Download MendeleyMolecular analysis of cyclic alpha-maltosyl-(1→6)-maltose binding protein in the bacterial metabolic pathway.
Kohno, M., Arakawa, T., Sunagawa, N., Mori, T., Igarashi, K., Nishimoto, T., Fushinobu, S.(2020) PLoS One 15: e0241912-e0241912
- PubMed: 33211750
- DOI: https://doi.org/10.1371/journal.pone.0241912
- Primary Citation of Related Structures:
7BVT - PubMed Abstract:
Cyclic α-maltosyl-(1→6)-maltose (CMM) is a cyclic glucotetrasaccharide with alternating α-1,4 and α-1,6 linkages. Here, we report functional and structural analyses on CMM-binding protein (CMMBP), which is a substrate-binding protein (SBP) of an ABC importer system of the bacteria Arthrobacter globiformis. Isothermal titration calorimetry analysis revealed that CMMBP specifically bound to CMM with a Kd value of 9.6 nM. The crystal structure of CMMBP was determined at a resolution of 1.47 Å, and a panose molecule was bound in a cleft between two domains. To delineate its structural features, the crystal structure of CMMBP was compared with other SBPs specific for carbohydrates, such as cyclic α-nigerosyl-(1→6)-nigerose and cyclodextrins. These results indicate that A. globiformis has a unique metabolic pathway specialized for CMM.
Organizational Affiliation:
Department of Biotechnology, The University of Tokyo, Tokyo, Japan.
