Ion channels of glutamate receptors: structural modeling.

Abstract:

:Ionotropic glutamate receptors belong to the superfamily of P-loop channels as well as K(+), Na(+), and Ca(2+) channels. However, the structural similarity between ion channels of the glutamate receptors and K(+) channels is a matter of discussion. The aim of this study was to analyze differences between the structures of K(+) channels and glutamate receptor channels. For this purpose, homology models of NMDA and AMPA receptor channels (M2 and M3 segments) were built using X-ray structures of K(+) channels as templates. The models were optimized and used to reproduce specific data on the structure of glutamate receptor channels. Particular attention was paid to the data of the binding of channel blockers and to the results of scanning mutagenesis. The modeling demonstrates that properties of glutamate receptor channel can be reproduced assuming only local structural deformations of the K(+) channel templates. The most valuable differences were found in the selectivity-filter region, whereas helical parts of M2 and M3 segments could have similar spatial organization with homologous segments in K(+) channels. It is concluded that the current experimental data on glutamate receptor channels does not reveal global structural differences with K(+) channels.

journal_name

Mol Membr Biol

authors

Tikhonov DB

doi

10.1080/09687860601008806

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

135-47

issue

2

eissn

0968-7688

issn

1464-5203

pii

777464127

journal_volume

24

pub_type

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