Von Willebrand factor type A (vWA) domain was originally found in the blood coagulation protein von Willebrand factor (vWF). Typically, the vWA domain is made up of approximately 200 amino acid residues folded into a classic a/b para-rossmann type of fold. The vWA domain, since its discovery, has drawn great interest because of its widespread occurrence and its involvement in a wide variety of important cellular functions. These include basal membrane formation, cell migration, cell differentiation, adhesion, haemostasis, signaling, chromosomal stability, malignant transformation and in immune defenses In integrins these domains form heterodimers while in vWF it forms multimers. There are different interaction surfaces of this domain as seen by the various molecules it complexes with. Ligand binding in most cases is mediated by the presence of a metal ion dependent adhesion site termed as the MIDAS motif that is a characteristic feature of most, if not all A domains.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 268370053 174 QAGQKLEedGRGCEDVDECAVVNGGCQQRCINTLGTFHCECDTGYRRHADERT 226
Cdd:cd01475  174 ELTKKFQ--GKICVVPDLCATLSHVCQQVCISTPGSYLCACTEGYALLEDNKT 224

Von Willebrand factor type A (vWA) domain was originally found in the blood coagulation protein von Willebrand factor (vWF). Typically, the vWA domain is made up of approximately 200 amino acid residues folded into a classic a/b para-rossmann type of fold. The vWA domain, since its discovery, has drawn great interest because of its widespread occurrence and its involvement in a wide variety of important cellular functions. These include basal membrane formation, cell migration, cell differentiation, adhesion, haemostasis, signaling, chromosomal stability, malignant transformation and in immune defenses In integrins these domains form heterodimers while in vWF it forms multimers. There are different interaction surfaces of this domain as seen by the various molecules it complexes with. Ligand binding in most cases is mediated by the presence of a metal ion dependent adhesion site termed as the MIDAS motif that is a characteristic feature of most, if not all A domains.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|..
gi 268370053 270 GKTCIDFDECESGEACCAQLCINYLGGYECSCEEGFQISSDG 311
Cdd:cd01475  181 GKICVVPDLCATLSHVCQQVCISTPGSYLCACTEGYALLEDN 222

VWA_Matrilin: In cartilaginous plate, extracellular matrix molecules mediate cell-matrix and matrix-matrix interactions thereby providing tissue integrity. Some members of the matrilin family are expressed specifically in developing cartilage rudiments. The matrilin family consists of at least four members. All the members of the matrilin family contain VWA domains, EGF-like domains and a heptad repeat coiled-coiled domain at the carboxy terminus which is responsible for the oligomerization of the matrilins. The VWA domains have been shown to be essential for matrilin network formation by interacting with matrix ligands.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 268370053 174 QAGQKLEedGRGCEDVDECAVVNGGCQQRCINTLGTFHCECDTGYRRHADERT 226
Cdd:cd01475  174 ELTKKFQ--GKICVVPDLCATLSHVCQQVCISTPGSYLCACTEGYALLEDNKT 224

Coagulation Factor Xa inhibitory site; This short domain on coagulation enzyme factor Xa is found to be the target for a potent inhibitor of coagulation, TAK-442.

                          10        20        30
                  ....*....|....*....|....*....|....*.
gi 268370053  192 CAVVNGGCQQRCINTLGTFHCECDTGYRRHADERTC 227
Cdd:pfam14670   1 CSVNNGGCSHLCLNTPGGYTCSCPEGYELQDDGRTC 36

VWA_Matrilin: In cartilaginous plate, extracellular matrix molecules mediate cell-matrix and matrix-matrix interactions thereby providing tissue integrity. Some members of the matrilin family are expressed specifically in developing cartilage rudiments. The matrilin family consists of at least four members. All the members of the matrilin family contain VWA domains, EGF-like domains and a heptad repeat coiled-coiled domain at the carboxy terminus which is responsible for the oligomerization of the matrilins. The VWA domains have been shown to be essential for matrilin network formation by interacting with matrix ligands.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 268370053 174 QAGQKLEedGRGCEDVDECAVVNGGCQQRCINTLGTFHCECDTGYRRHADERT 226
Cdd:cd01475  174 ELTKKFQ--GKICVVPDLCATLSHVCQQVCISTPGSYLCACTEGYALLEDNKT 224

Coagulation Factor Xa inhibitory site; This short domain on coagulation enzyme factor Xa is found to be the target for a potent inhibitor of coagulation, TAK-442.

                          10        20        30
                  ....*....|....*....|....*....|....*.
gi 268370053  192 CAVVNGGCQQRCINTLGTFHCECDTGYRRHADERTC 227
Cdd:pfam14670   1 CSVNNGGCSHLCLNTPGGYTCSCPEGYELQDDGRTC 36