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2017 ; 7
(1
): 1056
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Joint-based description of protein structure: its application to the geometric
characterization of membrane proteins
#MMPMID28432363
Thangappan J
; Wu S
; Lee SG
Sci Rep
2017[Apr]; 7
(1
): 1056
PMID28432363
show ga
A macroscopic description of a protein structure allows an understanding of the
protein conformations in a more simplistic manner. Here, a new macroscopic
approach that utilizes the joints of the protein secondary structures as a basic
descriptor for the protein structure is proposed and applied to study the
arrangement of secondary structures in helical membrane proteins. Two types of
dihedral angle, ? and ?, were defined based on the joint points of the
transmembrane (TM) helices and loops, and employed to analyze 103 non-homologous
membrane proteins with 3 to 14 TM helices. The ?-? plot, which is a distribution
plot of the dihedral angles of the joint points, identified the allowed and
disallowed regions of helical arrangement. Analyses of consecutive dihedral angle
patterns indicated that there are preferred patterns in the helical alignment and
extension of TM proteins, and helical extension pattern in TM proteins is varied
as the size of TM proteins increases. Finally, we could identify some symmetric
protein pairs in TM proteins under the joint-based coordinate and 3-dimensional
coordinates. The joint-based approach is expected to help better understand and
model the overall conformational features of complicated large-scale proteins,
such as membrane proteins.