A Second Endolysin Gene is Fully Embedded In-frame with the LysA Gene of Mycobacteriophage Ms6

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2011 Jun 23

PMID 21694774

Citations 22

Authors

Maria Joao Catalao

Catarina Milho

Filipa Gil

Jose Moniz-Pereira

Madalena Pimentel

Affiliations

Soon will be listed here.

Abstract

Mycobacteriophages are dsDNA viruses that infect mycobacterial hosts. The mycobacteriophage Ms6 accomplishes lysis by producing two cell wall hydrolytic enzymes, Lysin A (LysA) that possesses a central peptidoglycan recognition protein (PGRP) super-family conserved domain with the amidase catalytic site, that cleaves the amide bond between the N-acetylmuramic acid and L-alanine residues in the oligopeptide crosslinking chains of the peptidoglycan and Lysin B (LysB) a mycolylarabinogalactan esterase that hydrolyzes the mycolic acids from the mycolyl-arabinogalactan-peptidoglycan complex. Examination of the endolysin (lysA) DNA sequence revealed the existence of an embedded gene (lysA(241)) encoded in the same reading frame and preceded by a consensus ribosome-binding site. In the present work we show that, even though lysA is essential for Ms6 viability, phage mutants that express only the longer (Lysin(384)) or the shorter (Lysin(241)) endolysin are viable, but defective in the normal timing, progression and completion of host cell lysis. In addition, both endolysins have peptidoglycan hydrolase activity and demonstrated broad growth inhibition activity against various gram-positive bacteria and mycobacteria.

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