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. 1969 Jul;4(1):94–108. doi: 10.1128/jvi.4.1.94-108.1969

Effect of Host Cell Wall Material on the Adsorbability of Cofactor-requiring T4 1

Dennis T Brown 1,2, Thomas F Anderson 1
PMCID: PMC375841  PMID: 4897124

Abstract

The adsorbability of T4 on host cells was determined as a function of time after their liberation from infected cells. Freshly liberated (nascent) particles are readily adsorbed but lose their adsorbability with a half-time of about 2 days at 5 C, but only about 20 min at 37 C. They can be made adsorbable again with an α-amino acid cofactor like l-tryptophan, and this state of adsorbability can be stabilized by cell wall material from Escherichia coli. Such stabilized particles lose their adsorbability at a rate similar to that at which nascent particles lose theirs. Most freshly liberated particles are observed by means of electron microscopy to have “debris” attached to their baseplates and to have most of their six, long tail fibers free, whereas “old” particles that have lost their adsorbability appear relatively “clean” with most of their tail fibers wrapped around their sheaths. Nascent particles have densities that are lower than those of old particles. The material responsible for nascent adsorbability seems to be a fragment of the host's cell wall, for nascent adsorbability is destroyed by lysozyme. Furthermore, nascent T4 particles liberated from host cells with radioactively labeled walls carry the label in density gradients but lose it as they lose adsorbability. In addition, only a small proportion of particles liberated from infected spheroplasts are nascently adsorbable, whereas most particles liberated from intact cells are adsorbable.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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