Characterization of a Novel Porin-Like Protein, ExtI, from Geobacter sulfurreducens and Its Implication in the Reduction of Selenite and Tellurite.

Author(s) Jahan, M.Ishrat; Tobe, R.; Mihara, H.
Journal Int J Mol Sci
Date Published 2018 Mar 11
Abstract

The gene in encodes a putative outer membrane channel porin, which resides within a cluster of genes. This cluster is highly conserved across the and includes multiple putative -type cytochromes. In silico analyses of the ExtI sequence, together with Western blot analysis and proteinase protection assays, showed that it is an outer membrane protein. The expression level of ExtI did not respond to changes in osmolality and phosphate starvation. An -deficient mutant did not show any significant impact on fumarate or Fe(III) citrate reduction or sensitivity to β-lactam antibiotics, as compared with those of the wild-type strain. However, deficiency resulted in a decreased ability to reduce selenite and tellurite. Heme staining analysis revealed that deficiency affects certain heme-containing proteins in the outer and inner membranes, which may cause a decrease in the ability to reduce selenite and tellurite. Based on these observations, we discuss possible roles for ExtI in selenite and tellurite reduction in .

DOI 10.3390/ijms19030809
Keywords Bacterial Proteins; Ferric Compounds; Fumarates; Geobacter; Oxidation-Reduction; Porins; Selenious Acid; Tellurium
ISSN 1422-0067
Citation Jahan MI, Tobe R, Mihara H. Characterization of a Novel Porin-Like Protein, ExtI, from Geobacter sulfurreducens and Its Implication in the Reduction of Selenite and Tellurite. Int J Mol Sci. 2018;19(3).

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