Maltose and maltodextrin utilization by Listeria monocytogenes depend on an inducible ABC transporter which is repressed by glucose

Shubha Gopal and Berg, D. and Hagen, N. and Schriefer, E. M. and Stoll, R. and Goebel, W. and Kreft, J. (2010) Maltose and maltodextrin utilization by Listeria monocytogenes depend on an inducible ABC transporter which is repressed by glucose. PloS one, 5 (4). e10349. ISSN 1932-6203

Text (Full Text) Mic_2010_Shubha Gopal.PDF - Published Version Download (382kB)

Abstract

Background: In the environment as well as in the vertebrate intestine, Listeriae have access to complex carbohydrates like maltodextrins. Bacterial exploitation of such compounds requires specific uptake and utilization systems. Methodology/Principal Findings: We could show that Listeria monocytogenes and other Listeria species contain genes/ gene products with high homology to the maltodextrin ABC transporter and utilization system of B. subtilis. Mutant construction and growth tests revealed that the L. monocytogenes gene cluster was required for the efficient utilization of maltodextrins as well as maltose. The gene for the ATP binding protein of the transporter was located distant from the cluster. Transcription analyses demonstrated that the system was induced by maltose/maltodextrins and repressed by glucose. Its induction was dependent on a LacI type transcriptional regulator. Repression by glucose was independent of the catabolite control protein CcpA, but was relieved in a mutant defective for Hpr kinase/phosphorylase. Conclusions/Significance: The data obtained show that in L. monocytogenes the uptake of maltodextrin and, in contrast to B. subtilis, also maltose is exclusively mediated by an ABC transporter. Furthermore, the results suggest that glucose repression of the uptake system possibly is by inducer exclusion, a mechanism not described so far in this organism.

Item Type:	Article
Subjects:	B Life Science > Microbiology
Divisions:	Department of > Microbiology
Depositing User:	Arshiya Kousar Library Assistant
Date Deposited:	04 Oct 2019 10:13
Last Modified:	04 Oct 2019 10:13
URI:	http://eprints.uni-mysore.ac.in/id/eprint/8715

Actions (login required)

View Item