Mechanism of signal transduction of the LOV2-Jα photosensor from Avena sativa.

Abstract:

:Fusion proteins containing blue-light-activable protein domains possess great potential as molecular switches in cell signalling. This has recently been impressively demonstrated by connecting the light oxygen voltage LOV2-Jα-protein domain of A. sativa (AsLOV2-Jα) with the Rac1-GTPase, responsible for regulating the morphology and motility of metazoan cells. However, a target-oriented development of fusion proteins in conjunction with this photosensor is still very challenging, because a detailed understanding of its signal transduction pathway on a molecular level is still lacking. Here, we show through molecular dynamics simulation that, after formation of the cysteinyl-flavin mononucleotide (FMN) adduct, the signalling pathway begins with a rotational reorientation of the residue glutamine 1029 adjacent to the FMN chromophore, transmitting stress through the Iβ strand towards the LOV2-Jα interface. This then results in the breakage of two H-bonds, namely, glutamic acid 1034-Gln995 and aspartic acid (Asp) 1056-Gln1013, at opposite sides of the interface between the Jα helix and the LOV2 domain, ultimately leading to a disruption of Jα helix from the LOV2 core.

journal_name

Nat Commun

journal_title

Nature communications

authors

Peter E,Dick B,Baeurle SA

doi

10.1038/ncomms1121

subject

Has Abstract

pub_date

2010-11-16 00:00:00

pages

122

issn

2041-1723

pii

ncomms1121

journal_volume

1

pub_type

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