Human OCIL/CLEC2d Antibody

Human OCIL (osteoclast inhibitory lectin; also LLT1 and CLEC-2D) is a member of the NK cell receptor group of the C-type lectin superfamily. It is a type II transmembrane protein 191 amino acids (aa) in length that contains a C-terminal 132 aa extracellular domain (ECD). Within the ECD lies a C-type lectin domain (aa 75-186). There are at least two alternate splice forms of OCIL. Both exhibit splicing in the ECD. One shows a 40 aa substitution for the C-terminal 37 amino acids. A second shows a 3 aa substitution for the C-terminal 72 amino acids. The ECD of human OCIL is 49% and 50% aa identical to the ECD in mouse and rat OCIL ECD, respectively. The molecule is found on hematopoietic cells, osteoblasts and chondrocytes. It binds sulfated GAGs and NKR-P1B and D receptors, and blocks osteoclast formation.