Q05932 (FOLC_HUMAN) Reviewed, UniProtKB/Swiss-Prot
Last modified
May 1, 2013.
Version 131.
History...
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize order
Names·Attributes·General annotation·Ontologies·Alt products·Sequence annotation·Sequences·References·Cross-refs·Entry info·DocumentsCustomize orderNames and origin
| Protein names | Recommended name: Folylpolyglutamate synthase, mitochondrial EC=6.3.2.17 Alternative name(s): Folylpoly-gamma-glutamate synthetase Short name=FPGS Tetrahydrofolylpolyglutamate synthase Short name=Tetrahydrofolate synthase | ||
| Gene names |
| ||
| Organism | Homo sapiens (Human) [Reference proteome] | ||
| Taxonomic identifier | 9606 [NCBI] | ||
| Taxonomic lineage | Eukaryota › Metazoa › Chordata › Craniata › Vertebrata › Euteleostomi › Mammalia › Eutheria › Euarchontoglires › Primates › Haplorrhini › Catarrhini › Hominidae › Homo![]() |
Protein attributes
| Sequence length | 587 AA. |
| Sequence status | Complete. |
| Sequence processing | The displayed sequence is further processed into a mature form. |
| Protein existence | Evidence at protein level |
General annotation (Comments)
| Function | Catalyzes conversion of folates to polyglutamate derivatives allowing concentration of folate compounds in the cell and the intracellular retention of these cofactors, which are important substrates for most of the folate-dependent enzymes that are involved in one-carbon transfer reactions involved in purine, pyrimidine and amino acid synthesis. Unsubstitued reduced folates are the preferred substrates. Metabolizes methotrexate (MTX) to polyglutamates. Ref.4 Ref.8 Ref.9 Ref.11 |
| Catalytic activity | ATP + tetrahydropteroyl-(gamma-Glu)(n) + L-glutamate = ADP + phosphate + tetrahydropteroyl-(gamma-Glu)(n+1). Ref.4 Ref.6 Ref.8 Ref.10 Ref.13 Ref.14 |
| Cofactor | A monovalent cation. K+ is most effective, followed by NH4+ and Rb+. Na+, Li+ and Cs+ are ineffective. Ref.4 |
| Enzyme regulation | Activated by 10 mM sodium bicarbonate. Ref.4 |
| Pathway | Cofactor biosynthesis; tetrahydrofolylpolyglutamate biosynthesis. |
| Subunit structure | Monomer. |
| Subcellular location | Isoform 1: Mitochondrion inner membrane. Mitochondrion matrix Ref.4 Ref.10 Ref.12. |
| Sequence similarities | Belongs to the folylpolyglutamate synthase family. |
| Biophysicochemical properties | Kinetic parameters: KM=201 µM for L-glutamate (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) Ref.4 Ref.13 KM=200 µM for MgATP (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=59 µM for pteroylglutamic acid (PteGlu) (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=16 µM for PteGlu2 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=20 µM for PteGlu3 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=12 µM for PteGlu4 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=64 µM for PteGlu5 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=0.81 µM for H2PteGlu (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=47 µM for H2PteGlu2 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=1.6 µM for (6ambo)-tetrahydropteroylpoly-gamma-glutamate (H4PteGlu) (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=4.4 µM for (6S)-H4PteGlu (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=3.3 µM for (6S)-H4PteGlu2 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=1.4 µM for (6S)-H4PteGlu3 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=1.6 µM for (6S)-H4PteGlu4 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=1.4 µM for (6S)-H4PteGlu5 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=3.7 µM for (6R)-10-formyl-H4PteGlu (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=2.7 µM for (6R)-10-formyl-H4PteGlu2 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=105 µM for (6S)-5-formyl-H4PteGlu (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=13 µM for (6S)-5-formyl-H4PteGlu2 (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=48 µM for (6S)-5-methyl-H4PteGlu (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=4.4 µM for aminopterin (isoform 2 at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=55.5 µM for methotrexate (isoform 2, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) KM=52.6 µM for methotrexate (isoform 1, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) KM=71 µM for methotrexate (Glu-1) (isoform 2, Ref.4, at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=50 µM for methotrexate (Glu-2) (isoform 2, Ref.4, at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=148 µM for methotrexate (Glu-3) (isoform 2, Ref.4, at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=5.3 µM for 5-deazaacyclotetrahydrofolate (isoform 2, at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=2.8 µM for 2-methyl-5,8-dideazaisofolate (isoform 2, at 37 degrees Celsius in the presence of 1 mM ATP and 2 mM L-glutamate) KM=1702 µM for glutamic acid (isoform 2, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) KM=2068 µM for glutamic acid (isoform 1, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) Vmax=0.34 µmol/h/mg enzyme with methotrexate as substrate (isoform 2, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) Vmax=0.05 µmol/h/mg enzyme with methotrexate as substrate (isoform 1, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) Vmax=1.26 µmol/h/mg enzyme with glutamic acid as substrate (isoform 2, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) Vmax=0.25 µmol/h/mg enzyme with glutamic acid as substrate (isoform 1, Ref.13, at 37 degrees Celsius in the presence of 10 mM ATP and pH 8.5) pH dependence: Optimum pH is 9.6 (isoform 2). |
| Sequence caution | The sequence AAA35852.1 differs from that shown. Reason: Erroneous initiation. Translation N-terminally extended. |
Ontologies
Alternative products
| This entry describes 4 isoforms produced by alternative splicing and alternative initiation. [Align] [Select] | ||||||
| Isoform 1 (identifier: Q05932-1) Also known as: Mitochondrial; This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry. | ||||||
| Isoform 2 (identifier: Q05932-2) Also known as: Cytoplasmic; The sequence of this isoform differs from the canonical sequence as follows: 1-42: Missing. | ||||||
| Note: Produced by alternative initiation at Met-43 of isoform 1. | ||||||
| Isoform 3 (identifier: Q05932-3) The sequence of this isoform differs from the canonical sequence as follows: 1-42: Missing. 43-50: Missing. | ||||||
| Note: Produced by alternative splicing of isoform 1. | ||||||
| Isoform 4 (identifier: Q05932-4) The sequence of this isoform differs from the canonical sequence as follows: 168-193: Missing. | ||||||
| Note: Produced by alternative splicing of isoform 1. |
Sequence annotation (Features)
| Feature key | Position(s) | Length | Description | Graphical view | Feature identifier | ||||
Molecule processing | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Transit peptide | 1 – 42 | 42 | Mitochondrion | ||||||
| Chain | 43 – 587 | 545 | Folylpolyglutamate synthase, mitochondrial | PRO_0000010097 | |||||
Regions | |||||||||
| Nucleotide binding | 103 – 109 | 7 | ATP Potential | ||||||
Amino acid modifications | |||||||||
| Modified residue | 33 | 1 | Phosphoserine By similarity | ||||||
Natural variations | |||||||||
| Alternative sequence | 1 – 42 | 42 | Missing in isoform 2 and isoform 3. | VSP_018733 | |||||
