5cnx: Difference between revisions
No edit summary |
No edit summary |
||
| Line 10: | Line 10: | ||
== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/YPDF_ECOLI YPDF_ECOLI]] Hydrolyzes the N-terminal methionine when the next amino acid is alanine, proline or serine. The substrate preference for methionyl aminopeptidase activity is Pro > Ala > Ser. Also able to hydrolyze the Xaa-Pro peptide bond when the first amino acid is alanine, asparagine or methionine.<ref>PMID:15901689</ref> | [[http://www.uniprot.org/uniprot/YPDF_ECOLI YPDF_ECOLI]] Hydrolyzes the N-terminal methionine when the next amino acid is alanine, proline or serine. The substrate preference for methionyl aminopeptidase activity is Pro > Ala > Ser. Also able to hydrolyze the Xaa-Pro peptide bond when the first amino acid is alanine, asparagine or methionine.<ref>PMID:15901689</ref> | ||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
M24B peptidases cleaving Xaa-Pro bond in dipeptides are prolidases whereas those cleaving this bond in longer peptides are aminopeptidases-P. Bacteria have small aminopeptidases-P (36-39 kDa), which are diverged from canonical aminopeptidase-P of Escherichia coli (50 kDa). Structure-function studies of small aminopeptidases-P are lacking. We report crystal structures of small aminopeptidases-P from E. coli and Deinococcus radiodurans, and report substrate-specificities of these proteins and their ortholog from Mycobacterium tuberculosis. These are aminopeptidases-P, structurally close to small prolidases except for absence of dipeptide-selectivity loop. We noticed absence of this loop and conserved arginine in canonical archaeal prolidase (Maher et al., Biochemistry. 43, 2004, 2771-2783) and questioned its classification. Our enzymatic assays show that this enzyme is an aminopeptidase-P. Further, our mutagenesis studies illuminate importance of DXRY sequence motif in bacterial small aminopeptidases-P and suggest common evolutionary origin with human XPNPEP1/XPNPEP2. Our analyses reveal sequence/structural features distinguishing small aminopeptidases-P from other M24B peptidases. | |||
Structures and activities of widely conserved small prokaryotic aminopeptidases-P clarify classification of M24B peptidases.,Are VN, Kumar A, Goyal VD, Gotad SS, Ghosh B, Gadre R, Jamdar SN, Makde RD Proteins. 2018 Dec 11. doi: 10.1002/prot.25641. PMID:30536999<ref>PMID:30536999</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 5cnx" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||