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Levomefolic acid (INN, also known as L-5-MTHF, L-methylfolate and L-5-methyltetrahydrofolate and (6S)-5-methyltetrahydrofolate, and (6S)-5-MTHF) is the primary biologically active form of folate used at the cellular level for DNA reproduction, the cysteine cycle and the regulation of homocysteine.
5,10-Methenyltetrahydrofolate (5,10-CH=THF) is a form of tetrahydrofolate that is an intermediate in metabolism.5,10-CH=THF is a coenzyme that accepts and donates methenyl (CH=) groups.
A different study corroborates these results and suggests a physiological dose (800 μg) of 5-methyltetrahydrofolate can bypass MTHFR C677T and A1298C isoforms in couples with fertility problems. [16] This treatment with 5-MTHF also avoids un-metabolized folic acid syndrome, which can occur with folic acid intakes of 5 mg per day. [16]
As an intermediate in one-carbon metabolism, 5,10-CH 2-THF converts to 5-methyltetrahydrofolate, 5-formyltetrahydrofolate, and methenyltetrahydrofolate. It is substrate for the enzyme methylenetetrahydrofolate reductase (MTHFR) [ 1 ] [ 2 ] It is mainly produced by the reaction of tetrahydrofolate with serine, catalyzed by the enzyme serine ...
Tetrahydrofolic acid is a cofactor in many reactions, especially in the synthesis (or anabolism) of amino acids and nucleic acids.In addition, it serves as a carrier molecule for single-carbon moieties, that is, groups containing one carbon atom e.g. methyl, methylene, methenyl, formyl, or formimino.
Folate (vitamin B 9) refers to the many forms of folic acid and its related compounds, including tetrahydrofolic acid (the active form), methyltetrahydrofolate (the primary form found in blood), methenyltetrahydrofolate, folinic acid, folacin, and pteroylglutamic acid.