6fh1
From Proteopedia
Protein arginine kinase McsB in the apo state
Structural highlights
Function[MCSB_GEOSE] Catalyzes the specific phosphorylation of arginine residues in a large number of proteins. Is part of the bacterial stress response system, where it is involved in regulating the global heat shock repressor CtsR; phosphorylates arginine residues in the winged helix-turn-helix domain of CtsR, thereby preventing its binding to DNA and consequently inducing the expression of repressed genes. Protein arginine phosphorylation has a physiologically important role and is involved in the regulation of many critical cellular processes, such as protein homeostasis, motility, competence, and stringent and stress responses, by regulating gene expression and protein activity. Acts exclusively on Arg residues, since it cannot phosphorylate Tyr, Ser, Thr, His, Asp and Lys.[1] Publication Abstract from PubMedProtein phosphorylation regulates key processes in all organisms. In Gram-positive bacteria, protein arginine phosphorylation plays a central role in protein quality control by regulating transcription factors and marking aberrant proteins for degradation. Here, we report structural, biochemical, and in vivo data of the responsible kinase, McsB, the founding member of an arginine-specific class of protein kinases. McsB differs in structure and mechanism from protein kinases that act on serine, threonine, and tyrosine residues and instead has a catalytic domain related to that of phosphagen kinases (PhKs), metabolic enzymes that phosphorylate small guanidino compounds. In McsB, the PhK-like phosphotransferase domain is structurally adapted to target protein substrates and is accompanied by a novel phosphoarginine (pArg)-binding domain that allosterically controls protein kinase activity. The identification of distinct pArg reader domains in this study points to a remarkably complex signaling system, thus challenging simplistic views of bacterial protein phosphorylation. Structure of McsB, a protein kinase for regulated arginine phosphorylation.,Suskiewicz MJ, Hajdusits B, Beveridge R, Heuck A, Vu LD, Kurzbauer R, Hauer K, Thoeny V, Rumpel K, Mechtler K, Meinhart A, Clausen T Nat Chem Biol. 2019 Apr 8. pii: 10.1038/s41589-019-0265-y. doi:, 10.1038/s41589-019-0265-y. PMID:30962626[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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