Arabidopsis NPH3: A NPH1 photoreceptor-interacting protein essential for phototropism.
basic_science · Level V
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Abstract
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.
Medical subject headings
- Arabidopsis
- Arabidopsis Proteins
- Phosphoproteins
- Photoreceptor Cells, Invertebrate
- Plant Proteins