KLRB1 (CD161) Proteins

Protein Information

KLRB1 (Killer cell lectin like receptor subfamily B, member 1, CD-161) protein is classified as a type II membrane protein because it has an external C terminus. KLRB1 cell surface antigen is expressed by almost all NK cells and in a small subset of CD3+ve T cells. KLRB1 is a homodimeric cell surface protein, comprising two chains with molecular weights ranging from 40-44kDa. KLRB1 plays an inhibitory role on natural killer (NK) cells. Activation of KLRB1 leads to acid sphingomyelnase/SMPD1 stimulation and an increase in intracellular ceramide. Moreover, there is also an activation of AKT1/PKB and RPS6KA1/RSK1 kinase stimulation, and T cell proliferation by anti-CD3. KLRB1 acts as a lectin that binds to the terminal carbohydrate Gal-alpha(1,3)Gal epitope and to the N-acetyllactosamine epitope. KLRB1 also binds to CLEC2D/LLT1 as a ligand, and inhibits NK cell-mediated cytotoxicity as well as interferon-gamma secretion in target cells. The KLRB1 protein contains an extracellular domain with several motifs characteristic of C-type lectins, a transmembrane domain, and a cytoplasmic domain.

Synonyms

4930431A04Rik; Antigen 3.2.3; CD161; CD161 antigen-like family member A; CD161 antigen-like family member B; CD161a; CD161b; CLEC5B; C-type lectin domain family 5 member B; EMBL:AAQ11375.1}; Gm4696; HNKR-P1a; Immunoreceptor NKR-P1E; immunoreceptor NKR-P1G; inhibitory receptor NKR-P1B; killer cell lectin like receptor B1; killer cell lectin-like receptor subfamily A member 1 complex; killer cell lectin-like receptor subfamily B member 1; killer cell lectin-like receptor subfamily B member 1 complex; killer cell lectin-like receptor subfamily B member 1A; killer cell lectin-like receptor subfamily B member 1B; killer cell lectin-like receptor subfamily B member 1B allele A; Killer cell lectin-like receptor subfamily B member 1B allele B; killer cell lectin-like receptor subfamily B member 1B allele C; killer cell lectin-like receptor subfamily B member 1D; killer cell lectin-like receptor subfamily B member 1F; killer cell lectin-like receptor subfamily B member 1G; killer cell lectin-like receptor subfamily B, member 1; killer cell lectin-like receptor subfamily B, member 1A; Klrb1; Klrb1a; Klrb1b; klrb1b {ECO:0000312; Klrb1d; Klrb1f; Klrb1g; Klrb6; lectin-like transmembrane protein Nkrp1g; Ly55; Ly-55; Ly55a; ly-55A; Ly55b; ly-55b; Ly55d; ly-55d; lymphocyte antigen 55; lymphocyte antigen 55 complex, locus A; lymphocyte antigen 55 complex, locus B; lymphocyte antigen 55 complex, locus D; lymphocyte antigen 55A; lymphocyte antigen 55b; lymphocyte antigen 55d; MGC138614; natural killer cell receptor; natural killer cell receptor protein NKR-P1A; natural killer cell receptor protein NKR-P1B; natural killer cell receptor-P1; natural killer cell surface protein NKR-P1B allele B6; Natural killer cell surface protein NKR-P1B allele RNK/SD/BN/F344; natural killer cell surface protein NKR-P1B allele SJL/BALB; natural killer cell surface protein NKR-P1B allele TO; natural killer cell surface protein NKR-P1G; Natural killer cell surface protein P1-2; natural killer cell surface protein P1-3.2.3; Natural killer cell surface protein P1A; natural killer lectin-like receptor 1E; natural killer lectin-like receptor protein 1 e; NKR; NKR-P1; NKR-P1 2; NKR-P1 3.2.3; NKR-P1 34; NKR-P1.7; NKRP12; NKRP1A; NKR-P1A; Nkrp1-a; Nkrp1b; Nkr-p1b; Nkrp1-b; Nkrp1d; NKR-P1D; Nkrp1e; Nkr-p1e; Nkrp-1e; Nkrp1g; NKR-P1G; RGD:2975}