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Bacteriophage lysis: mechanism and regulation

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Ry Young·1992·Microbiological Reviews

Abstract

Bacteriophage lysis involves at least two fundamentally different strategies. Most phages elaborate at least two proteins, one of which is a murein hydrolase, or lysin, and the other is a membrane protein, which is given the designation holin in this review. The function of the holin is to create a lesion in the cytoplasmic membrane through which the murein hydrolase passes to gain access to the murein layer. This is necessary because phage-encoded lysins never have secretory signal sequences and are thus incapable of unassisted escape from the cytoplasm. The holins, whose prototype is the lambda S protein, share a common organization in terms of the arrangement of charged and hydrophobic residues, and they may all contain at least two transmembrane helical domains. The available evidence suggests that holins oligomerize to form nonspecific holes and that this hole-forming step is the regulated step in phage lysis. The correct scheduling of the lysis event is as much an essential feature of holin function as is the hole formation itself. In the second strategy of lysis, used by the small single-stranded DNA phage phi X174 and the single-stranded RNA phage MS2, no murein hydrolase activity is synthesized. Instead, there is a single species of small membrane protein, unlike the holins in primary structure, which somehow causes disruption of the envelope. These lysis proteins function by activation of cellular autolysins. A host locus is required for the lytic function of the phi X174 lysis gene E.

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OpenAlex · 10.1128/mmbr.56.3.430-481.1992

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Metadata

Authors
Young, R.
Venue
Microbiological Reviews
Publisher
American Society for Microbiology
Published
1992-01-01
Volume
56
Issue
3
Pages
430-481
ISSN
0146-0749 (ISSN-L)
OpenAlex
W1852844868
Cited by
773
References
94
FWCI
29.08
Type
journal article
Language
en
Open access
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CoChat. (2026). Citation check: Bacteriophage lysis: mechanism and regulation. https://app.cochat.ai/papers/10.1128/mmbr.56.3.430-481.1992
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Young, R. (1992). Bacteriophage lysis: mechanism and regulation. Microbiological Reviews. https://doi.org/10.1128/mmbr.56.3.430-481.1992

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