Re: [ccp4bb] challenges in structural biology

2019-07-21 Thread Peat, Tom (Manufacturing, Parkville)
I will agree with Artem here- Having knowledge as to whether crystallisation is likely or not with a given protein/ complex would be extremely useful. If there were a set of screens/ tests/ experiments that one could run to show that it was 99% certain that something was not going to work (or

Re: [ccp4bb] challenges in structural biology

2019-07-21 Thread Artem Evdokimov
Dear Kay I disagree that 'magic bullet' is impossible. I think the definition is wrong here - magic bullet to me is a rational set of methods that (when executed with precision and care) enable crystallization to the maximum possible benefit. This includes everything - constructs,

Re: [ccp4bb] challenges in structural biology

2019-07-21 Thread Artem Evdokimov
Dear Kay, Even the small, badly diffracting and 'messed up' crystals are still crystals. There is literally a phase transition (pun very much intended) between growing *usable crystals* versus *having no crystals* (or having crystals that do not qualify as 'diffraction quality' even under the

Re: [ccp4bb] challenges in structural biology

2019-07-21 Thread Phoebe A. Rice
Hi All, Agreed! Crystallization methods have improved in some ways, but at least in my experience the real energy barrier is usually knowing enough about the quirky biochemistry of the particular idiosyncratic complex we happen to be working on. That means that one may need a grant's

Re: [ccp4bb] challenges in structural biology

2019-07-21 Thread Kay Diederichs
Hi Artem, you are certainly correct in that James' points 2-9 would be moot if his point 1 were solved. But as long as this is not the case, we resort to work with few and/or small and/or badly diffracting and/or non-isomorphous crystals, which makes points 2-9 very relevant. Maybe the