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PMID:2187143

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Citation

Keck, W, van Leeuwen, AM, Huber, M and Goodell, EW (1990) Cloning and characterization of mepA, the structural gene of the penicillin-insensitive murein endopeptidase from Escherichia coli. Mol. Microbiol. 4:209-19

Abstract

The putative structural gene mepA of the penicillin-insensitive murein endopeptidase from Escherichia coli was cloned and sequenced. N-terminal sequence determination with the isolated endopeptidase protein showed that this enzyme is coded by the mepA gene and that it is synthesized initially with an N-terminal signal peptide. No significant sequence homology with the other (penicillin-sensitive) murein endopeptidase (dacB) or any other protein was found. The precise chromosomal mapping position of mepA relative to two other genes, aroC and fabB, was shown to be 50.4 min. E. coli strains carrying multicopy plasmids with the mepA gene produced 5-6-fold more endopeptidase and secreted it into the periplasm, where it appeared to function normally in vivo since the release of cell wall peptides into the medium increased in parallel. The transformed cells were, however, not unusually sensitive to penicillin and their murein had a normal degree of cross-bridges.

Links

PubMed

Keywords

Amino Acid Sequence; Base Sequence; Cloning, Molecular; Endopeptidases/genetics; Escherichia coli/enzymology; Escherichia coli/genetics; Escherichia coli Proteins; Gene Amplification; Genes, Bacterial; Molecular Sequence Data; Penicillin Resistance/genetics; Peptidoglycan/metabolism; Plasmids; Restriction Mapping; Transfection

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:MEPA

involved_in

GO:0000270: peptidoglycan metabolic process

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:MEPA

enables

GO:0004175: endopeptidase activity

ECO:0000315: mutant phenotype evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:MEPA

enables

GO:0008233: peptidase activity

ECO:0000315: mutant phenotype evidence used in manual assertion

F

Seeded From UniProt

complete


See also

References

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