Box 65, Viikinkaari 1
FIN-00014 University of HELSINKI, FINLAND

TEL.: 358 9 191 58955
FAX : 358 9 191 59940


[ccp4bb] Call for synchrotron beam time at EMBL Hamburg

2008-05-14 Thread Victor Lamzin

Dear Colleague,

This is a gentle reminder of our call for beam time applications
at EMBL Hamburg that we circulated a few weeks ago.
We kindly ask you to complete your beam time proposal
by the deadline of ---  16 May 2008 

If you have already taken action, you can ignore this message.

---
EMBL HAMBURG UNIT

   Call for access to Synchrotron Beamline Facilities 2008

We announce a call for synchrotron beam time applications in biological
X-ray crystallography (PX) and small-angle scattering (SAXS).
Up to 12 weeks of beam time will be available at the DORIS storage ring
(DESY) during the period September 2008 until December 2008.
The EMBL Outstation will operate the following beamlines:

BeamlineTypeWavelength Scientist responsible
X11 PX  0.80 A Paul Tucker
X12 PX  tuneable   Manfred Weiss
X13 PX  0.80 A Matthew Groves
X33 SAXS1.5 A  Dmitri Svergun, Manfred Roessle

The deadline for submission of proposals is May 16th, 2008. An external
Priorities Committee will assess the proposals.

Electronic beam proposal forms and detailed description of the beamline
facilities are available via the web links
http://www.embl-hamburg.de and http://www.embl-hamburg.de/services

In parallel, EMBL-Hamburg is constructing three new beamlines for
applications in biological X-ray crystallography (PX) and small-angle
scattering (SAXS) at the Petra-III synchrotron storage ring, with an
expected opening in 2010/11. Further information can be obtained under
http://www.embl-hamburg.de/services/petra.

Two of the DORIS-III beamlines (BW7A, BW7B) will be used as test
beamlines for future Petra-III applications. Depending on circumstances,
they may become temporarily available to the external user community.

Applications to use the EMBL-Hamburg high-throughput crystallisation
facility can be made at any time at
http://www.embl-hamburg.de/services/crystallisation

Further information can be obtained by tel. +49-40-89902-110,
(fax +49-40-89902-149), Email [EMAIL PROTECTED] (PX),
[EMAIL PROTECTED] (SAXS).

Access to the EMBL Hamburg facilities is supported by the European
Commission, Research Infrastructure Action under the FP6 'Structuring the
European Research Area Specific Programme', Contract Number
RII3-CT-2004-506008.

---


[ccp4bb] refinement problem

2008-05-14 Thread parkash

Hi,
 I have one structural refinement problem.
I am working on a protein crystals which diffracted to 2.8 Å. But when I 
refine through REFMAC5, with 0.1 wt(geometry to x-ray terms), I get high 
B-factors around 70. But if I do TLS refinement, the R-factors lower 
down and B-factors come down to 40.


My question is; Are TLS refined B-factors real?? Can I trust them?
or what else could be done to lower down the B.factors?

BR
vimal


Re: [ccp4bb] pdb format

2008-05-14 Thread Nicolas Soler

Hi Raja

You can use a command-line script like this one:

#!/bin/tcsh
sed -e /ATOM/ s/'/*/g -e /ATOM/ s/O5T/O3T/ -e /ATOM/ s/ADE/ DA/g 
-e /ATOM/ s/CYT/ DC/g -e /ATOM/ s/GUA/ DG/g -e /ATOM/ s/THY/ DT/g 
$1refmacok_$1

cat refmacok_$1|grep ATOM|more/dev/tty


Save the script in a new file (ex:DNArefmac.sh) and make sure it is
executable on your computer (in a terminal type chmod -x DNArefmac.sh). 
I used it for rna

to convert from CNS format to refmac, and adapted it for dna.

Just put it in the same directory with your pdb then run it (ie: sh
DNArefmac.sh thing.pdb).
It will normally produce a new pdb suitable for refmac.called
refmacok_thing.pdb and also display it on the terminal.

Hope this will help.

