Check out also this paper.
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Comput Biol Chem. 2008 Oct;32(5):370-4. Epub 2008 Jul 7.
Determination of helix orientations in proteins.
Tatulian SA.
Biomolecular Science Center, University of Central Florida, 12722
Research Parkway, Orlando, FL 32826, USA. statu...@mail.ucf.edu
Accurate description of helices, including curvature and bending, and
determination of interhelical angles are essential for analysis of
the three-dimensional fold and functionally important conformational
changes in helical proteins. Here, a new computational method is
presented that allows determination of angles between any helical
stretches, the radius of curvature of curved helices, bending angle
of bent helices, as well as symmetry relations within the protein
molecule, using main chain atom coordinates. The method has been
applied to describe changes in interhelical angles in calmodulin upon
interaction with a target peptide, which reveals the conformational
changes at a higher precision. Because subtle changes in helix-to-
helix packing and interhelical angles often underlie significant
functional transitions in proteins, this approach can serve as a
useful tool for characterization of such conformational changes at an
exceedingly high accuracy and thus provide detailed insight into the
structure-function relationship of proteins.
PMID: 18602867 [PubMed - indexed for MEDLINE]
On Apr 15, 2009, at 9:38 AM, peter hudson wrote:
Hello all
I am interested to know about any programme which can calculate the
angle between the helices of different subunit not the consecutive
helices. I know about helixang which is a ccp4 supported programme
but, i am not sure that does it calculate the relative angle
between the two helix of different subunit in different
orientation. Suggestiona would be appreciated.
Thnaks in advance
Peter
Young-Tae Lee, Ph. D.
Research Associate
David Goodin lab
Dept. of Molecular Biology
The Scripps Research Institute