Document Detail

Elucidation of the function of type 1 human methionine aminopeptidase during cell cycle progression.
MedLine Citation:
PMID:  17114291     Owner:  NLM     Status:  MEDLINE    
Processing of the N-terminal initiator methionine is an essential cellular process conserved from prokaryotes to eukaryotes. The enzymes that remove N-terminal methionine are known as methionine aminopeptidases (MetAPs). Human MetAP2 has been shown to be required for the proliferation of endothelial cells and angiogenesis. The physiological function of MetAP1, however, has remained elusive. In this report we demonstrate that a family of inhibitors with a core structure of pyridine-2-carboxylic acid previously developed for the bacterial and yeast MetAP1 is also specific for human MetAP1 (HsMetAP1), as confirmed by both enzymatic assay and high-resolution x-ray crystallography. Treatment of tumor cell lines with the MetAP1-specific inhibitors led to an accumulation of cells in the G(2)/M phase, suggesting that HsMetAP1 may play an important role in G(2)/M phase transition. Overexpression of HsMetAP1, but not HsMetAP2, conferred resistance of cells to the inhibitors, and the inhibitors caused retention of N-terminal methionine of a known MetAP substrate, suggesting that HsMetAP1 is the cellular target for the inhibitors. In addition, when HsMetAP1 was knocked down by gene-specific siRNA, cells exhibited slower progression during G(2)/M phase, a phenotype similar to cells treated with MetAP1 inhibitors. Importantly, MetAP1 inhibitors were able to induce apoptosis of leukemia cell lines, presumably as a consequence of their interference with the G(2)/M phase checkpoint. Together, these results suggest that MetAP1 plays an important role in G(2)/M phase of the cell cycle and that it may serve as a promising target for the discovery and development of new anticancer agents.
Xiaoyi Hu; Anthony Addlagatta; Jun Lu; Brian W Matthews; Jun O Liu
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2006-11-17
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  103     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2006 Nov 
Date Detail:
Created Date:  2006-11-29     Completed Date:  2007-01-19     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  18148-53     Citation Subset:  IM    
Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Data Bank Information
Bank Name/Acc. No.:
PDB/2NQ6;  2NQ7
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MeSH Terms
Aminopeptidases / antagonists & inhibitors,  chemistry,  metabolism*
Carboxylic Acids / chemistry,  pharmacology
Cell Cycle* / drug effects
Cell Line, Tumor
Crystallography, X-Ray
Enzyme Inhibitors / chemistry,  pharmacology
Gene Expression Regulation
Metalloendopeptidases / antagonists & inhibitors,  metabolism
Models, Molecular
Molecular Structure
Protein Binding
Protein Structure, Tertiary
Pyrimidines / chemistry
Reg. No./Substance:
0/Carboxylic Acids; 0/Enzyme Inhibitors; 0/Pyrimidines; 289-95-2/pyrimidine; EC 3.4.11.-/Aminopeptidases; EC 3.4.11.-/METAP1 protein, human; EC aminopeptidase 2; EC 3.4.24.-/Metalloendopeptidases

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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