Nicolas


Raja Dey wrote:

Hi,
The out pdb file from 'CNS' or from 'O' is not readable in  
'CCP4'.  I have dna and protein in my pdb file. Do you the best way to 
convert the pdb file I got from 'CNS or from 'O' into 'CCP4' format? 
Especially CCP4 follows 1 letter code for dna whereas CNS and O follow 
3 letter code. Looking forward to hearing from you

Thanks...
Raja


BMR - a key player in weight issues. Know more. 
http://in.rd.yahoo.com/tagline_glue_4/*http://in.search.yahoo.com/search?fr=na_onnetwork_mail_taglinesei=UTF-8rd=r1p=basal+metabolic+rate



--
Nicolas Soler
Institut de Chimie des Substances Naturelles
91190 Gif-sur-Yvette
tel 33-1-69823764
fax 33-1-69823784
http://perso.nicodam.org/


Re: [ccp4bb] problem of crystallization

2008-05-14 Thread Bernhard Rupp
I would suggest to open the wells, add some hefty precipitant
to the reservoir, and close the wells again.
The point is to drive the equilibrium further towards high concentration
by drawing more water into the reservoir.

It therefore does not matter what the supplemental precipitant is.
Concentrated AMS, PEG, whatever as long as it has no volatile
component which might uncontrollably affect pH in the drop.

BR


-Original Message-
From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of
Anastassis Perrakis
Sent: Wednesday, May 14, 2008 1:28 AM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] problem of crystallization

... your protein is the dream of any NMR spectroscopist. Small and
ultra-soluble.

Maybe just do the structure by NMR? It should be totally straightforward for
any NMR lab.

A.

On May 13, 2008, at 18:16, Jennifer Han-Chun Tsai wrote:

 Hi,

 This topic is not related to CCP4. I am having problem of 
 crystallizing one protein. It's a pretty small protein with size 
 around 15kDa. I have stock concentration around 100mg/mL.
 Crystallization plates I set up are with concentration of 10mg/mL, 
 30mg/mL and 50mg/mL. All the plates had been set up at least one week. 
 Only around 5 wells per plate or less formed precipitation.
 The rest of wells are pretty clear still. Is there any suggestion for 
 reducing protein solubility or increasing the chance of getting 
 crystals?

 Thanks for your time,
 Jennifer


[ccp4bb] looking for software

2008-05-14 Thread Vellieux Frederic

Dear all,

I am looking for some software (computer program) that would take a full 
PDB file (including waters) and that would output a list of the water 
networks (including the names of the atoms) at the surface of a protein.


Thank you in advance,

Fred.
begin:vcard
fn:Fred. Vellieux (Ph.D)
n:Vellieux (Ph.D);Fred.
email;internet:[EMAIL PROTECTED]
tel;work:+33 438789605
version:2.1
end:vcard



Re: [ccp4bb] problem of crystallization

2008-05-14 Thread Tom Walter
A few ideas:

1) go even higher with protein concentration. Some ultra-soluble proteins may 
need 100 mg/mL. You may have to set up drops at higher ratios of 
protein:precipitant to achieve this. e.g. 3:1 or more. Use a test such as the 
Hampton PCT to tell you when you are in the right concentration range.

2) reductive methylation of lysine residues as Stephen suggested. This often 
reduces the solubility of proteins and will change the surface properties.

3) get rid of any glycosylation as the surface sugars increase solubility (and 
are flexible anyway and so bad for crystallization)

4) check the few drops which have precipitate and look for common factor e.g. 
2M Ammonium Sulphate. You could then add a small amount of this ingredient 
(e.g. 100mM Ammonium Sulphate) to your protein and then re-screen.

5) Wait a bit longer. One week is still early days.

Good luck
Tom

**  Tom Walter B.Sc. M.Res.   **
** Oxford Protein Production FacilityTel: +44 (0)1865 287747  **
** Wellcome Trust Centre for Human Genetics  Fax: +44 (0)1865 287547  **
** Roosevelt Drive   [EMAIL PROTECTED]   **
** Headington, Oxford OX3 7BNhttp://www.oppf.ox.ac.uk **


 Original message 
Date: Tue, 13 May 2008 11:16:41 -0500
From: Jennifer Han-Chun Tsai [EMAIL PROTECTED]  
Subject: [ccp4bb] problem of crystallization  
To: CCP4BB@JISCMAIL.AC.UK

   Hi,

   This topic is not related to CCP4. I am having problem of
   crystallizing one protein. It's a pretty small protein with
   size around 15kDa. I have stock concentration around 100mg/mL.
   Crystallization plates I set up are with concentration of
   10mg/mL, 30mg/mL and 50mg/mL. All the plates had been set up
   at least one week. Only around 5 wells per plate or less
   formed precipitation. The rest of wells are pretty clear
   still. Is there any suggestion for reducing protein solubility
   or increasing the chance of getting crystals?

