Functional genomics of chitin degradation by Vibrio parahaemolyticus reveals finely integrated metabolic contributions to support environmental fitness.

IF 4 2区 生物学 Q1 GENETICS & HEREDITY
PLoS Genetics Pub Date : 2025-03-03 eCollection Date: 2025-03-01 DOI:10.1371/journal.pgen.1011370
Landon J Getz, Oriana S Robinson, Nikhil A Thomas
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引用次数: 0

Abstract

Vibrio species are marine prokaryotes that inhabit diverse ecological niches, colonizing abiotic and biotic surfaces. These bacteria are vital players in the global carbon cycle, assimilating billions of tonnes of chitin for carbon (and nitrogen) metabolites. Many bacterial proteins involved in the process-including chitinases, sugar transporters, and modifying enzymes-have been well studied. However, the genetic functional interplay and key drivers of Vibrio competitive survival in the presence of chitin as the dominant carbon source is not understood. To address this question, we carried out transposon sequencing (Tn-seq) to determine the genetic fitness of Vibrio parahaemolyticus mutants grown on chitin as a sole carbon source. Along with validating known Vibrio genes associated with chitin metabolism, our data newly identified vital roles for an unclassified OprD-like import chitoporin and a HexR family transcriptional regulator. Furthermore, we functionally implicated HexR in regulating multiple physiological processes involved in V. parahaemolyticus environmental survival including carbon assimilation and cell growth, biofilm formation, and cell motility. Under nutrient limiting conditions, our data revealed a requirement for HexR in filamentous cell morphology, a critical trait for V. parahaemolyticus environmental fitness. Therefore, a vital import porin and genomic regulation mediated by HexR support multiple physiological processes for Vibrio chitinolytic growth and environmental fitness.

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来源期刊
PLoS Genetics
PLoS Genetics GENETICS & HEREDITY-
自引率
2.20%
发文量
438
期刊介绍: PLOS Genetics is run by an international Editorial Board, headed by the Editors-in-Chief, Greg Barsh (HudsonAlpha Institute of Biotechnology, and Stanford University School of Medicine) and Greg Copenhaver (The University of North Carolina at Chapel Hill). Articles published in PLOS Genetics are archived in PubMed Central and cited in PubMed.
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