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Protein Page:
B2M (human)
p Phosphorylation
ac Acetylation
me Methylation
m1 Mono-methylation
m2 Di-methylation
m3 Tri-methylation
ub Ubiquitylation
sm Sumoylation
ne Neddylation
gl O-GlcNAc
ga O-GalNAc
pa Palmitoylation
ad Adenylation
sn S-Nitrosylation
ca Caspase cleavage
sc Succinylation

B2M Component of the class I major histocompatibility complex (MHC). Involved in the presentation of peptide antigens to the immune system. Heterodimer of an alpha chain and a beta chain. Beta-2- microglobulin is the beta-chain of major histocompatibility complex class I molecules. Polymers of beta 2-microglobulin can be found in tissues from patients on long-term hemodialysis. Belongs to the beta-2-microglobulin family. Note: This description may include information from UniProtKB.
Protein type: Secreted; Secreted, signal peptide
Chromosomal Location of Human Ortholog: 15q21.1
Cellular Component: cytoplasm; early endosome membrane; endoplasmic reticulum lumen; external side of plasma membrane; extracellular region; extracellular space; focal adhesion; Golgi apparatus; Golgi membrane; membrane; MHC class I protein complex; phagocytic vesicle membrane; plasma membrane
Molecular Function: glycoprotein binding; identical protein binding; protein binding
Biological Process: antibacterial humoral response; antigen processing and presentation of endogenous peptide antigen via MHC class I; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-independent; antigen processing and presentation of exogenous protein antigen via MHC class Ib, TAP-dependent; antigen processing and presentation of peptide antigen via MHC class I; cellular protein metabolic process; defense response to Gram-negative bacterium; defense response to Gram-positive bacterium; innate immune response; iron ion homeostasis; positive regulation of protein binding; positive regulation of receptor-mediated endocytosis; positive regulation of T cell cytokine production; positive regulation of T cell mediated cytotoxicity; protein refolding; regulation of defense response to virus by virus; regulation of immune response; response to cadmium ion; response to drug; retinal homeostasis; T cell differentiation in the thymus
Disease: Hypoproteinemia, Hypercatabolic
Reference #:  P61769 (UniProtKB)
Alt. Names/Synonyms: B2M; B2MG; beta chain of MHC class I molecules; beta-2-microglobin; Beta-2-microglobulin; Beta-2-microglobulin form pI 5.3
Gene Symbols: B2M
Molecular weight: 13,715 Da
Basal Isoelectric point: 6.06  Predict pI for various phosphorylation states
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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Protein Structure Not Found.