   Thanks for your time,
   Jennifer 


[ccp4bb] Oxford cryostream 700 series to give away

2008-05-14 Thread Adriana Miele

Dear BBorders,

the lab is giving away a complete and perfectly functional Oxford 
Cryosystems Cryostream 700 series.

For more information, please contact me outside the bulletin, please.

Best regards

Adriana Erica Miele

-
Adriana E. Miele, Ph.D.
Dipartimento di Scienze Biochimiche
Sapienza Universita' di Roma
P.le A. Moro 5
00185 Roma
tel.: +3906 49910713
fax: +3906 4440062
eMail: [EMAIL PROTECTED]


Re: [ccp4bb] Graphics software to show epitope foot-print

2008-05-14 Thread Liz Potterton
Hi Anders and CCP4bb

Would something like

http://www.ysbl.york.ac.uk/~ccp4mg/index_info_5.html

(done with CCP4mg) be useful?  In that image the molecule surface is coloured 
by electrostatics (but could be any other property) and the contact area to a 
ligand is indicated by dots on the surface.

Liz


On Wednesday 14 May 2008 08:34, ANSV (Anders Svensson) wrote:
 Dear colleagues,

 I am looking for a graphics software program that can make the
 following, easily.  Make a surface representation of a macromolecule.
 That surface should be coloured according to some property.  On, or
 close to, that surface the outer rim of a binding epitope from a second
 molecule should be indicated by a line or string, a foot-print
 representation, without altering the original colouring of the surface.

 Unfortunately I can not find out any program that can make it easily, or
 have not understood all features of the programs.  Can anyone help?

 Kind regards
 Anders Svensson

 __

 Anders Svensson
 Novo Nordisk A/S
 Denmark


[ccp4bb] Alternate Ligand Conformations

2008-05-14 Thread Kathleen Frey
Hello.

I am trying to refine a structure that has 2 ligand conformations as seen in
the electron density. I tried to put both conformations in Coot and format
the PDB similar to a residue alternate conformation and changing the
occupancies to 0.50 for each conformation. This formatting did not work when
I ran Refmac5 for the Refinement. Has anyone had this issue before? And can
anyone suggest a PDB format that will work in Refmac5?

Thanks,
Kathleen


Re: [ccp4bb] Graphics software to show epitope foot-print

2008-05-14 Thread ANSV (Anders Svensson)
Hi Liz,

Yes, that's a smart solution. I will have a try on my own data.
Many thanks.

Anders

-Original Message-
From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of
Liz Potterton
Sent: 14. maj 2008 14:10
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] Graphics software to show epitope foot-print

Hi Anders and CCP4bb

Would something like

http://www.ysbl.york.ac.uk/~ccp4mg/index_info_5.html

(done with CCP4mg) be useful?  In that image the molecule surface is
coloured by electrostatics (but could be any other property) and the
contact area to a ligand is indicated by dots on the surface.

Liz


On Wednesday 14 May 2008 08:34, ANSV (Anders Svensson) wrote:
 Dear colleagues,

 I am looking for a graphics software program that can make the 
 following, easily.  Make a surface representation of a macromolecule.
 That surface should be coloured according to some property.  On, or 
 close to, that surface the outer rim of a binding epitope from a 
 second molecule should be indicated by a line or string, a foot-print 
 representation, without altering the original colouring of the
surface.

 Unfortunately I can not find out any program that can make it easily, 
 or have not understood all features of the programs.  Can anyone help?

 Kind regards
 Anders Svensson

 __

 Anders Svensson
 Novo Nordisk A/S
 Denmark


Re: [ccp4bb] looking for software

2008-05-14 Thread Eleanor Dodson

Vellieux Frederic wrote:

Dear all,

I am looking for some software (computer program) that would take a 
full PDB file (including waters) and that would output a list of the 
water networks (including the names of the atoms) at the surface of a 
protein.


