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New type of antimicrobial protein produced by the plant pathogen Clavibacter michiganensis subsp. michiganensis.


ABSTRACT: It has previously been shown that the tomato pathogen Clavibacter michiganensis subsp. michiganensis secretes a 14-kDa protein, C. michiganensis subsp. michiganensis AMP-I (CmmAMP-I), that inhibits growth of Clavibacter michiganensis subsp. sepedonicus, the causal agent of bacterial ring rot of potato. Using sequences obtained from tryptic fragments, we have identified the gene encoding CmmAMP-I and we have recombinantly produced the protein with an N-terminal intein tag. The gene sequence showed that CmmAMP-I contains a typical N-terminal signal peptide for Sec-dependent secretion. The recombinant protein was highly active, with 50% growth inhibition (IC50) of approximately 10 pmol, but was not toxic to potato leaves or tubers. CmmAMP-I does not resemble any known protein and thus represents a completely new type of bacteriocin. Due to its high antimicrobial activity and its very narrow inhibitory spectrum, CmmAMP-1 may be of interest in combating potato ring rot disease.

SUBMITTER: Liu Z 

PROVIDER: S-EPMC3754172 | biostudies-literature | 2013 Sep

REPOSITORIES: biostudies-literature

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New type of antimicrobial protein produced by the plant pathogen Clavibacter michiganensis subsp. michiganensis.

Liu Zhanliang Z   Ma Ping P   Holtsmark Ingrid I   Skaugen Morten M   Eijsink Vincent G H VG   Brurberg May B MB  

Applied and environmental microbiology 20130712 18


It has previously been shown that the tomato pathogen Clavibacter michiganensis subsp. michiganensis secretes a 14-kDa protein, C. michiganensis subsp. michiganensis AMP-I (CmmAMP-I), that inhibits growth of Clavibacter michiganensis subsp. sepedonicus, the causal agent of bacterial ring rot of potato. Using sequences obtained from tryptic fragments, we have identified the gene encoding CmmAMP-I and we have recombinantly produced the protein with an N-terminal intein tag. The gene sequence showe  ...[more]

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