2h34
Apoenzyme crystal structure of the tuberculosis serine/threonine kinase, PknEApoenzyme crystal structure of the tuberculosis serine/threonine kinase, PknE
Structural highlights
FunctionPKNE_MYCTU Important for survival of the bacterium in the host during infection. Promotes the survival of infected macrophages by activating multiple signaling responses and suppressing apoptosis of macrophages during nitrate stress. May contribute to the adaptation of M.tuberculosis during stress conditions by maintaining the cellular integrity. Can phosphorylate the FHA domain of Rv1747.[1] [2] [3] [4] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe "eukaryotic-like" receptor Ser/Thr protein kinases (STPKs) are candidates for the sensors that mediate environmental adaptations of Mycobacterium tuberculosis (Mtb). To define the mechanisms of regulation and substrate recognition, we determined the crystal structure of the ligand-free, activated kinase domain (KD) of the Mtb STPK, PknE. Remarkably, the PknE KD formed a dimer similar to that first observed in the structure of the ATPgammaS complex of the Mtb paralog, PknB. This structural similarity, which occurs despite little sequence conservation between the PknB and PknE dimer interfaces, supports the idea that dimerization regulates the Mtb receptor STPKs. Insertion of the DFG motif into the ATP-binding site and other conformational differences compared the ATPgammaS:PknB complex suggest that apo-PknE is not pre-organized to bind nucleotides. This structure may represent an inactive conformation stabilized by dimerization or, alternatively, an active conformation that reveals shifts that mediate nucleotide exchange and order substrate binding. A conserved dimer and global conformational changes in the structure of apo-PknE Ser/Thr protein kinase from Mycobacterium tuberculosis.,Gay LM, Ng HL, Alber T J Mol Biol. 2006 Jul 7;360(2):409-20. Epub 2006 May 19. PMID:16762364[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
|
| ||||||||||||||||||