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I'd use NCS in the beginning and maybe also DM solvent flattening, then build and fix your structure, run refmac without NCS, superimpose your chains in Coot and re-define your strict NCS groups accordingly. Therafter you can submit your current coordinates to Ethan's TLSMD server and continue from there Jürgen ...................... Jürgen Bosch Johns Hopkins Bloomberg School of Public Health Department of Biochemistry & Molecular Biology Johns Hopkins Malaria Research Institute 615 North Wolfe Street, W8708 Baltimore, MD 21205 Phone: +1-410-614-4742 Lab: +1-410-614-4894 Fax: +1-410-955-3655 http://web.mac.com/bosch_lab/ On Mar 28, 2010, at 18:34, Daniel Bonsor <[log in to unmask]> wrote: > Hello again... > > I have a 2.7A resolution data set. Spacegroup P212121 as suggested > by Pointless and best space group when run through Phaser. Unit cell > is 110.02x160.49x186.55. Mathew's suggest 11 complexes in ASU. Both > Molrep and Phaser can only find 6. This seems to be a typical > observation with the complexes that we solve (high solvent content). > > Due to the low(ish) resolution I wish to apply TLS and NCS during > refinement. My question(s) is when to apply TLS and NCS, the order > in which it should be done, and when to switch off NCS (if at all) > during the stages of refinement. I have used a homologue complex > (Protein A -100% identical, Protein B - 80% identical) as a model. > > I am open to any and all suggestions on the matter. > > > Thanks in advance > > Dan