| Alternative sequence | 43 – 50 | 8 | Missing in isoform 3. | VSP_041959 | |||||
| Alternative sequence | 168 – 193 | 26 | Missing in isoform 4. | VSP_041960 | |||||
| Natural variant | 13 | 1 | F → L. Ref.13 Corresponds to variant rs11554717 [ dbSNP | Ensembl ]. | VAR_066016 | |||||
| Natural variant | 22 | 1 | I → V. Ref.1 Ref.3 Ref.5 Corresponds to variant rs10760502 [ dbSNP | Ensembl ]. | VAR_059305 | |||||
| Natural variant | 437 | 1 | V → D. Corresponds to variant rs12686275 [ dbSNP | Ensembl ]. | VAR_043929 | |||||
| Natural variant | 466 | 1 | R → C Expression reduced by 1.86-fold and Vmax with methotrexate as substrate reduced significantly. The intrinsic clearance of methotrexate is significantly reduced. Km of glutamic acid is increased 3.5-fold and apparent Vmax of it is reduced 3.4-fold. Reaction velocity at 100 nmol/L of pemetrexed is significantly reduced and folic acid dose-response curve is shifted to the right which corresponds to 4.32-fold increase in the EC(50) for folic acid. IC(50) of methotrexate is 1.84-fold higher and accummulation of a lower ratio of long-chain methotrexate polyglutamates to short-chain polyglutamates is detected. All results are for isoform 2 variant in comparison to the wild-type of it. Ref.13 Corresponds to variant rs35789560 [ dbSNP | Ensembl ]. | VAR_066017 | |||||
| Natural variant | 489 | 1 | A → V. Ref.3 Ref.13 Corresponds to variant rs17855900 [ dbSNP | Ensembl ]. | VAR_043930 | |||||
| Natural variant | 499 | 1 | S → F Expression reduced by 2.11-fold and Vmax with methotrexate as substrate reduced significantly. The intrinsic clearance of methotrexate is significantly reduced. Apparent Vmax for glutamic acid is reduced 5-fold. Reaction velocity at 100 nmol/L of pemetrexed is significantly reduced and folic acid dose-response curve is shifted to the right which corresponds to 4.28-fold increase in the EC(50) for folic acid. IC(50) of methotrexate is 1.64-fold higher and accummulation of a lower ratio of long-chain methotrexate polyglutamates to short-chain polyglutamates is detected. All results are for isoform 2 variant in comparison to the wild-type of it. Ref.13 | VAR_066018 | |||||
| Natural variant | 528 | 1 | S → T. Corresponds to variant rs34354111 [ dbSNP | Ensembl ]. | VAR_043931 | |||||
Experimental info | |||||||||
| Sequence conflict | 101 | 1 | V → A in BAG51826. Ref.1 | ||||||
Sequences
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References
| « Hide 'large scale' references | |
| [1] | "Complete sequencing and characterization of 21,243 full-length human cDNAs." Ota T., Suzuki Y., Nishikawa T., Otsuki T., Sugiyama T., Irie R., Wakamatsu A., Hayashi K., Sato H., Nagai K., Kimura K., Makita H., Sekine M., Obayashi M., Nishi T., Shibahara T., Tanaka T., Ishii S. Sugano S.Nat. Genet. 36:40-45(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORMS 3 AND 4), VARIANT VAL-22. |
| [2] | "DNA sequence and analysis of human chromosome 9." Humphray S.J., Oliver K., Hunt A.R., Plumb R.W., Loveland J.E., Howe K.L., Andrews T.D., Searle S., Hunt S.E., Scott C.E., Jones M.C., Ainscough R., Almeida J.P., Ambrose K.D., Ashwell R.I.S., Babbage A.K., Babbage S., Bagguley C.L. Dunham I.Nature 429:369-374(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. |
| [3] | "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)." The MGC Project Team Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1), VARIANTS VAL-22 AND VAL-489. Tissue: Lung. |
| [4] | "Purification and properties of human cytosolic folylpoly-gamma-glutamate synthetase and organization, localization, and differential splicing of its gene." Chen L., Qi H., Korenberg J., Garrow T.A., Choi Y.J., Shane B. J. Biol. Chem. 271:13077-13087(1996) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-353, FUNCTION, CATALYTIC ACTIVITY, COFACTOR, ENZYME REGULATION, BIOPHYSICOCHEMICAL PROPERTIES, SUBSTRATE SPECIFICITY, SUBCELLULAR LOCATION, ALTERNATIVE SPLICING. Tissue: Fibroblast. |
