High-frequency Spontaneous Mutation in the Bacterio-opsin Gene in Halobacterium Halobium is Mediated by Transposable Elements

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1983 Apr 1

PMID 6300900

Citations 48

Authors

S DasSarma

U L RajBhandary

H G Khorana

Affiliations

Soon will be listed here.

Abstract

We have recently characterized a transposable element, ISH1, which inactivates the bacterio-opsin (BO) gene in two purple membrane-deficient (Pum-) mutants of Halobacterium halobium. Examination of nine additional Pum- mutants now shows that in all of these the BO gene has been inactivated by insertion of one of two types of transposable elements. Four Pum- strains contain ISH1 within the BO gene, probably at the same site that we have previously characterized. A second element, ISH2, which is present in four more strains, inserts at multiple sites within the BO coding sequence. Significantly, another Pum- strain contains the ISH2 element 102 nucleotides upstream from the initiator codon for BO. ISH2, which is 520 nucleotides long, is the smallest insertion sequence known. Its sequence has been determined: it is A + T-rich (53%), contains a 19-base-pair inverted repeat at its termini, and, interestingly, duplicates either 10 or 20 base pairs at the target site during insertion. ISH2 is present in multiple copy numbers in the genome and contains several relatively short open reading frames.

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