Biology:SLC3A2

Generic protein structure example

4F2 cell-surface antigen heavy chain is a protein that in humans is encoded by the SLC3A2 (solute carrier family 3 member 2) gene.

SLC3A2 comprises the heavy subunit of the large neutral amino acid transporter (LAT1) that is also known as CD98 (cluster of differentiation 98).

Function

SLC3A2 is a member of the solute carrier family and encodes a cell surface, transmembrane protein with an alpha-amylase domain. The protein exists as the heavy chain of a heterodimer, covalently bound through di-sulfide bonds to one of several possible light chains. It associates with integrins and mediates integrin-dependent signaling related to normal cell growth and tumorigenesis. Alternate transcriptional splice variants, encoding different isoforms, have been characterized.

LAT1 is a heterodimeric membrane transport protein that preferentially transports neutral branched (valine, leucine, isoleucine) and aromatic (tryptophan, tyrosine) amino acids. LAT is highly expressed in brain capillaries (which form the blood brain barrier) relative to other tissues.

A functional LAT1 transporter is composed of two proteins encoded by two distinct genes:

• 4F2hc/CD98 heavy subunit protein encoded by the SLC3A2 gene (this gene)
• CD98 light subunit protein encoded by the SLC7A5 gene

Interactions

SLC3A2 has been shown to interact with SLC7A7.

Additionally, SLC3A2 is a constituent member of the system xc- cystine/glutamate antiporter, complexing with SLC7A11.

See also

• Heterodimeric amino acid transporter

Further reading

• "A linkage map of mouse chromosome 19: definition of comparative mapping relationships with human chromosomes 10 and 11 including the MEN1 locus". Genomics 14 (1): 26–31. 1992. doi:10.1016/S0888-7543(05)80278-2. PMID 1358795. 
• "Inhibition of Na+/Ca2+ exchanger activity in cardiac and skeletal muscle sarcolemmal vesicles by monoclonal antibody 44D7". J. Biol. Chem. 261 (1): 92–5. 1986. PMID 2416754. 
• "Isolation and structural characterization of the human 4F2 heavy-chain gene, an inducible gene involved in T-lymphocyte activation". Mol. Cell. Biol. 8 (9): 3809–19. 1989. PMID 3265470. 
• "Regulation of 4F2 heavy-chain gene expression during normal human T-cell activation can be mediated by multiple distinct molecular mechanisms". Mol. Cell. Biol. 8 (9): 3820–6. 1989. PMID 3265471. 
• "Molecular cloning of complementary DNAs encoding the heavy chain of the human 4F2 cell-surface antigen: a type II membrane glycoprotein involved in normal and neoplastic cell growth". Proc. Natl. Acad. Sci. U.S.A. 84 (18): 6526–30. 1987. doi:10.1073/pnas.84.18.6526. PMID 3476959. 
• "Cloning, sequence analysis, and expression of the large subunit of the human lymphocyte activation antigen 4F2". Proc. Natl. Acad. Sci. U.S.A. 84 (24): 9204–8. 1988. doi:10.1073/pnas.84.24.9204. PMID 3480538. 
• "Binding of monoclonal antibody (4F2) to its cell surface antigen on dispersed adenomatous parathyroid cells raises cytosolic calcium and inhibits parathyroid hormone secretion". J. Clin. Endocrinol. Metab. 64 (1): 43–50. 1987. doi:10.1210/jcem-64-1-43. PMID 3782435. 
• "Characterization of antigen recognized by the monoclonal antibody (4F2): different molecular forms on human T and B lymphoblastoid cell lines". J. Immunol. 129 (2): 623–8. 1982. PMID 6177771. 
• "Genetic and biochemical characterization of a human surface determinant on somatic cell hybrids: the 4F2 antigen". Somatic Cell Genet. 8 (6): 825–34. 1983. doi:10.1007/BF01543022. PMID 6187076. 
• "Chromosome mapping of human cell surface molecules: monoclonal anti-human lymphocyte antibodies 4F2, A3D8, and A1G3 define antigens controlled by different regions of chromosome 11". Somatic Cell Genet. 9 (3): 333–44. 1983. doi:10.1007/BF01539142. PMID 6190235. 
• "Characterization of a monoclonal antibody (4F2) that binds to human monocytes and to a subset of activated lymphocytes". J. Immunol. 126 (4): 1409–14. 1981. PMID 7204970. 
• "Molecular characterization of fusion regulatory protein-1 (FRP-1) that induces multinucleated giant cell formation of monocytes and HIV gp160-mediated cell fusion. FRP-1 and 4F2/CD98 are identical molecules". J. Immunol. 155 (7): 3585–92. 1995. PMID 7561057. 
• "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene 138 (1–2): 171–4. 1994. doi:10.1016/0378-1119(94)90802-8. PMID 8125298. 
• "A "double adaptor" method for improved shotgun library construction". Anal. Biochem. 236 (1): 107–13. 1996. doi:10.1006/abio.1996.0138. PMID 8619474. 
• "Regulation of human immunodeficiency virus gp160-mediated cell fusion by antibodies against fusion regulatory protein 1". J. Gen. Virol. 77 (11): 2747–56. 1996. doi:10.1099/0022-1317-77-11-2747. PMID 8922468. 
• "Definition of the minimal MEN1 candidate area based on a 5-Mb integrated map of proximal 11q13. The European Consortium on Men1, (GENEM 1; Groupe d'Etude des Néoplasies Endocriniennes Multiples de type 1)". Genomics 37 (3): 354–65. 1997. doi:10.1006/geno.1996.0570. PMID 8938448. 
• "Large-Scale Concatenation cDNA Sequencing". Genome Res. 7 (4): 353–8. 1997. doi:10.1101/gr.7.4.353. PMID 9110174. 
• "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene 200 (1–2): 149–56. 1997. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149. 
• "Protein tyrosine kinase activation provides an early and obligatory signal in anti-FRP-1/CD98/4F2 monoclonal antibody induced cell fusion mediated by HIV gp160". Med. Microbiol. Immunol. 186 (2–3): 115–23. 1998. doi:10.1007/s004300050053. PMID 9403839. 

External links

• Large+Neutral+Amino+Acid-Transporter+1 at the US National Library of Medicine Medical Subject Headings (MeSH)
• Amino+Acid+Transport+System+L at the US National Library of Medicine Medical Subject Headings (MeSH)

This article incorporates text from the United States National Library of Medicine, which is in the public domain.