Download MendeleyMirror substrates specificity of a 2, 3-dihydroxypropanesulfonate degrading enzyme in sulfate-reducing bacteria.
Ma, X., Wang, H., Liu, L., Dang, H., Tang, K.(2025) Int J Biol Macromol 306: 141806-141806
- PubMed: 40054810 Search on PubMed
- DOI: https://doi.org/10.1016/j.ijbiomac.2025.141806
- Primary Citation Related Structures:
9K2J - PubMed Abstract:
Ubiquitous R- and S-enantiomers of 2,3-dihydroxypropanesulfonate (DHPS), organic sulfur compounds produced by photosynthetic organisms, serve as common nutrient and energy sources for specific bacteria. While most known DHPS-degrading enzymes exhibit enantioselectivity, this study introduces a unique dehydrogenase, DhpA from the sulfate-reducing bacterium Desulfovibrio sp. DF1, capable of efficiently metabolizing both R- and S-DHPS to 3-sulfolactaldehyde (SLA). The crystal structure of DhpA reveals a conserved binding pocket that recognizes the sulfonate group of DHPS through interactions with Lys123, Ser174, and Asn175. The catalytic mechanism of the enzyme involves the oxidation of the C3-OH group of both enantiomers, facilitated by the Lys171. The mutation of Lys171 significantly diminishes activity, confirming its critical role in catalysis. Based on biochemical and genetic analyses, this study proposes a chiral DHPS degradation pathway in bacteria. This study reveals the unique enantiomeric selectivity of DhpA, expanding our understanding of the bacterial metabolism of chiral molecules.
- State Key Laboratory of Marine Environmental Science, Fujian Key Laboratory of Marine Carbon Sequestration, College of Ocean and Earth Science, Xiamen University, Xiamen, China.
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