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Nucleotide sequence of diatom plasmids: identification of open reading frames with similarity to site-specific recombinases.

Abstract：

:We have determined the nucleotide sequence of two small circular DNA plasmids, pCf1 and pCf2 [22], from the marine diatom Cylindrotheca fusiformis. pCf1 is 4273 bp, and pCf2 is 4079 bp in size. In each plasmid, all of the major open reading frames (ORFs) are encoded on the same DNA strand. Two ORFs are similar, comparing the two plasmids. ORF218 (pCf1) and ORF217 (pCf2) share 80% amino acid identity and ORF482 (pCf1) and ORF484 (pCf2) share 54% amino acid identity. ORF218/217 shows significant similarity (28-31% amino acid identity) to the Tn3 class of resolvases. Resolvases are most commonly found in bacterial transposons. However, two other features found in the Tn3 class of transposon are missing in the plasmids; an ORF encoding a transposase and terminal inverted repeat sequences. This, and data mapping the portions of the plasmids that hybridize to genomic chloroplast DNA, suggest that the plasmids do not contain active transposons. By analogy with the R46 plasmid from Enterobacter [5, 6], another potential role for the resolvases encoded by pCf1 and pCf2 is the conversion of multimeric forms of the plasmid to monomers. The similarity of ORF218/217 to resolvases documents the first identification of a potential coding function in an algal plasmid.

journal_name

Plant Mol Biol

journal_title

Plant molecular biology

authors

Hildebrand M,Hasegawa P,Ord RW,Thorpe VS,Glass CA,Volcani BE

doi

10.1007/BF00027072

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

759-70

issue

5

eissn

0167-4412

issn

1573-5028

journal_volume

19

pub_type

杂志文章

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