General approach to reversing ketol-acid reductoisomerase cofactor dependence from NADPH to NADH
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States); MRC Lab. of Molecular Biology, Cambridge (United Kingdom)
- California Inst. of Technology (CalTech), Pasadena, CA (United States); Colorado State Univ., Fort Collins, CO (United States)
- California Inst. of Technology (CalTech), Pasadena, CA (United States); Univ. of North Carolina, Chapel Hill, NC (United States)
- Gevo, Inc., Englewood, CO (United States)
To date, efforts to switch the cofactor specificity of oxidoreductases from nicotinamide adenine dinucleotide phosphate (NADPH) to nicotinamide adenine dinucleotide (NADH) have been made on a case-by-case basis with varying degrees of success. Here we present a straightforward recipe for altering the cofactor specificity of a class of NADPH-dependent oxidoreductases, the ketol-acid reductoisomerases (KARIs). Combining previous results for an engineered NADH-dependent variant of Escherichia coli KARI with available KARI crystal structures and a comprehensive KARI-sequence alignment, we identified key cofactor specificity determinants and used this information to construct five KARIs with reversed cofactor preference. Additional directed evolution generated two enzymes having NADH-dependent catalytic efficiencies that are greater than the wild-type enzymes with NADPH. As a result, high-resolution structures of a wild-type/variant pair reveal the molecular basis of the cofactor switch.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1128893
- Report Number(s):
- SLAC-REPRINT-2014-040
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Vol. 110, Issue 27; ISSN 0027-8424
- Publisher:
- National Academy of Sciences, Washington, DC (United States)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Cofactor engineering of ketol-acid reductoisomerase (IlvC) and alcohol dehydrogenase (YqhD) improves the fusel alcohol yield in algal protein anaerobic fermentation
Oxalyl hydroxamates as reaction-intermediate analogues for ketol-acid reductoisomerase