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Capo A, Natalello A, Marienhagen J, Pennacchio A, Camarca A, Di Giovanni S, Staiano M, D'Auria S, Varriale A. Structural features of the glutamate-binding protein from Corynebacterium glutamicum. Int J Biol Macromol 2020; 162:903-912. [PMID: 32593757 DOI: 10.1016/j.ijbiomac.2020.06.197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/05/2020] [Accepted: 06/21/2020] [Indexed: 10/24/2022]
Abstract
L-glutamate (Glu) is the major excitatory transmitter in mammalian brain. Inadequate concentration of Glu in the brain correlates to mood disorder. In industry, Glu is used as a flavour enhancer in food and in foodstuff processing. A high concentration of Glu has several effects on human health such as hypersensitive effects, headache and stomach pain. The presence of Glu in food can be detected by different analytical methods based on chromatography, or capillary electrophoresis or amperometric techniques. We have isolated and characterized a glutamate-binding protein (GluB) from the Gram-positive bacteria Corynebacterium glutamicum. Together with GluC protein, GluD protein and the cytoplasmic protein GluA, GluB permits the transport of Glu in/out of cell. In this study, we have investigated the binding features of GluB as well as the effect of temperature on its structure both in the absence and in the presence of Glu. The results have showed that GluB has a high affinity and selectivity versus Glu (nanomolar range) and the presence of the ligand induces a higher thermal stability of the protein structure.
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Affiliation(s)
- Alessandro Capo
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
| | - Antonino Natalello
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, P.zza della Scienza 2, 20126 Milano, Italy
| | - Jan Marienhagen
- Institute of Bio- and Geosciences, IBG-1: Biotechnology, Forschungszentrum Jülich, 52425 Jülich, Germany; Institute of Biotechnology, RWTH Aachen University, Worringer Weg 3, D-52074 Aachen, Germany
| | | | | | | | - Maria Staiano
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
| | - Sabato D'Auria
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy.
| | - Antonio Varriale
- Institute of Food Science CNR, via Roma 64, 83100 Avellino, Italy
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Einspahr H, Weiss MS, Hunter WN. Crystals on the cover 2014. Acta Crystallogr F Struct Biol Commun 2014. [PMCID: PMC3943087 DOI: 10.1107/s2053230x13034249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
The Editors highlight the crystals featured on the cover and a new series of articles.
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