The Pelagic Bacterium Paraphotobacterium marinum Has the Smallest Complete Genome Within the Family Vibrionaceae

Frontiers in Microbiology
Zhaobin HuangZongze Shao

Abstract

Members of the family Vibrionaceae are metabolically versatile and ubiquitous in natural environments, with extraordinary genome feature of two chromosomes. Here we reported the complete genome of Paraphotobacterium marinum NSCS20N07D(T), a recently described novel genus-level species in the family Vibrionaceae. It contained two circular chromosomes with a size of 2,593,992 bp with G+C content of 31.2 mol%, and a plasmid with a size of 5,539 bp. The larger chromosome (Chr. I) had a genome size of 1,426,504 bp with G+C content of 31.6 mol%, and the smaller one (Chr. II) had a genome size of 1,161,949 bp with G+C content of 30.8 mol%. The two chromosomes have strikingly similar G+C contents with difference of <1% and similar percentages of coding regions. Interestingly, by comparison to 134 species affiliated with seven genera within the family Vibrionaceae, P. marinum NSCS20N07D(T) possessed the smallest genome size and lowest G+C content. Clusters of orthologous groups of proteins functional categories revealed that the two chromosomes had different distributions of functional classes, indicating they take different cellular functions. Surprisingly, Chr. II had a large proportion of unknown genes than Chr. I. Metabolic characte...Continue Reading

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Datasets Mentioned

BETA
KU140414
KC668602
GU061981
KF786461
CP022355
CP022357

Methods Mentioned

BETA
electrophoresis
PCR
transmission electron microscopy

Software Mentioned

Nucleotide BLAST
BLASTN
MicroScope
Miseq
Circos
tRNAscan
RAST
mothur
Qiime
BLASTP

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