[phenixbb] NCS interpretation

Peter Zwart PHZwart at lbl.gov
Thu Oct 25 01:49:43 PDT 2007

(x+9/69, y-28/79, z-46/90)

is a pseudo translation because the rotational part of the operator is 
the unity matrix. The only thing this guy does is move a subunit by


stumped means that I do not see what kind of operator it is...


Claudia Scotti wrote:
> Dear Peter,
> Thanks a lot for rebuilding the operators for me! In case you have still time for this:
> Please, how was it possible to deduce that (x+9/69, y-28/79, z-46/90) was a pseudo-translational symmetry operator? It infact correspond to the small peak in the Native Patterson (not considered signficant in any of the softwares I tried) I mentioned in my previous message.
> And, please, what's the meaning of "stumped"?
> You can make a sound laugh at these questions! :-)
> Thanks agaian,
> Claudia
> Claudia Scotti
> Dipartimento di Medicina Sperimentale
> Sezione di Patologia Generale
> Universita' di Pavia
> Piazza Botta, 10
> 27100 Pavia
> Italia
> Tel. 0039 0382 986335/8/1
> Facs 0039 0382 303673 ----------------------------------------> Date: Wed, 24 Oct 2007 21:17:59 -0700> From: PHZwart at lbl.gov> To: phenixbb at phenix-online.org> Subject: Re: [phenixbb] NCS interpretation>> Hi Claudia,>> You seem to have these operators:>> (x ,y,z)>> ( x-34/68, -y+13/79, -z +20/90) [ a 2 fold screw axis along a]>> ( -x +75/68, -y-26/79, z+9/90) [stumped]>> (-x+38/69, y-38/79, -z+24/90) [ two fold screw along b ]>> (x+9/69, y-28/79, z-46/90) [pseudo translational symmetry]>> (-x+57/69, y+10/79, -z+63/90) [stumped]>> (-x + 86/69 , -y + 6/79 , z - 48/90) [ two fold screw along c ]>> (x-53/69, -y-36/79, -z + 61/90 ) [stumped]>>> Are you sure that it is not P212121 with a pseudo tranlstaional> symmetry or two fold NCS parallel to one of the screws?>> In any case, P1 is bad news, because phenix.refine cannot handle more> then two twin domains. I suggest going to all flavours of P2 ( P112x,> P12x1, P2x11) if you are absolutely sure about the sg not being p222> or so.>> Did you run xtriage?>> Cheers>> Peter> _______________________________________________> phenixbb mailing list> phenixbb at phenix-online.org> http://www.phenix-online.org/mailman/listinfo/phenixbb
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