On 2/2/13 12:18 AM, James Starlight wrote:
Justin,
I suppose that the ussage of the sub-set of trajectories is suitable
when you've already known possible salt-bridge pairs. But that time
I'd like to obtain that information from my trajectory.
E.g I have membrane-embedded protein which is the buddle of
alpha-helixes. I want to examine dynamics of the salt-bridges between
helixes first of all ( that interactions might serve as the
conformation locks ).
For such taks I've tried to use smaller -t distance with g_saltbr (e.g
considering dynamics of the residues within 1nm assuming both broken
and closed salt-bridges as well as taking into account that my protein
is membrane-bound where helixes are situated closely than in
water-soluble proteins) but again that produced many wrong pairs.
Defining "wrong" is a context-dependent assessment that can only be made after
the fact. You can also probably reduce the number of putative salt bridges by
using tpbconv -zeroq on various groups; there is a threshold within the g_saltbr
program for deciding (based on magnitude of charge) if a group is a putative
salt bridge participant.
Beyond that, accept the fact that g_saltbr is extremely unwieldy and
post-process accordingly.
-Justin
--
========================================
Justin A. Lemkul, Ph.D.
Research Scientist
Department of Biochemistry
Virginia Tech
Blacksburg, VA
jalemkul[at]vt.edu | (540) 231-9080
http://www.bevanlab.biochem.vt.edu/Pages/Personal/justin
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