2jrc
Solution structure of Peptidyl-tRNA Hydrolase from Mycobacterium tuberculosis H37Rv.
Structural highlights
FunctionPTH_MYCTU The natural substrate for this enzyme may be peptidyl-tRNAs which drop off the ribosome during protein synthesis (By similarity). 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 PubMedEubacterial peptidyl-tRNA hydrolase is an essential enzyme that hydrolyzes peptidyl-tRNAs that are released into the cytoplasm because of premature termination of translation, expression of minigenes, and action of lincosamide and macrolide antibiotics. This averts the arrest of protein synthesis caused by depletion of free tRNA. Recently, we demonstrated that Mycobacterium tuberculosis peptidyl-tRNA hydrolase (MtPth) is present in the cytosol of mycobacterium and is capable of hydrolyzing peptidyl-tRNA. Here, we present the solution structure of MtPth, which is the first solution structure for this family of proteins. MtPth typically consists of seven-stranded mixed beta-sheet surrounded by six alpha-helices. The backbone dynamics for this enzyme were probed by measuring (15)N relaxation parameters and these were analyzed with model-free formalism and reduced spectral density mapping analysis. Overall, the protein molecule has tau(m) of 9.67+/-0.02 ns. The (15)N relaxation data analysis reveals that while majority of the protein backbone is rigid to motions, a short segment consisting of enzymatically critical residue H22, the loop-helix cover over the active site crevice, and the C-terminal helical hairpin exhibit motions on the milli-to microsecond timescale, all of which are linked to interaction with the substrate peptidyl-tRNA. Solution structure and dynamics of peptidyl-tRNA hydrolase from Mycobacterium tuberculosis H37Rv.,Pulavarti SV, Jain A, Pathak PP, Mahmood A, Arora A J Mol Biol. 2008 Apr 18;378(1):165-77. Epub 2008 Feb 21. PMID:18342886[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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