[phenixbb] tNCS
Huyton, Trevor
trevor.huyton at mpibpc.mpg.de
Tue Oct 25 02:41:04 PDT 2016
Dear All,
I have been struggling for while with a Molecular replacement problem for a large complex(3 proteins) with 2 copies per ASU.
I have a small but 100% model for one of the components but this contributes only 12% of ASU (2 molecules) a much poorer <20% model that contributes the majority 80% of the ASU
Space group is P222>P212121 best MR is in P21221.
I have strong tNCS as seen in native patterson and phaser chooses this top peak in MR runs:
There was 1 non-origin distinct peak (i.e. over 20% of origin peak and more than
15 angstroms from the origin)
Sorted by Height
----------------
Height Distance Vector
56.0% 126.4 : FRAC +0.5000 +0.5000 +0.3500 (ORTH 63.0 88.0 65.4)
Molrep also uses the same tNCS vector:
--- Check Patterson for pseudo-translation ---
PST_limit : 0.125 of origin peak
INFO: pseudo-translation was detected.
Origin Patterson peak: P,P/sig : 26479.002 239.412
1 Patterson peak : p,P/sig : 13591.399 122.888
2 Patterson peak : P,P/sig : 2506.590 22.664
3 Patterson peak : P,P/sig : 1517.345 13.719
Peak 1: trans.vector /ort/ : 62.995 88.023 65.691
trans.vector /frac/: 0.500 0.500 0.352
Peak 2: trans.vector /ort/ : 0.000 0.000 55.510
trans.vector /frac/: 0.000 0.000 0.297
Peak 3: trans.vector /ort/ : 58.238 88.023 65.730
trans.vector /frac/: 0.462 0.500 0.352
INFO: translation vector of peak 1 will be used.
My question is how does this affect my MR with the smaller component? Is it exactly the same vector as the larger component?
Thanks
Trevor
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