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The penicillin-binding proteins: structure and role in peptidoglycan biosynthesis

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TLDR
An overview of the content in PBPs of some bacteria is provided with an emphasis on comparing the biochemical properties of homologous PBPs (orthologues) belonging to different bacteria.
Abstract
Penicillin-binding proteins (PBPs) have been scrutinized for over 40 years. Recent structural information on PBPs together with the ongoing long-term biochemical experimental investigations, and results from more recent techniques such as protein localization by green fluorescent protein-fusion immunofluorescence or double-hybrid assay, have brought our understanding of the last stages of the peptidoglycan biosynthesis to an outstanding level that allows a broad outlook on the properties of these enzymes. Details are emerging regarding the interaction between the peptidoglycan-synthesizing PBPs and the peptidoglycan, their mesh net-like product that surrounds and protects bacteria. This review focuses on the detailed structure of PBPs and their implication in peptidoglycan synthesis, maturation and recycling. An overview of the content in PBPs of some bacteria is provided with an emphasis on comparing the biochemical properties of homologous PBPs (orthologues) belonging to different bacteria.

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Citations
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Journal ArticleDOI

Comparative genomics for mycobacterial peptidoglycan remodelling enzymes reveals extensive genetic multiplicity.

TL;DR: PG remodelling enzymes in a range of mycobacterial species are associated with extensive genetic multiplicity, suggesting functional diversification within these families of enzymes to allow organisms to adapt.
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The WalRK (YycFG) and σ(I) RsgI regulators cooperate to control CwlO and LytE expression in exponentially growing and stressed Bacillus subtilis cells.

TL;DR: It is proposed that this regulatory link between WalRK and σI RsgI expression ensures that the endopeptidase requirement (CwlO or LytE for cell viability is fulfilled during growth and under stress conditions.
Journal ArticleDOI

Cell-wall recycling and synthesis in Escherichia coli and Pseudomonas aeruginosa - their role in the development of resistance.

TL;DR: In this review, cell-wall synthesis and recycling in the various cellular compartments are compared and contrasted between E. coli and P. aeruginosa to spawn new ideas on how to effectively target cell- wall processes to combat the growing resistance to existing antibiotics.
Journal ArticleDOI

Protein complexes and proteolytic activation of the cell wall hydrolase RipA regulate septal resolution in mycobacteria.

TL;DR: It is demonstrated that dysregulation converts the essential mycobacterial peptidoglycan hydrolase RipA to an autolysin that compromises cellular structural integrity, and this picture is a part of a growing paradigm for careful control of cell wall hydrolysis by bacteria during growth.
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A peptidoglycan fragment triggers β-lactam resistance in Bacillus licheniformis.

TL;DR: A general model is proposed, in which the acylation of BlaR/MecR receptor and the cellular stress induced by the antibiotic are both necessary to generate a cell wall-derived coactivator responsible for the expression of an inducible β-lactam-resistance factor.
References
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Book

Handbook of proteolytic enzymes

TL;DR: In this paper, Serine Peptidases with a Ser/Lys Catalytic Dyad (SC) are described, as well as their relation to the Nodavirus Coat Protein.

The Handbook of proteolytic enzymes

TL;DR: (Abbreviated Contents Including Section Headings:)
Journal ArticleDOI

Peptidoglycan structure and architecture

TL;DR: In several species examined, the fine structure of the peptidoglycan significantly varies with the growth conditions, and the different models for the architecture are discussed with respect to structural and physical parameters.
Journal ArticleDOI

Growth of the Stress-Bearing and Shape-Maintaining Murein Sacculus of Escherichia coli

TL;DR: A model is presented that postulates that maintenance of bacterial shape is achieved by the enzyme complex copying the preexisting murein sacculus that plays the role of a template.
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