Folate receptor beta

NameFolate receptor beta
Synonyms
  • FBP
  • Folate receptor 2
  • Folate receptor, fetal/placental
  • FR-beta
  • Placental folate-binding protein
Gene NameFOLR2
OrganismHuman
Amino acid sequence
>lcl|BSEQ0016050|Folate receptor beta
MVWKWMPLLLLLVCVATMCSAQDRTDLLNVCMDAKHHKTKPGPEDKLHDQCSPWKKNACC
TASTSQELHKDTSRLYNFNWDHCGKMEPACKRHFIQDTCLYECSPNLGPWIQQVNQSWRK
ERFLDVPLCKEDCQRWWEDCHTSHTCKSNWHRGWDWTSGVNKCPAGALCRTFESYFPTPA
ALCEGLWSHSYKVSNYSRGSGRCIQMWFDSAQGNPNEEVARFYAAAMHVNAGEMLHGTGG
LLLSLALMLQLWLLG
Number of residues255
Molecular Weight29279.31
Theoretical pI7.56
GO Classification
Functions
  • folic acid binding
  • folic acid receptor activity
  • folic acid transporter activity
  • methotrexate binding
  • drug binding
Processes
  • inflammatory response
  • receptor-mediated endocytosis
  • positive regulation of cell proliferation
  • cellular response to folic acid
  • folic acid transport
  • regulation of thymidylate synthase biosynthetic process
Components
  • membrane
  • extracellular region
  • cell surface
  • anchored component of external side of plasma membrane
General FunctionMethotrexate binding
Specific FunctionBinds to folate and reduced folic acid derivatives and mediates delivery of 5-methyltetrahydrofolate and folate analogs into the interior of cells. Has high affinity for folate and folic acid analogs at neutral pH. Exposure to slightly acidic pH after receptor endocytosis triggers a conformation change that strongly reduces its affinity for folates and mediates their release.
Pfam Domain Function
Transmembrane RegionsNot Available
GenBank Protein ID1655592
UniProtKB IDP14207
UniProtKB Entry NameFOLR2_HUMAN
Cellular LocationCell membrane
Gene sequence
>lcl|BSEQ0016051|Folate receptor beta (FOLR2)
ATGGTCTGGAAATGGATGCCACTTCTGCTGCTTCTGGTCTGTGTAGCCACCATGTGCAGT
GCCCAGGACAGGACTGATCTCCTCAATGTCTGTATGGATGCCAAGCACCACAAGACAAAG
CCAGGTCCTGAGGACAAGCTGCATGACCAATGCAGTCCCTGGAAGAAGAATGCCTGCTGC
ACAGCCAGCACCAGCCAGGAGCTGCACAAGGACACCTCCCGCCTGTACAACTTTAACTGG
GACCACTGCGGCAAGATGGAGCCCGCCTGCAAGCGCCACTTCATCCAGGACACCTGTCTC
TATGAGTGCTCACCCAACCTGGGGCCCTGGATCCAGCAGGTGAATCAGAGCTGGCGCAAA
GAACGCTTCCTGGATGTGCCCTTATGCAAAGAGGACTGTCAGCGCTGGTGGGAGGATTGT
CACACCTCCCACACGTGCAAGAGCAACTGGCACAGAGGATGGGACTGGACCTCAGGAGTT
AACAAGTGCCCAGCTGGGGCTCTCTGCCGCACCTTTGAGTCCTACTTCCCCACTCCAGCT
GCCCTTTGTGAAGGCCTCTGGAGTCACTCATACAAGGTCAGCAACTACAGCCGAGGGAGC
GGCCGCTGCATCCAGATGTGGTTTGATTCAGCCCAGGGCAACCCCAACGAGGAAGTGGCG
AGGTTCTATGCTGCAGCCATGCATGTGAATGCTGGTGAGATGCTTCATGGGACTGGGGGT
CTCCTGCTCAGTCTGGCCCTGATGCTGCAACTCTGGCTCCTTGGCTGA
GenBank Gene IDX69516
GeneCard IDNot Available
GenAtlas IDFOLR2
HGNC IDHGNC:3793
Chromosome Location11
Locus11q13.3-q13.5
References
  1. Page ST, Owen WC, Price K, Elwood PC: Expression of the human placental folate receptor transcript is regulated in human tissues. Organization and full nucleotide sequence of the gene. J Mol Biol. 1993 Feb 20;229(4):1175-83. 8445646
  2. Ratnam M, Marquardt H, Duhring JL, Freisheim JH: Homologous membrane folate binding proteins in human placenta: cloning and sequence of a cDNA. Biochemistry. 1989 Oct 3;28(20):8249-54. 2605182
  3. Sadasivan E, Cedeno MM, Rothenberg SP: Characterization of the gene encoding a folate-binding protein expressed in human placenta. Identification of promoter activity in a G-rich SP1 site linked with the tandemly repeated GGAAG motif for the ets encoded GA-binding protein. J Biol Chem. 1994 Feb 18;269(7):4725-35. 8106441
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  5. Freisheim JH, Price EM, Ratnam M: Folate coenzyme and antifolate transport proteins in normal and neoplastic cells. Adv Enzyme Regul. 1989;29:13-26. 2561247
  6. Antony AC, Kane MA, Portillo RM, Elwood PC, Kolhouse JF: Studies of the role of a particulate folate-binding protein in the uptake of 5-methyltetrahydrofolate by cultured human KB cells. J Biol Chem. 1985 Dec 5;260(28):14911-7. 4066659
  7. Yan W, Ratnam M: Preferred sites of glycosylphosphatidylinositol modification in folate receptors and constraints in the primary structure of the hydrophobic portion of the signal. Biochemistry. 1995 Nov 7;34(44):14594-600. 7578066
  8. Wang J, Shen F, Yan W, Wu M, Ratnam M: Proteolysis of the carboxyl-terminal GPI signal independent of GPI modification as a mechanism for selective protein secretion. Biochemistry. 1997 Nov 25;36(47):14583-92. 9398177
  9. Xu Y, Wang T, Tang R, Tang S: All-trans retinoic acid is capable of inducing folate receptor beta expression in KG-1 cells. Tumour Biol. 2010 Dec;31(6):589-95. doi: 10.1007/s13277-010-0074-0. Epub 2010 Jul 15. 20632143
  10. Wibowo AS, Singh M, Reeder KM, Carter JJ, Kovach AR, Meng W, Ratnam M, Zhang F, Dann CE 3rd: Structures of human folate receptors reveal biological trafficking states and diversity in folate and antifolate recognition. Proc Natl Acad Sci U S A. 2013 Sep 17;110(38):15180-8. doi: 10.1073/pnas.1308827110. Epub 2013 Aug 9. 23934049
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