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.
journal_name
Proc Natl Acad Sci U S Aauthors
DasSarma S,RajBhandary UL,Khorana HGdoi
10.1073/pnas.80.8.2201subject
Has Abstractpub_date
1983-04-01 00:00:00pages
2201-5issue
8eissn
0027-8424issn
1091-6490journal_volume
80pub_type
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更新日期:2008-01-08 00:00:00
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更新日期:2019-06-11 00:00:00
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更新日期:2005-06-14 00:00:00
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更新日期:2007-05-22 00:00:00
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更新日期:2006-03-14 00:00:00
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journal_title:Proceedings of the National Academy of Sciences of the United States of America
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更新日期:2008-09-23 00:00:00
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更新日期:2012-04-17 00:00:00