Vitamin B12
The biosynthesis of B 12 , involving up to 30 different enzyme-mediated steps, only occurs in bacteria. Thus, most eukaryotes require an external source of B 12 , and yet the vitamin appears to have only two functions in eukaryotes: as a cofactor for the enzymes methionine synthase and methylmalonyl...
| Main Authors: | , , |
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| 格式: | Journal article |
| 出版: |
Elsevier
2018
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