Re: [ccp4bb] Element type N+1

2020-10-16 Thread Sam Tang
Hello, When I further refine my structure the N+1 is gone and it becomes a normal N again. So it is very much possible this is related to geometry. Thanks everyone (Esp. to Jon) for the input! Sam On Fri, 16 Oct 2020 at 19:31, Jon Cooper wrote: > Hello Sam > > thanks for the pictures. It

Re: [ccp4bb] Element type N+1

2020-10-16 Thread Jon Cooper
Hello Sam thanks for the pictures. It looks like the guanidinium group of the first Arg is not very planar. I don't know the detailed nuts-and-bolts of how Coot and Refmac handle this but the problem may arise from the initial geometry at the affected nitrogen being off-target. Best wishes,

Re: [ccp4bb] Element type N+1

2020-10-16 Thread Sam Tang
Dear all I attach herewith the Arg concerned. I actually saw no issue in Coot when I checked residue info. The issue was repeatable using both Refmac from Coot and from CCP4i. I rectified the issue simply by changing "N+1" back to "N" using a word editor, but would surely be glad to know more

Re: [ccp4bb] Element type N+1

2020-10-15 Thread Eleanor Dodson
Hmm - I have never seen anything like that - the monomer for ARG has no N+1 elements.. Garib? Rob? Eleanor On Thu, 15 Oct 2020 at 15:08, Sam Tang wrote: > Dear colleagues > > I am trying to refine a structure with Refmac and the work completes > without any warning. However I am a bit puzzled

Re: [ccp4bb] Element type N+1

2020-10-15 Thread Jon Cooper
Hello, can you possibly show us a couple of screenshots with atom labels of the affected side chain and a normal one? Best wishes, Jon Cooper. jon.b.coo...@protonmail.com Original Message On 15 Oct 2020, 15:07, Sam Tang wrote: > Dear colleagues > > I am trying to refine a