Dear Pavel and Eleanor

 

TLS records in mmCIF are standardised, so parameters from all refinement 
packages should be consistent with each other. 

 

Regards

 

John

 

From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> On Behalf Of Pavel Afonine
Sent: 19 November 2019 23:00
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] TLS parameters

 

Dear Eleanor,

 

Phenix reads and writes TLS records, both PDB and mmCIF format. It can also 
read (but not write) TLS records in REFMAC and BUSTER format.

 

In ATOM records Phenix outputs complete B factors, which includes both 
individual and TLS components (this is why they have ANISOU).

 

Phenix won't re-define (or define from scratch) TLS groups automatically unless 
it is asked to do so.

 

Pavel 

 

On Tue, Nov 19, 2019 at 7:36 AM Eleanor Dodson 
<0000176a9d5ebad7-dmarc-requ...@jiscmail.ac.uk 
<mailto:0000176a9d5ebad7-dmarc-requ...@jiscmail.ac.uk> > wrote:

And what about PHENIX?

E

 

On Tue, 19 Nov 2019 at 15:33, Pierre Rizkallah <rizkall...@cardiff.ac.uk 
<mailto:rizkall...@cardiff.ac.uk> > wrote:

I can vouch for TLS blocks being used by REFMAC and the PDB validation servers, 
after some frustration I had with a deposition recently:
Towards the end of a refinement, I renamed some chains, to make oligomers in 
the a.u. contiguous in real space. Validation told me the centre of gravity as 
declared in the header is not the same as that produced from the coordinates. I 
edited the input TLS file, but it still produced the same outcome. I eventually 
realised that REFMAC reads the TLS blocks from the input PDB after reading all 
the other input instructions for the refinement run. This happening last, it 
overrides the declarations in the input TLS definitions file. In order to get 
the coordinates and the definitions to match, I had to remove the TLS blocks, 
produced by an earlier run of REFMAC, from the pdb input file, so that the new 
definitions can be followed, and appropriate TLS blocks produced. REFMAC would 
use pre-existing TLS blocks if they are in the PDB file.

The mismatch notwithstanding, REFMAC still worked correctly, although the 
shifts from the group origins would have looked strange if one tries to analyse 
the TLS motions with TLSANL. I admit, I don't view them. Moral of the story is, 
be careful when you rename chains at the end of the refinement!

Pierre Rizkallah
*******************************************************
Dr Pierre Rizkallah, Senior Lecturer Structural Biology 
Institute of Infection & Immunology, Sir Geraint Evans Building, 
School of Medicine, Heath Campus, Cardiff, CF14 4XN
email: rizkall...@cardiff.ac.uk <mailto:rizkall...@cardiff.ac.uk>         
phone: +44 29 2074 2248
http://www.cardiff.ac.uk/people/view/126690-rizkallah-pierre

-----Original Message-----
From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK <mailto:CCP4BB@JISCMAIL.AC.UK> 
> On Behalf Of Robbie Joosten
Sent: 19 November 2019 15:14
To: CCP4BB@JISCMAIL.AC.UK <mailto:CCP4BB@JISCMAIL.AC.UK> 
Subject: Re: [ccp4bb] TLS parameters

Hi Eleanor,

The blocks are reliably recorded in PDB entries but in some cases the 
renumbering of residues was not pushed through to TLS groups. Certain 
selections cannot be captured in the PDB format, for instance the split in main 
chain and side chain that Refmac allows. Fortunately that feature is hardly 
used.
Parsing TLS records is not straightforward, particularly the sets from Buster 
suffered a lot from inconsistent manual editing in the early days of TLS 
refinement. PDB-REDO's extractor does a decent job in getting selections and 
changing those into Refmac format, but there are definitely cases that it 
cannot do. We also have a tool that does this for mmCIF files which is not 
written by me and (therefore) much more sophisticated in handling more 
complicated cases. 

Cheers,
Robbie

> -----Original Message-----
> From: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK 
> <mailto:CCP4BB@JISCMAIL.AC.UK> > On Behalf Of Eleanor 
> Dodson
> Sent: Tuesday, November 19, 2019 3:59 PM
> To: CCP4BB@JISCMAIL.AC.UK <mailto:CCP4BB@JISCMAIL.AC.UK> 
> Subject: [ccp4bb] TLS parameters
> 
> Does anyone know how reliably the different programs record and use 
> these blocks from the PDB file?
> 
> Eleanor
> 
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