[ccp4bb] GLRF and interpreting self rotation functions...

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CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

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Date: 2009-04-01

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Subject: GLRF and interpreting self rotation functions...
From: Francis E Reyes Francis {- dot -} Reyes {- at -} COLORADO {- dot -} EDU
Date: 2009-04-01

I am experimenting with GLRF and am having trouble calculating the
locked self rotation function for a protein of known structure. The
protein has a 3 fold NCS axis that is not parallel to a
crystallographic axis. I'm at the step of specifying the local
symmetry elements for the locked self rotation function.

I guess the goal here is to search for 'one general rotation which
will bring the non crystallographic symmetry point group in a
"standard" orientation. What does this mean? How do I write the
LOCSymmetry instruction for the input file?

My s.g. is P 21 21 21 and the following solutions are found for the
normal self rotation function.

Fine searches around peaks with the slow rotation function --

The large-term cut-off is 1.50

Listing of the fitted angles of the top 5 peaks --

No. Old Angles S A N G L
E O A N G L E Old Ht. New Ht.
(polar,
XYK) (polar, XZK)
phi psi
kap phi psi kap

1 52.000 50.000 120.000 52.000 50.500
120.000 53.246 127.449 120.000 417.36 420.74
2 128.000 130.000 120.000 128.000 129.500
120.000 233.246 127.449 120.000 417.36 420.74
3 128.000 50.000 120.000 129.000 50.000
120.000 126.870 126.536 120.000 400.32 407.69
4 52.000 130.000 120.000 51.000 130.000
120.000 306.870 126.536 120.000 400.32 407.68
5 44.000 60.000 120.000 42.000 61.000
120.000 36.719 125.820 120.000 385.56 391.96

The goal of all this is to use GLRF to explore NCS in cases where
structures are not known and molecular replacement

Thanks

FR

---------------------------------------------
Francis Reyes M.Sc.
215 UCB
University of Colorado at Boulder

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CCP4bb navigation

CCP4bb <-- 1999 <-- November 1999 <-- 30 November 1999

Previous message:
Subject: Re: Eleven plausible phasing elements remain unused
From: Ethan Merritt merritt {- at -} U {- dot -} WASHINGTON {- dot -} EDU
Date: 2009-04-01

Next message:
Subject: Acrylamide in RNA crystallization
From: vanessa delfosse vanessa {- dot -} delfosse {- at -} GMAIL {- dot -} COM
Date: 2009-04-01