6TC5 image
Entry Detail
PDB ID:
6TC5
Keywords:
Title:
Phytochromobilin-adducted PAS-GAF bidomain of Sorghum bicolor phyB
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2019-11-05
Release Date:
2020-05-06
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.22
R-Value Work:
0.19
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Phytochrome
Chain IDs:A (auth: AAA)
Chain Length:354
Number of Molecules:1
Biological Source:Sorghum bicolor
Primary Citation
Structural insights into photoactivation and signalling in plant phytochromes.
Nat.Plants 6 581 588 (2020)
PMID: 32366982 DOI: 10.1038/s41477-020-0638-y

Abstact

Plant phytochromes are red/far-red photochromic photoreceptors that act as master regulators of development, controlling the expression of thousands of genes. Here, we describe the crystal structures of four plant phytochrome sensory modules, three at about 2 Å resolution or better, including the first of an A-type phytochrome. Together with extensive spectral data, these structures provide detailed insight into the structure and function of plant phytochromes. In the Pr state, the substitution of phycocyanobilin and phytochromobilin cofactors has no structural effect, nor does the amino-terminal extension play a significant functional role. Our data suggest that the chromophore propionates and especially the phytochrome-specific domain tongue act differently in plant and prokaryotic phytochromes. We find that the photoproduct in period-ARNT-single-minded (PAS)-cGMP-specific phosphodiesterase-adenylyl cyclase-FhlA (GAF) bidomains might represent a novel intermediate between MetaRc and Pfr. We also discuss the possible role of a likely nuclear localization signal specific to and conserved in the phytochrome A lineage.

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