Apr 16, 2020

Autotransporters drive biofilm formation and auto-aggregation in the diderm Firmicute Veillonella parvula

BioRxiv : the Preprint Server for Biology
N. BechonChristophe Beloin


The Negativicutes are a clade of Firmicutes that have retained the ancestral diderm character and possess an outer membrane. One of the best studied Negativicute, Veillonella parvula, is an anaerobic commensal and opportunistic pathogen inhabiting complex human microbial communities, including the gut and the dental plaque microbiota. Whereas adhesion and biofilm capacity of V. parvula is expected to be crucial for its maintenance and development in these environments, studies of V. parvula adhesion have been hindered by the lack of efficient genetic tools to perform functional analyses in this bacterium. Here, we took advantage of a recently described naturally transformable V. parvula isolate, SKV38, and adapted tools developed for the closely related Clostridia spp. to perform random transposon and targeted mutagenesis to identify V. parvula genes involved in biofilm formation. We show that type V secreted autotransporters -typically found in diderm bacteria- are the main determinants of V. parvula auto-aggregation and biofilm formation, which compete with each other for binding either to cells or to surfaces, with strong consequences on V. parvula biofilm formation capacity. We also show that inactivation of the gene coding...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Small Nuclear RNA
RNA, Untranslated
MT-TA gene
Sperm Cell
Triplet Codon-amino Acid Adaptor Activity
Transfer RNA
Genetic Inheritance

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