Re: [ccp4bb] unknown density in 1.6 A structure

2021-06-03 Thread Peer Mittl
Dear Nick, I like your idea and your comments on this substance. 1,2-hexandiol supposed to be chiral but probably it is used as a racemic mixture in cosmetics. There is even a crystal structure in the PDB (4EUS) and an associated 3 letter code. I´ll give it a try because it seems to fit

Re: [ccp4bb] unknown density in 1.6 A structure

2021-06-03 Thread Sevvana, Madhumati
Hi Peer, Reminds me of a lipocalin structure I solved which co-purified fatty acid with it. I could model fatty acids and we along with our collaborators used several complementary biophysical methods followed by functional assays to identify the ligand.

Re: [ccp4bb] unknown density in 1.6 A structure

2021-06-03 Thread Andrew Mesecar
Dear Peer, This reminds me of my colleague Michael Rossmann's discovery of a Pocket Factor which is a fatty acid-like molecule residing in a hydrophobic pocket underneath the "canyon" in enteroviruses. See https://link.springer.com/article/10.1007/s13238-014-0092-6. You likely have an endogenous

Re: [ccp4bb] unknown density in 1.6 A structure

2021-06-03 Thread Dom Bellini - MRC LMB
Hi Peer, If I understand you correctly you are saying that you do not know what substance may be in the density; then perhaps you only need to extend by an extra atom to create a new kind of symmetrical molecule that will fit the density? BW, D On 03/06/2021 11:55, SHEPARD William wrote:

Re: [ccp4bb] unknown density in 1.6 A structure

2021-06-03 Thread SHEPARD William
Hi Peer, Have you tried to model the hydroxyl O1 disordered at the carbonyl position? Check the H-bonding pattern to the end groups, this might give some clues. Cheers, Bill Le 03/06/21 12:50, « Peer Mittl » a écrit : >I'm struggling with the electron density shown in the attachment. The