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hi, Thanks for responses i got! I have already checked the data with sfcheck & truncate. there is no pseudosymmetry and twinning. for same protein we did the structure in low resolution. we didnt face any problem. cell parametres are 52.588 52.588 47.848 90.00 90.00 90.00 P43 I looking into other aspects peoples suggested me. regards prem --- Peter Zwart <[EMAIL PROTECTED]> wrote: > what is your cell and symmetry? > have you condisered twinning? > > > Prem kumar wrote: > > > Hi, > > > > I am refining atomic resolution (0.9 A) structure. > I am facing problem > > with R-factor 15.2 and R-free 18.5 even after > anisotropic refinement > > (including hydrogen), which is high for atomic > resolution data. the > > model seems to be fine and almost every residues > and water fitted well > > in electron density. i found few alternate > conformation and included > > them for refinement, but still R-factor is not > coming down. I tried > > different programs. shelx gives above said values. > refmac gives 17.3 > > and 19.5. I followed steps mentioned in manual. I > tried Arp/Warp too. > > Its able to build only 110 residues out of 121 > residues with R-factor > > 21.0 and R-free 23.4. > > data (synchrotron) was collected in two sets, one > for high resolution > > and one for low resolution. Rsym - 5.0(55.0), > I/sig I - 17.2(2.0), > > completness - 99.8(100). > > > > what are the ot! her factors I need to look into? > > Please suggest me how to proceed further. > > > > Thanks in advance! > > > > Regards > > R. Prem Kumar > > Research Scholar, Deptt. of Biophysics, AIIMS, New > Delhi. > > > > > > > ------------------------------------------------------------------------ > > Bring words and photos together (easily) with > > PhotoMail > > > <http://us.rd.yahoo.com/mail_us/taglines/PMHM3/*http://photomail.mail.yahoo.com> > > > - it's free and works with Yahoo! Mail. > > ------------------------------------------------------ ====================================================== R. Prem kumar Research Scholar, Department of Biophysics, All India Insitute of Medical Sciences(AIIMS), New Delhi-110029. INDIA Phone: +91-11-26593201,26588931 FAX : +91-11-26588663 ====================================================== __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
