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. 1983 Oct;48(1):18–30. doi: 10.1128/jvi.48.1.18-30.1983

In vivo cleavage of cytosine-containing bacteriophage T4 DNA to genetically distinct, discretely sized fragments.

K Carlson, J S Wiberg
PMCID: PMC255318  PMID: 6887350

Abstract

Mutants of bacteriophage T4D that are defective in genes 42 (dCMP hydroxymethylase), 46 (DNA exonuclease), and 56 (dCTPase) produce limited amounts of phage DNA in Escherichia coli B. In this DNA, glucoylated 5-hydroxymethylcytosine is completely replaced by cytosine. We found that this DNA rapidly becomes fragmented in vivo to at least 16 discrete bands as visualized on agarose gels subjected to electrophoresis. The sizes of the fragments ranged from more than 20 to less than 2 kilobase pairs. When DNAs from two of these bands were radioactively labeled in vitro by nick translation and hybridized to XbaI restriction fragments of cytosine-containing T4 DNA, evidence was obtained that the two bands are genetically distinct, i.e., they contain DNA from different parts of the T4 genome. Mutational inactivation of T4 endonuclease II (gene denA) prevented the fragmentation. Three different mutations in T4 endonuclease IV (gene denB) caused the same minor changes in the pattern of fragments. We conclude that T4 endonuclease II is required, and endonuclease IV is involved to a minor extent, in the in vivo production of these cytosine-containing T4 DNA fragments. We view these DNA fragments as "restriction fragments" since they represent degradation products of DNA "foreign" to T4, they are of discrete size, and they are genetically distinct. Thus, this report may represent the first, direct in vivo demonstration of discretely sized genetically distinct DNA restriction fragments.

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