Thank you in advance,

Fred.
watertidy does something like this - it produces a bastard format but it 
does give meaningful names..

eleanor


Re: [ccp4bb] refinement problem

2008-05-14 Thread Eleanor Dodson

parkash wrote:

Hi,
 I have one structural refinement problem.
I am working on a protein crystals which diffracted to 2.8 Å. But when 
I refine through REFMAC5, with 0.1 wt(geometry to x-ray terms), I get 
high B-factors around 70. But if I do TLS refinement, the R-factors 
lower down and B-factors come down to 40.


My question is; Are TLS refined B-factors real?? Can I trust them?
or what else could be done to lower down the B.factors?

BR
vimal



This is or should be a FAQ - all B factors after TLS are relative to the 
TLS restraints
Try running TLSANL and that should give you back a more meaningful 
overall B


Eleanor


[ccp4bb] Metal-Ligand Link tag

2008-05-14 Thread Eric Salgado

Hello all,
  I have a structure that has a Ni coordinated by an Asp residue and 
the backbone of two other residues. When I try to include Link 
statements for this in my pdb, refmac fails and says that a new ligand 
has been found.
  I was wondering if anyone knew what proper tag for these interactions 
might be; what library file might actually contain them; or how to 
generate a new ligand in sketcher that includes at least some part of 
the existing residue definitions.



Thank you in advance,

Eric Salgado


[ccp4bb] poll: cutoff for high resolution

2008-05-14 Thread Mark Del Campo
At what refinement resolution or resolution ranges would you call a structure 
high resolution vs. 
low resolution?  I realize that this may boil down to semantics (e.g. some 
may classify structures as 
medium resolution), but I wanted to get an opinion from the pros.


Re: [ccp4bb] poll: cutoff for high resolution

2008-05-14 Thread Edward Snell
I don't think you can give a resolution range - you could argue that it
depends on molecular weight, i.e. high resolution for insulin and high
resolution for the ribosome are going to be very different numbers.

Other than that, my answer would be that you know it when you've got it
:)

Cheers,

Eddie.

Edward Snell Ph.D.
Assistant Prof. Department of Structural Biology, SUNY Buffalo,
Hauptman-Woodward Medical Research Institute
700 Ellicott Street, Buffalo, NY 14203-1102
Phone: (716) 898 8631 Fax: (716) 898 8660
Email: [EMAIL PROTECTED]  Telepathy: 42.2 GHz
 
Heisenberg was probably here!
 

-Original Message-
From: CCP4 bulletin board [mailto:[EMAIL PROTECTED] On Behalf Of
Mark Del Campo
Sent: Wednesday, May 14, 2008 3:28 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] poll: cutoff for high resolution

At what refinement resolution or resolution ranges would you call a
structure high resolution vs. 
low resolution?  I realize that this may boil down to semantics (e.g.
some may classify structures as 
medium resolution), but I wanted to get an opinion from the pros.


Re: [ccp4bb] poll: cutoff for high resolution

2008-05-14 Thread Pavel Afonine
I think this is coupled with the data completeness. Say you have a data 
50.0-1.0A resolution, but the completeness in say 3.0-1.0A resolution 
range is equal to 10%, and it is 100% complete in 50.0-3.0A.

Pavel.


On 5/14/2008 12:28 PM, Mark Del Campo wrote:
At what refinement resolution or resolution ranges would you call a structure high resolution vs. 
low resolution?  I realize that this may boil down to semantics (e.g. some may classify structures as 
medium resolution), but I wanted to get an opinion from the pros.
  


[ccp4bb] While on the subject of stereo

2008-05-14 Thread David Roberts
OK, so we weren't on this subject, and all of you are tired of me 
asking.  However, the following link came to me and I wanted to see some 
programmers opinions on this one.  The thing I'm wondering is, what 
needs to be done on the programming end to make this something that we 
could use in a classroom to show molecules in stereo.  It seems like it 
would be fun, and I actually think it would work well, though I don't 
know if it would work with more than one person looking at the screen at 
a time (now that I really think about it, probably not - nevermind).  If 
it only works with one person, can we use this for modeling?


Just curious

www.ted.com/index.php/talks/view/id/245

Dave


Re: [ccp4bb] While on the subject of stereo

2008-05-14 Thread Warren DeLano
Hi David,
 
This has already been done with PyMOL.  There's a video at:
 
http://molviz.cs.toronto.edu/molviz/
 
and the code is downloadable.
 
