Re: [ccp4bb] Non-Cysteine modification with heavy atom

2019-01-02 Thread Tom Peat
Hello Chandra, Soaking heavy atoms into crystals has a long and successful history (I use it pretty often and it works much of the time). If you need phase information and you have some crystals, I would certainly give it a try. There are many papers and books to give you methods to do this

Re: [ccp4bb] Non-Cysteine modification with heavy atom

2019-01-02 Thread Jesko Koehnke
Dear Chandra, A Million ways to die in the West (or when screening for HA derivatives). But this has always worked for me: https://www.cell.com/structure/fulltext/S0969-2126(00)00168-4 Just analyse ability to still form complex after modification. Cheers, Jesko Am Mi., 2. Jan. 2019, 20:42 hat

Re: [ccp4bb] Non-Cysteine modification with heavy atom

2019-01-02 Thread Artem Evdokimov
Off the top of my head, assuming nothing much about your protein(s) - some of this is only going to work if you can modify the protein(s) prior to crystallization. This excludes the 'normal' heavy atom soaking type stuff which can give rise to binding with covalent-like strength (while still being

[ccp4bb] Non-Cysteine modification with heavy atom

2019-01-02 Thread Chandramohan Kattamuri
Dear CCP4 members, Can someone suggest to me a methodology to covalently modify (non-cysteine) on component of a multicomponent complex with heavy atoms in order to achieve better phase determination? Thanks in advance Chandra kattamuricha...@yahoo.com