ID 1.3.99.38 DE menaquinone-9beta-reductase. CA AH2 + menaquinone-9 = A + beta-dihydromenaquinone-9. CC -!- The enzyme from the bacterium Mycobacterium tuberculosis reduces the CC beta-isoprene unit of menaquinone-9, forming the predominant form of CC menaquinone found in mycobacteria. DR A0QRI8, MENJ_MYCS2 ; P9WNY8, MENJ_MYCTO ; P9WNY9, MENJ_MYCTU ; //