1.1.1.140: sorbitol-6-phosphate 2-dehydrogenase
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For detailed information about sorbitol-6-phosphate 2-dehydrogenase, go to the full flat file.
Reaction
Synonyms
D-glucitol-6-phosphate dehydrogenase, D-sorbitol-6-phosphate 2-dehydrogenase, D-sorbitol-6-phosphate dehydrogenase, dehydrogenase, D-sorbitol 6-phosphate, Glucitol-6-phosphate dehydrogenase, GutF, GutM, GutR, HmSorD, ketosephosphate reductase, MdS6PDH, More, operon gutFRMCBA, S6PDH, sorbitol-6-P-dehydrogenase, sorbitol-6-phosphate dehydrogenase, SrlD, Stl6PDH
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Engineering
Engineering on EC 1.1.1.140 - sorbitol-6-phosphate 2-dehydrogenase
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additional information
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mutant with a frameshift in gutR (strain BL285). The mutant loses the ability to ferment sorbitol, and transcription of the gut operon in cells grown with a mixture of ribose plus sorbitol is abolished. Sorbitol uptake rate in strain BL285 is 88fold lower than in the wild-type. GutB mutant (strain BL282) constitutively expresses the gut operon but is impaired in sorbitol uptake. GutM mutant (strain BL286) shows lower levels of gutFRMCBA transcription than the wild-type strain
additional information
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constitutive expression of the two sorbitol-6-phosphate dehydrogenase genes srlD1 and srlD2 in a mutant strain deficient for both L- and D-lactate dehydrogenase activities. Both Stl6PDH enzymes are active, and high specific activity can be detected in the overexpressing strains. Using resting cells under pH control with glucose as a substrate, both Stl6PDHs are capable of rerouting the glycolytic flux from fructose-6-phosphate toward sorbitol production with a remarkably high efficiency of 61 to 65% glucose conversion