1887

Abstract

Extracellular protein secretion is an essential feature in bacterial physiology. The ability to efficiently secrete diverse hydrolytic enzymes represents a key nutritional strategy for all bacteria, including micro-organisms living in extreme and hostile habitats, such as cold environments. However, little is known about protein secretion mechanisms in psychrophilic bacteria. In this study, the recombinant secretion of a cold-adapted -amylase in the Antarctic Gram-negative TAC125 was investigated. By a combination of several molecular techniques, the function of the gene was related to -amylase secretion in this psychrophilic bacterium. Deletion of the gene completely abolished amylase secretion without affecting the extracellular targeting of other substrates mediated by canonical secretion systems. The gene product, PssA, is a multidomain lipoprotein, predicted to be localized in the bacterial outer membrane, and displaying three TPR (tetratricopeptide repeat) domains and two LysM modules. Based on functional annotation of these domains, combined with the experimental results reported herein, we suggest a role for PssA as a molecular adaptor, in charge of recruiting other cellular components required for specific -amylase secretion. To the best of our knowledge, no proteins exhibiting the same domain organization have previously been linked to protein secretion.

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2010-01-01
2024-12-07
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