Hi, The density is very much a linear chain, without side branches. That would lead me to discount a DTT adduct, since I can't see anywhere for the hydroxls to go?
Thanks, Dr Richard Cowan Research Associate HWLSB 1/05 Department of Biochemistry University of Leicester Lancaster Road Leicester, LE1 9HN, U.K. Phone +44 (0) 116 229 7077 ________________________________ From: Petri Kursula <petri.kurs...@gmail.com> Sent: 27 March 2020 21:13 To: Cowan, Richard H. (Dr.) <rc...@leicester.ac.uk> Cc: CCP4BB@jiscmail.ac.uk <CCP4BB@JISCMAIL.AC.UK> Subject: Re: [ccp4bb] Covalent Cysteine Aduct Looks like DTT adduct to me; but then again, if you did not have it, it probably is not. Petri Petri Kursula ---------- Professor ---------- Department of Biomedicine University of Bergen, Norway http://www.uib.no/en/rg/petrikursula<https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.uib.no%2Fen%2Frg%2Fpetrikursula&data=02%7C01%7Crc273%40leicester.ac.uk%7C5bd2d6eed27e46e7fa0908d7d293afd2%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C637209404081752652&sdata=XJzM3H1DJS4TGdmEMzAryNn2YQYpuxcoVkmp9u6sric%3D&reserved=0> petri.kurs...@uib.no ---------- Faculty of Biochemistry and Molecular Medicine Biocenter Oulu University of Oulu, Finland ---------- On 27 Mar 2020, at 22:06, Cowan, Richard H. (Dr.) <rc...@leicester.ac.uk<mailto:rc...@leicester.ac.uk>> wrote: Hi Robbie et al., I'm very sure on the crystallization conditions, but I'll check the purification for BME, although it seems unlikely, since the crystallized protein is a Fab. What I would be less sure on is the age of the reagents used. Is anyone aware of significant breakdown products which might be more reactive, particularly the alcohols? Thanks, Dr Richard Cowan Research Associate HWLSB 1/05 Department of Biochemistry University of Leicester Lancaster Road Leicester, LE1 9HN, U.K. Phone +44 (0) 116 229 7077 ________________________________ From: robbie_joos...@hotmail.com<mailto:robbie_joos...@hotmail.com> <robbie_joos...@hotmail.com<mailto:robbie_joos...@hotmail.com>> Sent: 27 March 2020 20:57 To: Cowan, Richard H. (Dr.) <rc...@leicester.ac.uk<mailto:rc...@leicester.ac.uk>> Cc: CCP4BB@JISCMAIL.AC.UK<mailto:CCP4BB@JISCMAIL.AC.UK> <CCP4BB@JISCMAIL.AC.UK<mailto:CCP4BB@JISCMAIL.AC.UK>> Subject: Re: [ccp4bb] Covalent Cysteine Aduct Are you absolutely sure about the conditions? The blob next to the sulfur looks pretty fat so I would guess BME. Cheers, Robbie On 27 Mar 2020 21:32, "Cowan, Richard H. (Dr.)" <rc...@leicester.ac.uk<mailto:rc...@leicester.ac.uk>> wrote: Hi All, During the current enforced shutdown, I've been going back over some older data and spotted this in one of my structures: [cid:ddddd2ff-a10c-4f19-9f47-4db92e7620ef] It's what appears to be a covalent aduct onto a cysteine on the surface (originally modeled as 2 waters!). The condition was optimized from the Morpheus Screen condition D1, so MES/Imidazole pH 6.5, PEG 500MME, PEG20k and a mix of 1,6-Hexanediol, 1-Butanol, 1,2-Propanediol, 2-Propanol, 1,4-Butanediol and 1,3-Propanediol. The data has been cut at 1.7A, with good stats. Has anyone seen anything like this before? what do you think my best bet for modeling this is? and aduct of 1,3-propanediol? It looks too short for 1-butanol or 1,4-butandiol, and it's linear so 2-propanol and 1,2-propanediol seem unlikely. Thanks, Dr Richard Cowan Research Associate HWLSB 1/05 Department of Biochemistry University of Leicester Lancaster Road Leicester, LE1 9HN, U.K. Phone +44 (0) 116 229 7077 ________________________________ To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fcgi-bin%2Fwebadmin%3FSUBED1%3DCCP4BB%26A%3D1&data=02%7C01%7Crc273%40leicester.ac.uk%7C5bd2d6eed27e46e7fa0908d7d293afd2%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C637209404081762648&sdata=gDloUDVOknS%2FQmgqdRDMXy9xq3fRhaijorPWkoKsjL4%3D&reserved=0> ________________________________ To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.jiscmail.ac.uk%2Fcgi-bin%2Fwebadmin%3FSUBED1%3DCCP4BB%26A%3D1&data=02%7C01%7Crc273%40leicester.ac.uk%7C5bd2d6eed27e46e7fa0908d7d293afd2%7Caebecd6a31d44b0195ce8274afe853d9%7C0%7C0%7C637209404081762648&sdata=gDloUDVOknS%2FQmgqdRDMXy9xq3fRhaijorPWkoKsjL4%3D&reserved=0> ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/webadmin?SUBED1=CCP4BB&A=1
