🔬 Holin

A protein produced especially by tailed phages that controls the timing of phage-infection lysis.

by Stephen T. Abedon Ph.D. Steve Abedon, Ph.D., has taught well over 100 individual classes and ~10 individual courses (including introductory biology, microbiology, physiology, biochemistry, etc.) over his 30+ years as a college professor. He has over 150 publications, including multiple monographs, and is ranked in the top 1 or 2 percent among researchers of all disciplines worldwide. His research focuses on bacteriophage biology and phage therapy. (abedon.1@osu.edu)

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About this entry: Holin is one of a growing set of phage biology and phage therapy terms defined here. For more phage terms, see Abedon, S.T. (2025). Phage Therapy Annotated Glossary. Preprints.org. 10.20944/preprints202508.0347.v1
To share a particular section, use the 🔗 link beside its heading, which copies a web address that opens the page right there. To cite this page: Abedon, S.T. (2026). Phage Terms. terms.phage.org.  ·  DOI: 10.5281/zenodo.20173633

phage.org/terms/holin.html  ·  Abedon’s Books  ·  DOI: 10.5281/zenodo.20173633

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Holin: A protein produced especially by tailed phages that controls the timing of phage-infection lysis.

Discussion

Holins are intimately involved in determining infection latent period length and mechanistically are responsible for allowing phage-produced endolysin to degrade the bacterial cell wall.

Holins are named after an ability to form "holes" in bacterial plasma membranes, thereby allowing endolysin to translocate from within the bacterial cytoplasm, where endolysin is produced, to the bacterial cell wall. Not all holins, however, function in precisely this manner.

Numerous reviews of holin function have been authored by Ry Young including Young (1992), Young and Bläsi (1995), Young (2005), and Young and Wang (2006).

References

  • Young, R. (1992). Bacteriophage lysis: mechanisms and regulation. Microbiological Reviews 56:430–481. PubMed
  • Young, R. & Bläsi, U. (1995). Holins: form and function in bacteriophage lysis. FEMS Microbiology Reviews 17:191–205. PubMed
  • Young, R. (2005). Phage lysis. In: Waldor, M.K., Friedman, D.I. & Adhya, S.L. (eds.) Phages: Their Role in Bacterial Pathogenesis and Biotechnology. ASM Press, Washington, DC, pp. 92–127.
  • Young, R. & Wang, I.-N. (2006). Phage lysis. In: Calendar, R. & Abedon, S.T. (eds.) The Bacteriophages. 2nd ed. Oxford University Press, Oxford, pp. 104–125.

How to cite this page

Abedon, S.T. (2026). Phage Terms. https://terms.phage.org  ·  10.5281/zenodo.20173633

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