Tetrahydrofolic acid

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Tetrahydrofolic acid

IUPAC name (2S)-2-{[4-({[(6R)-2-amino-4-oxo-1,4,5,6,7,8-hexahydropteridin-6-yl]methyl}amino)phenyl]formamido}pentanedioic acid
Identifiers
CAS number	135-16-0^N
PubChem	91443
ChemSpider	82572^Y
DrugBank	DB00116
KEGG	C00101^Y
MeSH	5,6,7,8-tetrahydrofolic+acid
ChEBI	CHEBI:20506^Y
Jmol-3D images	{{#if:O=C(O)[C@@H](NC(=O)c1ccc(cc1)NCC3N/C2=C(/N/C(=N\C2=O)N)NC3)CCC(=O)O\|Image 1
SMILES O=C(O)[C@@H](NC(=O)c1ccc(cc1)NCC3N/C2=C(/N/C(=N\C2=O)N)NC3)CCC(=O)O
InChI InChI=1S/C19H23N7O6/c20-19-25-15-14(17(30)26-19)23-11(8-22-15)7-21-10-3-1-9(2-4-10)16(29)24-12(18(31)32)5-6-13(27)28/h1-4,11-12,21,23H,5-8H2,(H,24,29)(H,27,28)(H,31,32)(H4,20,22,25,26,30)/t11?,12-/m0/s1^Y Key: MSTNYGQPCMXVAQ-KIYNQFGBSA-N^Y InChI=1/C19H23N7O6/c20-19-25-15-14(17(30)26-19)23-11(8-22-15)7-21-10-3-1-9(2-4-10)16(29)24-12(18(31)32)5-6-13(27)28/h1-4,11-12,21,23H,5-8H2,(H,24,29)(H,27,28)(H,31,32)(H4,20,22,25,26,30)/t11?,12-/m0/s1 Key: MSTNYGQPCMXVAQ-KIYNQFGBBC
Properties
Molecular formula	C₁₉H₂₃N₇O₆
Molar mass	445.43 g/mol
N (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Tetrahydrofolic acid, or tetrahydrofolate, is a folic acid derivative.

Metabolism

Synthesis pathway of tetrahydrofolic acid (click to enlarge).

Human synthesis

It is produced from dihydrofolic acid by dihydrofolate reductase. This reaction is inhibited by methotrexate.

It is converted into 5,10-methylenetetrahydrofolate by serine hydroxymethyltransferase.

Bacterial synthesis

Many bacteria use dihydropteroate synthetase to produce dihydropteroate, a molecule without function in humans. This makes it a useful target for sulfonamide antibiotics, which compete with the PABA precursor.

Functions

It is a cofactor in many reactions, especially in the metabolism of amino acids and nucleic acids. It acts as a donor of a group with one carbon atom. It gets this carbon atom by sequestering formaldehyde produced in other processes. A shortage in THF can cause megaloblastic anemia.

Methotrexate acts on dihydrofolate reductase, like pyrimethamine or trimethoprim, as an inhibitor and thus reduces the amount of tetrahydrofolate made. This may result in megaloblastic anemia.

Tetrahydrofolic acid is involved in the conversion of formiminoglutamic acid to glutamic acid; this may reduce the amount of histidine available for decarboxylation and protein synthesis, and hence the urinary histamine and formiminoglutamic acid may be decreased.^[1]

Enzyme cofactors

Active forms

vitamins	TPP / ThDP (B₁) FMN, FAD (B₂) NAD⁺, NADH, NADP⁺, NADPH (B₃) Coenzyme A (B₅) PLP / P5P (B₆) Biotin (B₇) THFA / H₄FA, DHFA / H₂FA, MTHF (B₉) AdoCbl, MeCbl (B₁₂) Ascorbic Acid (C) Phylloquinone (K₁), Menaquinone (K₂) Coenzyme F420

non-vitamins	ATP CTP SAMe PAPS GSH Coenzyme B Cofactor F430 Coenzyme M Coenzyme Q Heme / Haem (A, B, C, O) Lipoic Acid Methanofuran Molybdopterin/Molybdenum cofactor PQQ THB / BH₄ THMPT / H₄MPT

minerals	Ca²⁺ Cu²⁺ Fe²⁺, Fe³⁺ Mg²⁺ Mn²⁺ Mo Ni²⁺ Se Zn²⁺

Base forms

vitamins: see vitamins

M: NUT

cof, enz, met

noco, nuvi, sysi/epon, met

drug (A8/11/12)

References

↑ Dawson W, Maudsley DV, West GB (December 1965). "Histamine formation in guinea-pigs". J. Physiol. (Lond.) 181 (4): 801–9. PMC 1357684. PMID 5881255.

External links

Tetrahydrofolate bound to proteins in the PDB

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