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Integrin, alpha 2 (CD49B, alpha 2 subunit of VLA-2 receptor)
Protein ITGA2 PDB 1aox.png
PDB rendering based on 1aox.
Available structures
PDB Ortholog search: PDBe, RCSB
Symbols ITGA2 ; BR; CD49B; GPIa; HPA-5; VLA-2; VLAA2
External IDs OMIM192974 MGI96600 HomoloGene1662 ChEMBL: 4998 GeneCards: ITGA2 Gene
Species Human Mouse
Entrez 3673 16398
Ensembl ENSG00000164171 ENSMUSG00000015533
UniProt P17301 Q62469
RefSeq (mRNA) NM_002203 NM_008396
RefSeq (protein) NP_002194 NP_032422
Location (UCSC) Chr 5:
52.99 – 53.09 Mb
Chr 13:
114.84 – 114.93 Mb
PubMed search [1] [2]

CD49b (cluster of differentiation 49b) is a protein which in humans is encoded by the CD49b gene.

The CD49b protein is an integrin alpha subunit. It makes up half of the α2β1 integrin duplex. Integrins are heterodimeric integral membrane glycoproteins composed of a distinct alpha chain and a common beta chain. They are found on a wide variety of cell types including, T cells (the NKT cells), NK cells, fibroblasts and platelets. Integrins are involved in cell adhesion and also participate in cell-surface mediated signalling.[1]

DX5 is a monoclonal antibody which binds to CD49b.[2]


CD49b has been shown to interact with MMP1.[3][4]


  1. ^ "Entrez Gene: ITGA2 integrin, alpha 2 (CD49B, alpha 2 subunit of VLA-2 receptor)". 
  2. ^ Arase H, Saito T, Phillips JH, Lanier LL (August 2001). "Cutting edge: the mouse NK cell-associated antigen recognized by DX5 monoclonal antibody is CD49b (alpha 2 integrin, very late antigen-2)". Journal of immunology (Baltimore, Md. : 1950) 167 (3): 1141–4. doi:10.4049/jimmunol.167.3.1141. PMID 11466327. 
  3. ^ Stricker TP, Dumin JA, Dickeson SK, Chung L, Nagase H, Parks WC, Santoro SA (Aug 2001). "Structural analysis of the alpha(2) integrin I domain/procollagenase-1 (matrix metalloproteinase-1) interaction". J. Biol. Chem. 276 (31): 29375–81. doi:10.1074/jbc.M102217200. PMID 11359774. 
  4. ^ Dumin JA, Dickeson SK, Stricker TP, Bhattacharyya-Pakrasi M, Roby JD, Santoro SA, Parks WC (Aug 2001). "Pro-collagenase-1 (matrix metalloproteinase-1) binds the alpha(2)beta(1) integrin upon release from keratinocytes migrating on type I collagen". J. Biol. Chem. 276 (31): 29368–74. doi:10.1074/jbc.M104179200. PMID 11359786. 

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Further reading[edit]

  • Moroi M, Jung SM (1997). "Platelet receptors for collagen.". Thromb. Haemost. 78 (1): 439–44. PMID 9198193. 
  • Takada Y, Kamata T, Irie A, Puzon-McLaughlin W, Zhang XP (1998). "Structural basis of integrin-mediated signal transduction.". Matrix Biol. 16 (4): 143–51. doi:10.1016/S0945-053X(97)90002-0. PMID 9402003. 
  • Dickeson SK, Santoro SA (1998). "Ligand recognition by the I domain-containing integrins.". Cell. Mol. Life Sci. 54 (6): 556–66. doi:10.1007/s000180050184. PMID 9676575. 
  • Porter JC, Hogg N (1999). "Integrins take partners: cross-talk between integrins and other membrane receptors.". Trends Cell Biol. 8 (10): 390–6. doi:10.1016/S0962-8924(98)01344-0. PMID 9789327. 
  • Plenz GA, Deng MC, Robenek H, Völker W (2003). "Vascular collagens: spotlight on the role of type VIII collagen in atherogenesis.". Atherosclerosis 166 (1): 1–11. doi:10.1016/S0021-9150(01)00766-3. PMID 12482545. 
  • Charakida M, Tousoulis D, Stefanadis C, Toutouzas P (2003). "The impact of platelet glycoprotein IIIa and Ia polymorphisms in cardiovascular thrombotic disease.". Italian heart journal : official journal of the Italian Federation of Cardiology 4 (1): 17–22. PMID 12690916. 
  • Tsantes AE, Nikolopoulos GK, Bagos PG, Vaiopoulos G, Travlou A (2007). "Lack of association between the platelet glycoprotein Ia C807T gene polymorphism and coronary artery disease: a meta-analysis.". Int. J. Cardiol. 118 (2): 189–96. doi:10.1016/j.ijcard.2006.06.047. PMID 17023078. 

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