A TonB-dependent Receptor Constitutes The outer Membrane Transport System for a Lignin-derived Aromatic Compound

Overview

Journal Commun Biol

Specialty Biology

Date 2019 Dec 5

PMID 31799434

Citations 24

Authors

Masaya Fujita

Kosuke Mori

Hirofumi Hara

Shojiro Hishiyama

Naofumi Kamimura

Eiji Masai

Affiliations

Soon will be listed here.

Abstract

TonB-dependent receptors (TBDRs) mediate substrate-specific transport across the outer membrane, utilizing energy derived from the proton motive force transmitted from the TonB-ExbB-ExbD complex located in the inner membrane (TonB system). Although a number of TonB systems involved in the uptake of siderophores, vitamin B12 and saccharides have been identified, their involvement in the uptake and catabolism of aromatic compounds was previously unknown. Here, we show that the outer membrane transport of a biphenyl compound derived from lignin is mediated by the TonB system in a Gram-negative bacterium capable of degrading lignin-derived aromatic compounds, sp. strain SYK-6. Furthermore, we found that overexpression of the corresponding TBDR gene enhanced the uptake of this biphenyl compound, contributing to the improved rate of platform chemical production. Our results will provide an important basis for establishing engineered strains optimized for use in lignin valorisation.

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