Arabidopsis NPH3: A NPH1 Photoreceptor-Interacting Protein Essential for Phototropism

作者：Andrei Motchoulski, Emmanuel Liscum · 发表于：Science · 年份：1999 · DOI：10.1126/science.286.5441.961 · 被引用次数：333 · 研究领域：Light effects on plants、Photosynthetic Processes and Mechanisms、Plant Molecular Biology Research

Phototropism of Arabidopsis thaliana seedlings in response to a blue light source is initiated by nonphototropic hypocotyl 1 (NPH1), a light-activated serine-threonine protein kinase. Mutations in three loci [NPH2, root phototropism 2 (RPT2), and NPH3] disrupt early signaling occurring downstream of the NPH1 photoreceptor. The NPH3 gene, now cloned, encodes a NPH1-interacting protein. NPH3 is a member of a large protein family, apparently specific to higher plants, and may function as an adapter or scaffold protein to bring together the enzymatic components of a NPH1-activated phosphorelay.