Identification and characterization of 2-keto-3-deoxy-l-rhamnonate dehydrogenase belonging to the MDR superfamily from the thermoacidophilic bacterium Sulfobacillus thermosulfidooxidans: implications to lrhamnose metabolism in archaea
SCIE
SCOPUS
- Title
- Identification and characterization of 2-keto-3-deoxy-l-rhamnonate dehydrogenase belonging to the MDR superfamily from the thermoacidophilic bacterium Sulfobacillus thermosulfidooxidans: implications to lrhamnose metabolism in archaea
- Authors
- Bae, J; Kim, SM; Lee, SB
- Date Issued
- 2015-03
- Publisher
- SPRINGER JAPAN KK
- Abstract
- We identified the non-phosphorylated l-rhamnose metabolic pathway (Rha_NMP) genes that are homologous to those in the thermoacidophilic archaeon Thermoplasma acidophilum in the genome of the thermoacidophilic bacterium Sulfobacillus thermosulfidooxidans. However, unlike previously known 2-keto-3-deoxy-l-rhamnonate (l-KDR) dehydrogenase (KDRDH) which belongs to the short chain dehydrogenase/reductase superfamily, the putative KDRDHs in S. thermosulfidooxidans (Sulth_3557) and T. acidophilum (Ta0749) belong to the medium chain dehydrogenase/reductase (MDR) superfamily. We demonstrated that Sulth_3559 and Sulth_3557 proteins from S. thermosulfidooxidans function as l-rhamnose dehydrogenase and KDRDH, respectively. Sulth_3557 protein is an NAD(+)-specific KDRDH with optimal temperature and pH of 50 A degrees C and 9.5, respectively. The K (m) and V (max) values for l-KDR were 2.0 mM and 12.8 U/mg, respectively. Sulth_3557 also showed weak 2,3-butanediol dehydrogenase activity. Phylogenetic analysis suggests that Sulth_3557 and its homologs form a new subfamily in the MDR superfamily. The results shown in this study imply that thermoacidophilic archaea metabolize l-rhamnose to pyruvate and l-lactate by using the MDR-family KDRDH similarly to that of the thermoacidophilic bacterium S. thermosulfidooxidans.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/26934
- DOI
- 10.1007/S00792-015-0731-8
- ISSN
- 1431-0651
- Article Type
- Article
- Citation
- EXTREMOPHILES, vol. 19, no. 2, page. 469 - 478, 2015-03
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