Affiliation:
1. Department of Plant Biology, Carnegie Institution of Washington, 260 Panama Street, Stanford, CA 94305, USA.
Abstract
The
NPH1
(nonphototropic hypocotyl 1) gene encodes an essential component acting very early in the signal-transduction chain for phototropism.
Arabidopsis NPH1
contains a serine-threonine kinase domain and LOV1 and LOV2 repeats that share similarity (36 to 56 percent) with
Halobacterium salinarium
Bat,
Azotobacter vinelandii
NIFL,
Neurospora crassa
White Collar–1,
Escherichia coli
Aer, and the Eag family of potassium-channel proteins from
Drosophila
and mammals. Sequence similarity with a known (NIFL) and a suspected (Aer) flavoprotein suggests that NPH1 LOV1 and LOV2 may be flavin-binding domains that regulate kinase activity in response to blue light–induced redox changes.
Publisher
American Association for the Advancement of Science (AAAS)
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