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PeerJ. 2017 Apr 19;5:e3162. doi: 10.7717/peerj.3162. eCollection 2017.

The genomic sequence of Exiguobacterium chiriqhucha str. N139 reveals a species that thrives in cold waters and extreme environmental conditions.

Author information

1
Unidad de Genética Evolutiva, Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universidad de Valencia, Calle Catedrático José Beltrán Martínez, Paterna, Valencia, Spain.
2
Current affiliation:  Ecologie Systématique Evolution, CNRS, AgroParisTech, Université Paris Sud (Paris XI), Orsay, France.
3
Laboratorio de Investigaciones Microbiológicas de Lagunas Andinas, Planta Piloto de Procesos Industriales Microbiológicos (PROIMI), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Belgrano y Pasaje Caseros, San Miguel de Tucumán, Argentina.
4
Current affiliation:  Department of Entomology, Hebrew University of Jerusalem, Rehovot, Israel.
5
Carrera de Biología, Faculta de Estudios Superiores Zaragoza, UNAM, Mexico City, Mexico.
6
Departamento de Ecología Evolutiva, Instituto de Ecología, Universidad Nacional Autónoma de México coyoacan, Mexico City, México.
7
Department of Biology, James Madison University, Harrisonburg, VI, United States of America.
8
Laboratorio Nacional de Microscopía Avanzada, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México.
9
Departamento de Microbiología Molecular, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos, México.
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Contributed equally

Abstract

We report the genome sequence of Exiguobacterium chiriqhucha str. N139, isolated from a high-altitude Andean lake. Comparative genomic analyses of the Exiguobacterium genomes available suggest that our strain belongs to the same species as the previously reported E. pavilionensis str. RW-2 and Exiguobacterium str. GIC 31. We describe this species and propose the chiriqhucha name to group them. 'Chiri qhucha' in Quechua means 'cold lake', which is a common origin of these three cosmopolitan Exiguobacteria. The 2,952,588-bp E. chiriqhucha str. N139 genome contains one chromosome and three megaplasmids. The genome analysis of the Andean strain suggests the presence of enzymes that confer E. chiriqhucha str. N139 the ability to grow under multiple environmental extreme conditions, including high concentrations of different metals, high ultraviolet B radiation, scavenging for phosphorous and coping with high salinity. Moreover, the regulation of its tryptophan biosynthesis suggests that novel pathways remain to be discovered, and that these pathways might be fundamental in the amino acid metabolism of the microbial community from Laguna Negra, Argentina.

KEYWORDS:

Arsenic resistance; Bacterial metabolism; Exiguobacterium; Extremophiles; High altitude Andean lakes; Metals or metalloids; Tryptophan biosynthesis; UV resistance

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