Studying a cell division amidase using defined peptidoglycan substrates.
Studying a cell division amidase using defined peptidoglycan substrates.
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DOI:
10.1021/ja908916z
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发表时间:
2009-12-30
影响因子:
15
通讯作者:
Kahne, Daniel E.
中科院分区:
文献类型:
--
作者:
Lupoli, Tania J.;Taniguchi, Tohru;Wang, Tsung-Shing;Perlstein, Deborah L.;Walker, Suzanne;Kahne, Daniel E.
Three periplasmic N-acetylmuramoyl-L-alanine amidases are critical for hydrolysis of septal peptidoglycan, which enables cell separation. The amidases cleave the amide bond between the lactyl group of muramic acid and the amino group of L-alanine to release a peptide moiety. Cell division amidases remain largely uncharacterized because suitable substrates to study them have not been available. Here, we use synthetic peptidoglycan fragments of defined composition to characterize the catalytic activity and substrate specificity of the important E. coli cell division amidase, AmiA. We show that AmiA is a zinc metalloprotease that requires at least a tetrasaccharide glycopeptide substrate for cleavage. The approach outlined here can be applied to many other cell wall hydrolases and should enable more detailed studies of accessory proteins proposed to regulate amidase activity in cells.
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