Reaction: 2-dehydro-3-deoxy-L-rhamnonate + NAD+ = 2,4-didehydro-3-deoxy-L-rhamnonate + NADH + H+
Other name(s): 2-keto-3-deoxy-L-rhamnonate dehydrogenase
Systematic name: 2-dehydro-3-deoxy-L-rhamnonate:NAD+ 4-oxidoreductase
Comments: The enzyme, characterized from the bacteria Sphingomonas sp. SKA58 and Sulfobacillus thermosulfidooxidans, is involved in the non-phosphorylative degradation pathway for L-rhamnose. It does not show any detectable activity with NADP+ or with other aldoses.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
1. Watanabe, S. and Makino, K. Novel modified version of nonphosphorylated sugar metabolism an alternative L-rhamnose pathway of Sphingomonas sp. FEBS J. 276 (2009) 1554-1567. [PMID: 19187228]
2. Bae, J., Kim, S.M. and Lee, S.B. Identification and characterization of 2-keto-3-deoxy-L-rhamnonate dehydrogenase belonging to the MDR superfamily from the thermoacidophilic bacterium Sulfobacillus thermosulfidooxidans: implications to L-rhamnose metabolism in archaea. Extremophiles 19 (2015) 469-478. [PMID: 25617114]