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Complete Genome Structure of the Nitrogen-fixing Symbiotic Bacterium Mesorhizobium loti

Open access
Kaneko, T.·2000·DNA Research

Abstract

The complete nucleotide sequence of the genome of a symbiotic bacterium Mesorhizobium loti strain MAFF303099 was determined. The genome of M. loti consisted of a single chromosome (7,036,071 bp) and two plasmids, designated as pMLa (351,911 bp) and pMLb (208, 315 bp). The chromosome comprises 6752 potential protein-coding genes, two sets of rRNA genes and 50 tRNA genes representing 47 tRNA species. Fifty-four percent of the potential protein genes showed sequence similarity to genes of known function, 21% to hypothetical genes, and the remaining 25% had no apparent similarity to reported genes. A 611-kb DNA segment, a highly probable candidate of a symbiotic island, was identified, and 30 genes for nitrogen fixation and 24 genes for nodulation were assigned in this region. Codon usage analysis suggested that the symbiotic island as well as the plasmids originated and were transmitted from other genetic systems. The genomes of two plasmids, pMLa and pMLb, contained 320 and 209 potential protein-coding genes, respectively, for a variety of biological functions. These include genes for the ABC-transporter system, phosphate assimilation, two-component system, DNA replication and conjugation, but only one gene for nodulation was identified.

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Metadata

Authors
Kaneko, T.
Venue
DNA Research
Published
2000-01-01
Volume
7
Issue
6
Pages
331-338
ISSN
1340-2838 (ISSN-L)
OpenAlex
W2108508364
Cited by
837
References
19
FWCI
89.89
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Complete Genome Structure of the Nitrogen-fixing Symbiotic Bacterium Mesorhizobium loti. https://app.cochat.ai/papers/10.1093/dnares/7.6.331
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Kaneko, T. (2000). Complete Genome Structure of the Nitrogen-fixing Symbiotic Bacterium Mesorhizobium loti. DNA Research. https://doi.org/10.1093/dnares/7.6.331

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