| [5] | "Upstream organization of and multiple transcripts from the human folylpoly-gamma-glutamate synthetase gene." Freemantle S.J., Taylor S.M., Krystal G., Moran R.G. J. Biol. Chem. 270:9579-9584(1995) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-107, ALTERNATIVE INITIATION, VARIANT VAL-22. Tissue: Placenta. |
| [6] | "Expression cloning of a human cDNA encoding folylpoly(gamma-glutamate) synthetase and determination of its primary structure." Garrow T.A., Admon A., Shane B. Proc. Natl. Acad. Sci. U.S.A. 89:9151-9155(1992) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [MRNA] OF 20-587 (ISOFORM 1), CATALYTIC ACTIVITY. Tissue: Lymphocyte. |
| [7] | "Structural organization of the human folypoly-gamma-glutamate synthetase gene: evidence for a single genomic locus." Taylor S.M., Freemantle S.J., Moran R.G. Cancer Res. 55:6030-6034(1995) [PubMed] [Europe PMC] [Abstract] Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 102-587. Tissue: Placenta. |
| [8] | "Regulation of folate and one-carbon metabolism in mammalian cells. I. Folate metabolism in Chinese hamster ovary cells expressing Escherichia coli or human folylpoly-gamma-glutamate synthetase activity." Osborne C.B., Lowe K.E., Shane B. J. Biol. Chem. 268:21657-21664(1993) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION, CATALYTIC ACTIVITY. |
| [9] | "Regulation of folate and one-carbon metabolism in mammalian cells. II. Effect of folylpoly-gamma-glutamate synthetase substrate specificity and level on folate metabolism and folylpoly-gamma-glutamate specificity of metabolic cycles of one-carbon metabolism." Lowe K.E., Osborne C.B., Lin B.F., Kim J.S., Hsu J.C., Shane B. J. Biol. Chem. 268:21665-21673(1993) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION. |
| [10] | "Regulation of folate and one-carbon metabolism in mammalian cells. III. Role of mitochondrial folylpoly-gamma-glutamate synthetase." Lin B.F., Huang R.F., Shane B. J. Biol. Chem. 268:21674-21679(1993) [PubMed] [Europe PMC] [Abstract] Cited for: CATALYTIC ACTIVITY, SUBCELLULAR LOCATION. |
| [11] | "Regulation of folate and one-carbon metabolism in mammalian cells. IV. Role of folylpoly-gamma-glutamate synthetase in methotrexate metabolism and cytotoxicity." Kim J.S., Lowe K.E., Shane B. J. Biol. Chem. 268:21680-21685(1993) [PubMed] [Europe PMC] [Abstract] Cited for: FUNCTION. |
| [12] | "Submitochondrial localization of the mitochondrial isoform of folylpolyglutamate synthetase in CCRF-CEM human T-lymphoblastic leukemia cells." Nair J.R., McGuire J.J. Biochim. Biophys. Acta 1746:38-44(2005) [PubMed] [Europe PMC] [Abstract] Cited for: SUBCELLULAR LOCATION. |
| [13] | "Identification and characterization of genetic variation in the folylpolyglutamate synthase gene." Leil T.A., Endo C., Adjei A.A., Dy G.K., Salavaggione O.E., Reid J.R., Ames M.M., Adjei A.A. Cancer Res. 67:8772-8782(2007) [PubMed] [Europe PMC] [Abstract] Cited for: CATALYTIC ACTIVITY, BIOPHYSICOCHEMICAL PROPERTIES, VARIANTS LEU-13; CYS-466; VAL-489 AND PHE-499. |
| [14] | "Concentration-dependent processivity of multiple glutamate ligations catalyzed by folylpoly-gamma-glutamate synthetase." Tomsho J.W., Moran R.G., Coward J.K. Biochemistry 47:9040-9050(2008) [PubMed] [Europe PMC] [Abstract] Cited for: CATALYTIC ACTIVITY, REACTION MECHANISM. |
| + | Additional computationally mapped references. |
Cross-references
Sequence databases | |
|---|---|
