Pteroylpoly(gamma-glutamate) synthesis by Corynebacterium species. In vivo synthesis of folates.
Corynebacterium sp. synthesizes pteroylpolyglutamates which are excreted into its growth medium. The major intracellular folates were identified as 10-formyltetrahydro-, 5-formyltetrahydro-, tetrahydro-, and 10-formylpteroyltetraglutamates. The major folates in the medium were identified as 10-formylpteroyltri- and tetraglutamates. p-Aminobenzoic was metabolized to these compounds without any appreciable buildup of pteroylmono- or diglutamate derivatives. The rate-limiting steps in the elongation of the glutamate chain of folate derivatives appear to be at the level of formation of a pteroate derivative and at the pteroyltetraglutamate level.
D001692:Biological Transport; D003352:Corynebacterium / Q000378:metabolism*; D005492:Folic Acid / Q000031:analogs & derivatives* / Q000096:biosynthesis*; D011624:Pteroylpolyglutamic Acids / Q000096:biosynthesis* / Q000302:isolation & purification
D011624:Pteroylpolyglutamic Acids; D005492:Folic Acid