The stereo effect isn't so great with both eyes open, but I do think there is 
potential for use of head or object tracking as a means of controlling rotation.
 
Cheers,
Warren



From: CCP4 bulletin board on behalf of David Roberts
Sent: Wed 5/14/2008 12:59 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: [ccp4bb] While on the subject of stereo



OK, so we weren't on this subject, and all of you are tired of me
asking.  However, the following link came to me and I wanted to see some
programmers opinions on this one.  The thing I'm wondering is, what
needs to be done on the programming end to make this something that we
could use in a classroom to show molecules in stereo.  It seems like it
would be fun, and I actually think it would work well, though I don't
know if it would work with more than one person looking at the screen at
a time (now that I really think about it, probably not - nevermind).  If
it only works with one person, can we use this for modeling?

Just curious

www.ted.com/index.php/talks/view/id/245

Dave






Re: [ccp4bb] poll: cutoff for high resolution

2008-05-14 Thread William Scott

On May 14, 2008, at 12:28 PM, Mark Del Campo wrote:

At what refinement resolution or resolution ranges would you call a  
structure high resolution vs.
low resolution?  I realize that this may boil down to semantics  
(e.g. some may classify structures as

medium resolution), but I wanted to get an opinion from the pros.


This really needs to take into account the numerical resolution vs.  
inherent-coolness-factor tradeoff matrix.


For example, if the macromolecule is comprised of 100% amino acids and  
catalyzes a reaction in the Krebs cycle, high resolution is 0.5*(C=C),  
the carbon-carbon double-bond length.  If it is a snRNP, 7Å is  
moderate resolution.


[ccp4bb] User proposal submission for Collaborative Crystallography at BCSB

2008-05-14 Thread Banumathi Sankaran
Dear Users,

The Berkeley Center for Structural Biology (BCSB) is pleased to
announce the launch of a Collaborative Crystallography Pilot 
Program  (CC) at the Advanced Light Source in Berkeley. Through 
this program, scientists will be able to send protein crystals to BCSB 
staff researchers for data collection and analysis. The CC Pilot 
Program can provide an number of benefits to researchers:

   * Obtain high quality data and analysis through collaborating with
 expert beamline researchers;
* Rapid turn around on projects;
* Reduced travel costs.

 Thumbnail Description:
==

The Collaborative Crystallography program will be piloted on
beamlines 5.0.1 and 5.0.2 for one year; if successful it will be
 implemented on a permanent basis. CC proposals will go through 
the egular ALS General User proposal review process for beamtime
allocation. Proposals will be reviewed and ranked by the Proposal
Study Panel, and beamtime will be allocated accordingly. BCSB 
staff will schedule the projects to fit into the available 
 resources.
Only non-proprietary projects will be accepted. As a condition of
participation, BCSB staff researchers who participate in data
collection and/or analysis must be appropriately acknowledged -
typically being included as authors on publications and in PDB
depositions. Please consult the website for additional 
information at:
 
http://bcsb.als.lbl.gov/wiki/index.php/Collaborative_Crystallography
How To Apply:
 =

To submit a proposal, go to:

http://alsusweb.lbl.gov/4DCGI/WEB_GetForm/PXProposalEntry.shtml/Initialize
For question 3 select Collaborative PX 501/502. For question 9,
please describe a specific research project with a clear end 
point. In order to request CC time for July/August, 2008, proposals must be 
submitted
by May 15, 2008. The deadline for CC proposals for the time period 
September/October 2008 is July 15, 2008.

Regards,

Banumathi Sankaran


[ccp4bb] Position in protein crystallography, Novartis. Insts. for Biomedical Research - Emeryville

2008-05-14 Thread Bussiere, Dirksen
Please note that qualified B.S. and M.S. level research associates are
invited to apply.  

