5iu1 | pdb_00005iu1

N-terminal PAS domain homodimer of PpANR MAP3K from Physcomitrella patens.

spinqualitylabelsall models 5iu1, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5iu1 is a 2 chain structure with sequence from Physcomitrium patens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.7Å Ligands: GOL, PEG, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0S1VWZ1_PHYPA Publication Abstract from PubMed The anatomically simple plants that first colonised land must have acquired molecular and biochemical adaptations to drought stress. Abscisic acid (ABA) coordinates responses leading to desiccation tolerance in all land plants. We identified ABA non-responsive mutants in the model bryophyte Physcomitrella patens and genotyped a segregating population to map and identify the ABA NON-RESPONSIVE (ANR) gene encoding a modular protein kinase comprising an N-terminal PAS domain, a central EDR domain and a C-terminal MAPKKK-like domain. anr mutants fail to accumulate dehydration tolerance-associated gene products in response to drought, ABA or osmotic stress, and do not acquire ABA-dependent desiccation tolerance. The crystal structure of the PAS domain, determined to 1.7A resolution, shows a conserved PAS-fold that dimerises through a weak dimerization interface. Targeted mutagenesis of a conserved tryptophan residue within the PAS domain generates plants with ABA non-responsive growth and strongly attenuated ABA-responsive gene expression, whereas deleting this domain retains a fully ABA-responsive phenotype. ANR orthologs are found in early-diverging land plant lineages and aquatic algae, but are absent from more recently diverged vascular plants. We propose that ANR genes represent an ancestral adaptation that enabled drought-stress survival of the first terrestrial colonisers, but were lost during land plant evolution. Genetic analysis of Physcomitrella patens identifies ABSCISIC ACID NON-RESPONSIVE (ANR), a regulator of ABA responses unique to basal land plants and required for desiccation tolerance.,Stevenson SR, Kamisugi Y, Trinh CH, Schmutz J, Jenkins JW, Grimwood J, Muchero W, Tuskan GA, Rensing SA, Lang D, Reski R, Melkonian M, Rothfels CJ, Li FW, Larsson A, Wong GK, Edwards TA, Cuming AC Plant Cell. 2016 May 18. pii: tpc.00091.2016. PMID:27194706 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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