| EMBL GenBank DDBJ | AK056920 mRNA. Translation: BAG51826.1. AK295309 mRNA. Translation: BAH12029.1. AL162586 Genomic DNA. Translation: CAI39770.1. AL162586 Genomic DNA. Translation: CAI39773.1. BC064393 mRNA. Translation: AAH64393.1. AH006037 Genomic DNA. Translation: AAC13871.1. M98045 mRNA. Translation: AAA35852.1. Different initiation. U14939 Genomic DNA. Translation: AAA85815.1. AH003340 Genomic DNA. Translation: AAA87568.1. |
| IPI | IPI00016745. IPI00759584. |
| PIR | A46281. |
| RefSeq | NP_001018088.1. NM_001018078.1. NP_004948.4. NM_004957.4. |
| UniGene | Hs.335084. |
3D structure databases | |
| ProteinModelPortal | Q05932. |
| ModBase | Search... |
Protein-protein interaction databases | |
| STRING | 9606.ENSP00000362344. |
PTM databases | |
| PhosphoSite | Q05932. |
Polymorphism databases | |
| DMDM | 1706884. |
Proteomic databases | |
| PaxDb | Q05932. |
| PRIDE | Q05932. |
Protocols and materials databases | |
| DNASU | 2356. |
| StructuralBiologyKnowledgebase | Search... |
Genome annotation databases | |
| Ensembl | ENST00000373225; ENSP00000362322; ENSG00000136877. ENST00000373247; ENSP00000362344; ENSG00000136877. ENST00000393706; ENSP00000377309; ENSG00000136877. |
| GeneID | 2356. |
| KEGG | hsa:2356. |
| UCSC | uc004bsg.1. human. |
Organism-specific databases | |
| CTD | 2356. |
| GeneCards | GC09P130556. |
| HGNC | HGNC:3824. FPGS. |
| HPA | HPA050488. |
| MIM | 136510. gene+phenotype. |
| neXtProt | NX_Q05932. |
| PharmGKB | PA167. |
| GenAtlas | Search... |
Phylogenomic databases | |
| eggNOG | COG0285. |
| HOGENOM | HOG000181278. |
| HOVERGEN | HBG003086. |
| InParanoid | Q05932. |
| KO | K01930. |
| OMA | MEYQDAI. |
| OrthoDB | EOG4CRKZZ. |
| PhylomeDB | Q05932. |
Enzyme and pathway databases | |
| Reactome | REACT_111217. Metabolism. |
| UniPathway | UPA00850. |
Gene expression databases | |
| ArrayExpress | Q05932. |
| Bgee | Q05932. |
| CleanEx | HS_FPGS. |
| Genevestigator | Q05932. |
| GermOnline | ENSG00000136877. Homo sapiens. |
Family and domain databases | |
| Gene3D | 3.40.1190.10. 1 hit. 3.90.190.20. 3 hits. |
| InterPro | IPR001645. Folylpolyglutamate_synth. IPR018109. Folylpolyglutamate_synth_CS. IPR023600. Folylpolyglutamate_synth_euk. IPR004101. Mur_ligase_C. IPR013221. Mur_ligase_cen. [Graphical view] |
| PANTHER | PTHR11136. PTHR11136. 1 hit. |
| PIRSF | PIRSF038895. FPGS. 1 hit. |
| SUPFAM | SSF53244. Mur_ligase_C. 1 hit. SSF53623. Mur_ligase_cen. 1 hit. |
| TIGRFAMs | TIGR01499. folC. 1 hit. |
| PROSITE | PS01011. FOLYLPOLYGLU_SYNT_1. 1 hit. PS01012. FOLYLPOLYGLU_SYNT_2. 1 hit. [Graphical view] |
| ProtoNet | Search... |
Other | |
| BindingDB | Q05932. |
| ChEMBL | CHEMBL3171. |
| DrugBank | DB00142. L-Glutamic Acid. |
| GenomeRNAi | 2356. |
| NextBio | 9555. |
| SOURCE | Search... |
Entry information
| Entry name | FOLC_HUMAN | ||||||||
| Accession | Primary (citable) accession number: Q05932 Secondary accession number(s): B3KPW4 Q6P2P6 | ||||||||
| Entry history |
| ||||||||
| Entry status | Reviewed (UniProtKB/Swiss-Prot) | ||||||||
| Annotation program | Chordata Protein Annotation Program | ||||||||
| Disclaimer | Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. | ||||||||
Relevant documents
| Human chromosome 9 Human chromosome 9: entries, gene names and cross-references to MIM |
| Human entries with polymorphisms or disease mutations List of human entries with polymorphisms or disease mutations |
| Human polymorphisms and disease mutations Index of human polymorphisms and disease mutations |
| MIM cross-references Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot |
| PATHWAY comments Index of metabolic and biosynthesis pathways |
| SIMILARITY comments Index of protein domains and families |

Clusters with