 

Structural Chemistry, Structure-Based Drug Design  Discovery

Novartis Institutes for BioMedical Research, Emeryville, California

 

 Use your scientific expertise to aid us in our structure-based drug
design efforts. Your task will be the determination of high-resolution,
three-dimensional structures of macromolecular drug targets (typically
proteins), including crystallization and structure solution of medically
important structures and target-ligand complexes.  As a part of an
integrated team you will interact with computational chemists and
medicinal chemists to design new scaffolds and improve lead compounds.
The ideal candidate will have a B.S. or M.S. degree and 2 or more years
of work experience, or a Ph.D. and 2 or more years of postdoctoral
and/or work experience.   Degrees in Biochemistry, Chemistry, or
Molecular Biophysics are acceptable. Experience in protein biochemistry,
protein crystallization, and crystallographic methods are necessary and
pharmaceutical industry experience is a plus.  Strong computational and
molecular modeling skills, experience in solution studies (calorimetry,
NMR, etc.) and/or experience in structure-based drug design would be
useful.  You should have excellent verbal and written communication
skills and the ability to work in large, multidisciplinary project
teams. 

 

To join our global team, please submit your CV online at
http://www.novartisvaccines.com/jobs
http://www.novartisvaccines.com/jobs  , referencing Brassring
requisition number 2294.

 

Any questions about the position should be sent to
[EMAIL PROTECTED]
 

 

 


Re: [ccp4bb] refinement problem

2008-05-14 Thread krish
Hi,
 It would be nice if you mention more clearly how you have done
TLS..i.e.,domains or individual residues or molecules !! You should keep in
mind that you have 2.8A data. I would do TLSANL with domains or molecules.

Best regards,
Krishna Ch
PhD Student
Hannover Medical school
Germany
On Wed, May 14, 2008 at 11:36 AM, parkash [EMAIL PROTECTED] wrote:

 Hi,
 I have one structural refinement problem.
 I am working on a protein crystals which diffracted to 2.8 Å. But when I
 refine through REFMAC5, with 0.1 wt(geometry to x-ray terms), I get high
 B-factors around 70. But if I do TLS refinement, the R-factors lower down
 and B-factors come down to 40.

 My question is; Are TLS refined B-factors real?? Can I trust them?
 or what else could be done to lower down the B.factors?

 BR
 vimal



Re: [ccp4bb] any review on protein-protein complex crystallization?

2008-05-14 Thread Jesse Sundlov
This may be obvious, but I would run a size-exclusion column on the complex
first.  This will give you an idea as to how well these two proteins stick
together.

On Wed, May 14, 2008 at 4:34 AM, Maarten Dewilde 
[EMAIL PROTECTED] wrote:

  Dear CCP4bb,



 Can anyone point me to good reviews or books which describe how to
 crystallize protein-protein complexes (or anyone willing to share his/her
 experience)? In particular I'm interested in:



 (1)   which tests to perform on your complex before you even start
 thinking about crystallization

 (2)   what should you take in account when you start to crystallize (any
 other than 'use the Radaev and Sun' screen)

 (3)   how to increase the success rate of crystallization (cross linking?
 co-expression?)

 (4)   any alternative techniques when crystallization fails (any other
 than NMR)



 I would be very grateful!



 Thanks in advance,



 Maarten









 __



 Maarten Dewilde - PhD student



 Laboratory for Pharmaceutical Biology
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[ccp4bb] UV light source for protein xtal detection

2008-05-14 Thread Torres-Larios Alfredo

Dear all,

Here's another non CCP4 question: does anyone know a cheap alternative 
to set up a UV source at 280 nm? I'd really like to have one :), but I 
really don't have the $20K Dlls needed to buy a UV/white light source 
from the crystallographic vendors :(.


Thanks so much in advance for your answers, Alfredo.

Alfredo Torres-Larios, PhD
Assistant Professor
Instituto de Fisiologia Celular, UNAM.
Ciudad Universitaria, Mexico


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Re: [ccp4bb] looking for software

2008-05-14 Thread sekar
Hi,

Please try the following web based tool
to get a list of the water networks
in a given PDB file.

http://iris.physics.iisc.ernet.in/psap/

Please click on the option Display water Bridges.

regards,

Sekar



 Dear all,

 I am looking for some software (computer program) that would take a full
 PDB file (including waters) and that would output a list of the water
 networks (including the names of the atoms) at the surface of a protein.

 Thank you in advance,

 Fred.

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receipt of this mail please

All best wishes and regards,

Yours sincerely,

Sekar, K. Ph.D.
Bioinformatics Centre
(Centre of Excellance in Structural Biology and Bio-computing)
Supercomputer Education and Research Centre
Indian Insitute of Science
Bangalore 560 012
INDIA

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