Switching from cut-and-paste to replicative Tn7 transposition

Earl W. May, Nancy L Craig

Research output: Contribution to journalArticle

Abstract

The bacterial transposon Tn7 usually moves through a cut-and-paste mechanism whereby the transposon is excised from a donor site and joined to a target site to form a simple insertion. The transposon was converted to a replicative element that generated plasmid fusions in vitro and cointegrate products in vivo. This switch was a consequence of the separation of 5'- and 3'-end processing reactions of Tn7 transposition as demonstrated by the consequences of a single amino acid alteration in an element-encoded protein essential for normal cut-and-paste transposition. The mutation specifically blocked cleavage of the 5' strand at each transposon end without disturbing the breakage and joining on the 3' strand, producing a fusion (the Shapiro Intermediate) that resulted in replicative transposition. The ability of Tn7 recombination products to serve as substrates for both the limited gap repair required to complete cut-and-paste transposition and the extensive DNA replication involved in cointegrate formation suggests a remarkable plasticity in Tn7's recruitment of host repair and replication functions.

Original languageEnglish (US)
Pages (from-to)401-404
Number of pages4
JournalScience
Volume272
Issue number5260
StatePublished - Apr 19 1996

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Ointments
DNA Replication
Genetic Recombination
Plasmids
Amino Acids
Mutation
Proteins

ASJC Scopus subject areas

  • General

Cite this

Switching from cut-and-paste to replicative Tn7 transposition. / May, Earl W.; Craig, Nancy L.

In: Science, Vol. 272, No. 5260, 19.04.1996, p. 401-404.

Research output: Contribution to journalArticle

May, Earl W. ; Craig, Nancy L. / Switching from cut-and-paste to replicative Tn7 transposition. In: Science. 1996 ; Vol. 272, No. 5260. pp. 401-404.
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