Re: [ccp4bb] non-specific disulfide bonds in crystal structures

2014-12-22 Thread Isupov, Michail
York Department of Chemistry, MR-1135 160 Convent Avenue New York, NY 10031 Tel. (212) 650-6070 www.khayatlab.org Original message >Date: Sat, 20 Dec 2014 10:44:25 -0800 >From: CCP4 bulletin board (on behalf of Christine Gee ) >Subject: Re: [ccp4bb] non-specific disulfide

Re: [ccp4bb] non-specific disulfide bonds in crystal structures

2014-12-21 Thread mesters
Hello Todd, if your protein is a cytosolic protein (reductive environment; for ER, Golgi, mitochondria things look different), the disulfide bond formation you observe is most probably the result of the oxidative environment (outside the cell) in combination with the crystal packing that that

Re: [ccp4bb] non-specific disulfide bonds in crystal structures

2014-12-20 Thread Reza Khayat
, MR-1135 160 Convent Avenue New York, NY 10031 Tel. (212) 650-6070 www.khayatlab.org Original message >Date: Sat, 20 Dec 2014 10:44:25 -0800 >From: CCP4 bulletin board (on behalf of Christine Gee ) >Subject: Re: [ccp4bb] non-specific disulfide bonds in crystal structu

Re: [ccp4bb] non-specific disulfide bonds in crystal structures

2014-12-20 Thread Christine Gee
Hi Todd, I used to work on PNMT which also is supposedly monomeric and formed a disulfide between monomers in the crystals. See http://www.sciencedirect.com/science/article/pii/S1570963905000968?via=ihub We showed that it was irrelevant to activity. Cheers Christine Sent from my iPad > On 20

[ccp4bb] non-specific disulfide bonds in crystal structures

2014-12-20 Thread Todd Jason Green
Hello All- I have recently determined a domain structure of a larger protein. The structure shows a clear disulfide bond between two monomers in the asymmetric unit. I'm trying to figure out if this is an artifact of the crystal packing or has biological relevance. The protein has been reported