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. 1984 Aug;3(8):1717–1722. doi: 10.1002/j.1460-2075.1984.tb02037.x

Sequence analysis of the insertion element ISH1.8 and of associated structural changes in the genome of phage ΦH of the archaebacterium Halobacterium halobium

H Schnabel 1, P Palm 1, K Dick 1, B Grampp 1
PMCID: PMC557587  PMID: 16453543

Abstract

We have sequenced the insertion element ISH1.8 which can be present in one or two copies in the genome of phage ΦH of Halobacterium halobium. ISH1.8 is 1895 bp long, has no inverted repeat at its ends, and one only of the two copies is flanked by two 5-bp duplications. An 8-bp sequence composed of 4 bp from each end of ISH1.8 is present in both sites lacking the element. This 8-bp sequence could either be a specific insertion sequence or a part of the element that is left behind upon deletion. The plasmid pΦHL, consisting of the invertible L segment of the phage genome which is, in ΦH2 and ΦH5, flanked by two copies of ISH1.8, contains 112 bp of ISH1.8 and is released from the phage genome by recombination within a direct repeat of 9 bp. This 9-bp sequence (TCCCGCCCT) exists as an inverted repeat in ISH1.8 and therefore as two distinct repeats in phage genomes containing two copies of ISH1.8 in inverted orientation.

Keywords: archaebacteria, insertion element, phage ΦH variants, genome organization, Halobacterium halobium

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Selected References

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