Re: [ccp4bb] AW: Differences in a homodimer protein

2017-11-29 Thread Denis Rousseau
eanor Dodson [eleanor.dod...@york.ac.uk] Sent: Wednesday, November 29, 2017 1:07 PM To: Denis Rousseau Cc: CCP4BB@JISCMAIL.AC.UK Subject: Re: [ccp4bb] AW: Differences in a homodimer protein I would submit the coordinates to PISA to analyse the buried surface area for each momnomer and see if there are

Re: [ccp4bb] AW: Differences in a homodimer protein

2017-11-29 Thread Eleanor Dodson
29, 2017 10:32 AM > To: CCP4BB@JISCMAIL.AC.UK > Subject: Re: [ccp4bb] AW: Differences in a homodimer protein > > I have seen this in MnSOD. We had a tetramer in the ASU and each > active site had different ligands in our peroxide soak. I assumed the > crystal lattice can influe

Re: [ccp4bb] AW: Differences in a homodimer protein

2017-11-29 Thread Denis Rousseau
: Differences in a homodimer protein I have seen this in MnSOD. We had a tetramer in the ASU and each active site had different ligands in our peroxide soak. I assumed the crystal lattice can influence these things or it is inappropriate metal incorporation. I would highly recommend doing ICP-MS on a

Re: [ccp4bb] AW: Differences in a homodimer protein

2017-11-29 Thread Gloria Borgstahl
I have seen this in MnSOD. We had a tetramer in the ASU and each active site had different ligands in our peroxide soak. I assumed the crystal lattice can influence these things or it is inappropriate metal incorporation. I would highly recommend doing ICP-MS on a dissolved crystal and on your pu

[ccp4bb] AW: Differences in a homodimer protein

2017-11-28 Thread Herman . Schreuder
Dear Denis, I would first superimpose both monomers to see if you can find a reason why one subunit has a bound water and the other not, which would in general be flanking side chains in (slightly) different positions. Next I would look for some global differences between the subunits that coul