Bacteriolytic Functions for Zinc Induced Peptidoglycan Inhibitive Biosynthesis and Activated Autolysins against S Aureus and E coli

Ishida T

Published on: 2022-05-17

Abstract

Zinc(?) induced disruption of bacterial peptidoglycan (PGN) biosynthesis and inhibition of PGN elongation occur that Zn²⁺ ions disrupt PGN biosynthesis TG/TP, causing bacterial lysis and that Zn²⁺ ions-mediated PGN activted autolysins destruct bacterioly-tically bacterial cell walls against S. aureus and E. coli, causing bacterial killing or promoting anti-bacterial activity.

For zinc-activated peptidoglycan(PGN) major autolysins against S. aureus, Zn induced autolysins of N-acetylglucosaminidase (AtlA) and N-acetyl-muramidase (AtlB and AtlC), in which AtlA (zinc metalloprotease, gelatinase, GelE), AtlB and AtlC are enhanced as PGN hydrolases to bacterial killing. Zn induced Amidase is that AmiA is PGN cleavage by a zinc-activated water molecule, AmiE with a buried zinc ion by Staphylococcal cell separation, Atl;Staphylococcal cell separation with the zinc metalloprotease, GelE, zinc metalloprotease dependent AtlA-mediated cell division for N-terminal cleavage, LytA;Litic amidase autolysin for zinc availability, and LytB;PGN hydrolase. Zn-induced Lytic amidase autolysin LytA which is released by bacterial lysis, associates with the cell wall via its zinc-binding motif. The LytB PGN hydrolase responsible for physical separation of daughter cells cleaves the GlcNAc-β-(1,4)-MurNAc glycosidic bond of PGN building units. The PGN-remodeling autolysins LytC, LytD, and LytF are expressed in the same subpopulation of cells and complete flagellar synthesis. In endopeptidase, D,L-Endopeptidase Zn LysM inhibit ShyA and ShyC.

The other, for zinc-activated PGN major autolysins against E. coli, in outer-membrane (OM) lipoprotein endopeptidase, zinc dependent endopeptidase at OM lipoprotein is involved that a murein endopeptidase with a hitherto unknown catalytic specificity that removes the PGN−Lpp cross-links suggesting a role for L,D-transpeptidase (Ldt) in the regulation of PGN–OM linkages to maintain the structural integrity of the bacterial cell envelope and that zinc-activated L,D-transpeptidase F (LdtF) or endopeptidase is enhanced to cleave OM lipoprotein. In N-acetylmuramidase and N-acetylglucosaminidase, zinc induced cell wall glycosidase (CWG) may be able to catalyse the hydrolysis of the glycosidic linkages. In zinc induced Amidase, AmiA, AmiB, AmiC and AmiD with Zn²⁺-metalloenzyme are elucidated structure that play an important role in cleaving the septum to release daughter cells after cell division and functional fusion proteins of AmiA or AmiC show different subcellular localization patterns in living cells. In peptidase, Zinc induced cell wall peptidase (CWP) proceeds cleavage of amide bonds between amino acids within the PGN chain. In Carboxy-peptidase, Zinc dependent carboxypeptidase hydrolyzes the peptide bond at the C-terminus of peptides and proteins from many organisms. Carboxypeptidase is a novel type of zinc-dependent metallo-carboxypeptidase, and the active site motif found in the enzyme provides us with a target for site-directed mutagenesis. This zinc-depedent carboxypeptidase autolysin could adapt to be appreciable the anti-bacterial activity.

Finally, the anti-bacterial zinc binding molecular mehanism is considered that Zn²⁺ ions-proteins complexes formations by Zn²⁺ ions-centered coordinated tetrahedrally molecular binding with biosynthetic protein, outer-membrane lipoprotein, and PGN autolytic proteins may be proceeded, resulting that Zn²⁺ induced disruption of PGN biosynthesis and activations of PGN major autolysins enhance anti-bacterial activity.