| 摘要 |
PCT No. PCT/EP89/00010 Sec. 371 Date Jun. 11, 1990 Sec. 102(e) Date Jun. 11, 1990 PCT Filed Jan. 9, 1989 PCT Pub. No. WO89/06688 PCT Pub. Date Jul. 27, 1989.A novel coenzyme independent L-sorbosone dehydrogenase originating from a microorganism belonging to the genus Gluconobacter oxydans which acts on L-sorbosone to produce 2-keto-L-gulonic acid. The enzyme has the following physico-chemical properties: a) optimum pH: about 7.0, b) optimum temperature: about 30 DEG C. to about 40 DEG C., c) molecular sturucture: consisting of one type of unit having a molecular weight of about 47,500+/-5,000 as measured by sodium dodecyl sulfate polyacrylamide gel electrophoresis, d) thermostability: stable below 30 DEG C., and e) inhibition: by Cu2+-ions. |
