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. 1968 May;2(5):480–487. doi: 10.1128/jvi.2.5.480-487.1968

Chemically Induced Cofactor Requirement for Bacteriophage T4D 1

R I Gamow 1,2, L M Kozloff 1
PMCID: PMC375637  PMID: 5688400

Abstract

The treatment of bacteriophage T4D with 2-hydroxy-5-nitrobenzyl bromide, a specific reagent for alkylating the indole ring of tryptophan residues, converts these particles from a cofactor-independent form to a cofactor-sensitive form. These treated T4D particles phenotypically resemble T4B particles in certain respects. Their ability to form plaques on minimal medium plates is increased by the addition of l-tryptophan and is inhibited by the addition of indole. In liquid medium, their rate of adsorption is dependent on the presence of the cofactor l-tryptophan. l-Tryptophan-requiring phage have been produced by in vitro assembly of treated tail-fiberless particles of a T4D amber mutant plus untreated tail fiber preparation. When treated tail fibers were used with untreated tail-fiberless particles, the newly assembled particles did not require cofactor. A model of the tail structure of all the T-even bacteriophages is presented which postulates that the active configuration of the tail fibers requires that there be either (i) an endogenous tryptophan residue of the phage particle itself or (ii) an exogenously added l-tryptophan molecule complexed with a specific tryptophan receptor site, most likely on the phage base plate.

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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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