Jump to main content
Jump to site search

Issue 4, 2010
Previous Article Next Article

Amino acid transport in thermophiles: characterization of an arginine-binding protein in Thermotoga maritima. 2. Molecular organization and structural stability

Author affiliations

Abstract

ABC transport systems provide selective passage of metabolites across cell membranes and typically require the presence of a soluble binding protein with high specificity to a specific ligand. In addition to their primary role in nutrient gathering, the binding proteins associated with bacterial transport systems have been studied for their potential to serve as design scaffolds for the development of fluorescent protein biosensors. In this work, we used Fourier transform infrared spectroscopy and molecular dynamics simulations to investigate the physicochemical properties of a hyperthermophilic binding protein from Thermotoga maritima. We demonstrated preferential binding for the polar amino acid arginine and experimentally monitored the significant stabilization achieved upon binding of ligand to protein. The effect of temperature, pH, and detergent was also studied to provide a more complete picture of the protein dynamics. A protein structure model was obtained and molecular dynamic experiments were performed to investigate and couple the spectroscopic observations with specific secondary structural elements. The data determined the presence of a buried β-sheet providing significant stability to the protein under all conditions investigated. The specific amino acid residues responsible for arginine binding were also identified. Our data on dynamics and stability will contribute to our understanding of bacterial binding protein family members and their potential biotechnological applications.

Graphical abstract: Amino acid transport in thermophiles: characterization of an arginine-binding protein in Thermotoga maritima. 2. Molecular organization and structural stability

Back to tab navigation

Publication details

The article was received on 22 Oct 2009, accepted on 12 Jan 2010 and first published on 22 Feb 2010


Article type: Paper
DOI: 10.1039/B922092E
Citation: Mol. BioSyst., 2010,6, 687-698
  •   Request permissions

    Amino acid transport in thermophiles: characterization of an arginine-binding protein in Thermotoga maritima. 2. Molecular organization and structural stability

    A. Scirè, A. Marabotti, M. Staiano, L. Iozzino, M. S. Luchansky, B. S. Der, J. D. Dattelbaum, F. Tanfani and S. D'Auria, Mol. BioSyst., 2010, 6, 687
    DOI: 10.1039/B922092E

Search articles by author

Spotlight

Advertisements