6s5d

Square conformation of KtrA R16A mutant ring with bound ATP

spinqualitylabelsall models 6s5d, resolution 3.39Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6s5d is a 2 chain structure with sequence from Bacillus subtilis subsp. subtilis str. 168. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.393Å Ligands: ATP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function KTRA_BACSU Catalytic subunit of the KtrAB potassium uptake transporter. The 2 major potassium transporter complexes KtrAB and KtrCD confer resistance to both suddenly imposed and prolonged osmotic stress. Publication Abstract from PubMed RCK domains regulate the activity of K(+) channels and transporters in eukaryotic and prokaryotic organisms by responding to ions or nucleotides. The mechanisms of RCK activation by Ca(2+) in the eukaryotic BK and bacterial MthK K(+) channels are well understood. However, the molecular details of activation in nucleotide-dependent RCK domains are not clear. Through a functional and structural analysis of the mechanism of ATP activation in KtrA, a RCK domain from the B. subtilis KtrAB cation channel, we have found that activation by nucleotide requires binding of cations to an intra-dimer interface site in the RCK dimer. In particular, divalent cations are coordinated by the gamma-phosphates of bound-ATP, tethering the two subunits and stabilizing the active state conformation. Strikingly, the binding site residues are highly conserved in many different nucleotide-dependent RCK domains, indicating that divalent cations are a general cofactor in the regulatory mechanism of many nucleotide-dependent RCK domains. Activation of a nucleotide-dependent RCK domain requires binding of a cation cofactor to a conserved site.,Teixeira-Duarte CM, Fonseca F, Morais Cabral JH Elife. 2019 Dec 23;8. pii: 50661. doi: 10.7554/eLife.50661. PMID:31868587 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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