FABP2

Fatty acid binding protein 2, intestinal
PDB rendering based on 1kzw.
Available structures PDB 1KZW, 1KZX, 3IFB
Identifiers
Symbols	FABP2; FABPI; I-FABP; MGC133132
External IDs	OMIM: 134640 MGI: 95478 HomoloGene: 107 GeneCards: FABP2 Gene
Gene Ontology Molecular function • transporter activity • long-chain fatty acid transporter activity • fatty acid binding Cellular component • cytoplasm • plasma membrane • microvillus • apical cortex Biological process • fatty acid metabolic process • digestion • intestinal absorption Sources: Amigo / QuickGO
RNA expression pattern
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	2169	14079
Ensembl	ENSG00000145384	ENSMUSG00000023057
UniProt	P12104	Q53YP5
RefSeq (mRNA)	NM_000134.3	NM_007980.2
RefSeq (protein)	NP_000125.2	NP_032006.1
Location (UCSC)	Chr 4: 120.24 – 120.24 Mb	Chr 3: 122.6 – 122.6 Mb
PubMed search	[1]	[2]

Fatty acid-binding protein 2 (FABP2) also known as Intestinal-type fatty acid-binding protein (I-FABP) is a protein that in humans is encoded by the FABP2 gene.

Function

The intracellular fatty acid-binding proteins (FABPs) belong to a multigene family with nearly twenty identified members. FABPs are divided into at least three distinct types, namely the hepatic-, intestinal- and cardiac-type. They form 14-15 kDa proteins and are thought to participate in the uptake, intracellular metabolism and/or transport of long-chain fatty acids. They may also be responsible in the modulation of cell growth and proliferation. Intestinal fatty acid-binding protein 2 gene contains four exons and is an abundant cytosolic protein in small intestine epithelial cells.

Clinical significance

This gene has a polymorphism at codon 54 that identified an alanine-encoding allele and a threonine-encoding allele. Thr-54 protein is associated with increased fat oxidation and insulin resistance.

Further reading

• Kaikaus RM, Bass NM, Ockner RK (1990). "Functions of fatty acid binding proteins.". Experientia 46 (6): 617–30. doi:10.1007/BF01939701. PMID 2193826. 
• Glatz JF, Luiken JJ, van Nieuwenhoven FA, Van der Vusse GJ (1997). "Molecular mechanism of cellular uptake and intracellular translocation of fatty acids.". Prostaglandins Leukot. Essent. Fatty Acids 57 (1): 3–9. doi:10.1016/S0952-3278(97)90485-3. PMID 9250601. 
• Storch J, Thumser AE (2000). "The fatty acid transport function of fatty acid-binding proteins.". Biochim. Biophys. Acta 1486 (1): 28–44. PMID 10856711. 
• Edwards A, Hammond HA, Jin L et al. (1992). "Genetic variation at five trimeric and tetrameric tandem repeat loci in four human population groups". Genomics 12 (2): 241–53. doi:10.1016/0888-7543(92)90371-X. PMID 1740333. 
• Polymeropoulos MH, Rath DS, Xiao H, Merril CR (1991). "Trinucleotide repeat polymorphism at the human intestinal fatty acid binding protein gene (FABP2)". Nucleic Acids Res. 18 (23): 7198. doi:10.1093/nar/18.23.7198-a. PMC 332847. PMID 2263509. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=332847. 
• Sweetser DA, Birkenmeier EH, Klisak IJ et al. (1987). "The human and rodent intestinal fatty acid binding protein genes. A comparative analysis of their structure, expression, and linkage relationships". J. Biol. Chem. 262 (33): 16060–71. PMID 2824476. 
• Lowe JB, Boguski MS, Sweetser DA et al. (1985). "Human liver fatty acid binding protein. Isolation of a full length cDNA and comparative sequence analyses of orthologous and paralogous proteins". J. Biol. Chem. 260 (6): 3413–7. PMID 3838313. 
• Baier LJ, Sacchettini JC, Knowler WC et al. (1995). "An amino acid substitution in the human intestinal fatty acid binding protein is associated with increased fatty acid binding, increased fat oxidation, and insulin resistance". J. Clin. Invest. 95 (3): 1281–7. doi:10.1172/JCI117778. PMC 441467. PMID 7883976. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=441467. 
• Goold RD, diSibio GL, Xu H et al. (1993). "The development of sequence-tagged sites for human chromosome 4". Hum. Mol. Genet. 2 (8): 1271–88. doi:10.1093/hmg/2.8.1271. PMID 8401509. 
• Prochazka M, Lillioja S, Tait JF et al. (1993). "Linkage of chromosomal markers on 4q with a putative gene determining maximal insulin action in Pima Indians". Diabetes 42 (4): 514–9. doi:10.2337/diabetes.42.4.514. PMID 8454101. 
• Hegele RA, Harris SB, Hanley AJ et al. (1997). "Genetic variation of intestinal fatty acid-binding protein associated with variation in body mass in aboriginal Canadians". J. Clin. Endocrinol. Metab. 81 (12): 4334–7. doi:10.1210/jc.81.12.4334. PMID 8954037. 
• Zhang F, Lücke C, Baier LJ et al. (1997). "Solution structure of human intestinal fatty acid binding protein: implications for ligand entry and exit". J. Biomol. NMR 9 (3): 213–28. doi:10.1023/A:1018666522787. PMID 9204553. 
• Darimont C, Gradoux N, Cumin F et al. (1998). "Differential regulation of intestinal and liver fatty acid-binding proteins in human intestinal cell line (Caco-2): role of collagen". Exp. Cell Res. 244 (2): 441–7. doi:10.1006/excr.1998.4186. PMID 9806794. 
• Darimont C, Gradoux N, de Pover A (1999). "Epidermal growth factor regulates fatty acid uptake and metabolism in Caco-2 cells". Am. J. Physiol. 276 (3 Pt 1): G606–12. PMID 10070036. 
• Carlsson M, Orho-Melander M, Hedenbro J et al. (2000). "The T 54 allele of the intestinal fatty acid-binding protein 2 is associated with a parental history of stroke". J. Clin. Endocrinol. Metab. 85 (8): 2801–4. doi:10.1210/jc.85.8.2801. PMID 10946885. 
• Chiu KC, Chuang LM, Yoon C (2003). "The A54T polymorphism at the intestinal fatty acid binding protein 2 is associated with insulin resistance in glucose tolerant Caucasians". BMC Genet. 2: 7. doi:10.1186/1471-2156-2-7. PMC 31346. PMID 11299043. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=31346. 
• Makowski L, Boord JB, Maeda K et al. (2001). "Lack of macrophage fatty-acid-binding protein aP2 protects mice deficient in apolipoprotein E against atherosclerosis". Nat. Med. 7 (6): 699–705. doi:10.1038/89076. PMID 11385507.