Domain Annotation: SCOP Classification SCOP Database (version: 2.0) Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species
B	d3cchb_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	beta2-microglobulin	mouse (Mus musculus ) [TaxId: 10090 ]
E	d3cche_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	beta2-microglobulin	mouse (Mus musculus ) [TaxId: 10090 ]
H	d3cchh_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	beta2-microglobulin	mouse (Mus musculus ) [TaxId: 10090 ]
K	d3cchk_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	beta2-microglobulin	mouse (Mus musculus ) [TaxId: 10090 ]

Domain Annotation: CATH CATH Database (version 4.2.0) Homepage

Chain	Domain	Class	Architecture	Topology	Homology
A	3.30.500.10	Alpha Beta	2-Layer Sandwich	Murine Class I Major Histocompatibility Complex, H2-DB	Chain A, domain 1
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
D	3.30.500.10	Alpha Beta	2-Layer Sandwich	Murine Class I Major Histocompatibility Complex, H2-DB	Chain A, domain 1
D	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
G	3.30.500.10	Alpha Beta	2-Layer Sandwich	Murine Class I Major Histocompatibility Complex, H2-DB	Chain A, domain 1
G	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
J	3.30.500.10	Alpha Beta	2-Layer Sandwich	Murine Class I Major Histocompatibility Complex, H2-DB	Chain A, domain 1
J	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
E	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
H	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins
K	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Identifier	Description	Comments	Source
A, D, G, J	PF00129	Class I Histocompatibility antigen, domains alpha 1 and 2 (MHC_I)	Class I Histocompatibility antigen, domains alpha 1 and 2	-	Domain
A, D, G, J	PF06623	MHC_I C-terminus (MHC_I_C)	MHC_I C-terminus	-	Family
A, D, G, J	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain	-	Domain
B, E, H, K	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain	-	Domain

Gene Product Annotation Gene Product Annotation

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, D, G, J	H-2 class I histocompatibility antigen, D-B alpha chain	binding protein binding beta-2-microglobulin binding signaling receptor binding CD8 receptor binding antigen binding amide binding peptide binding peptide antigen binding protein-containing complex binding T cell receptor binding TAP binding TAP complex binding		cell surface cellular anatomical entity intracellular anatomical structure cytoplasm endoplasmic reticulum endomembrane system organelle membrane-bounded organelle intracellular organelle intracellular membrane-bounded organelle endoplasmic reticulum exit site plasma membrane external side of plasma membrane membrane cell periphery side of membrane extracellular region extracellular space Golgi apparatus Golgi stack Golgi medial cisterna organelle subcompartment Golgi cisterna Golgi apparatus subcompartment endoplasmic reticulum membrane integral component of membrane integral component of endoplasmic reticulum membrane organelle membrane intrinsic component of membrane intrinsic component of endoplasmic reticulum membrane intrinsic component of organelle membrane integral component of organelle membrane nuclear outer membrane-endoplasmic reticulum membrane network integral component of lumenal side of endoplasmic reticulum membrane lumenal side of endoplasmic reticulum membrane lumenal side of membrane endoplasmic reticulum subcompartment protein-containing complex MHC class I peptide loading complex membrane protein complex endoplasmic reticulum protein-containing complex MHC protein complex MHC class I protein complex plasma membrane protein complex vesicle membrane endocytic vesicle cytoplasmic vesicle membrane endocytic vesicle membrane phagocytic vesicle membrane cytoplasmic vesicle vesicle phagocytic vesicle intracellular vesicle bounding membrane of organelle
B, E, H, K	Beta-2-microglobulin	binding protein binding identical protein binding protein homodimerization activity protein dimerization activity	cellular process response to inorganic substance response to metal ion response to iron ion response to chemical response to stimulus cellular response to stimulus cellular response to chemical stimulus cellular response to inorganic substance cellular response to metal ion cellular response to iron ion response to iron(III) ion cellular response to iron(III) ion response to nicotine cellular response to nicotine homeostatic process chemical homeostasis ion homeostasis metal ion homeostasis iron ion homeostasis transition metal ion homeostasis cation homeostasis biological regulation regulation of biological quality inorganic ion homeostasis cell population proliferation negative regulation of cell population proliferation regulation of cell population proliferation negative regulation of biological process negative regulation of cellular process epithelial cell proliferation regulation of epithelial cell proliferation negative regulation of epithelial cell proliferation regulation of biological process regulation of cellular process negative regulation of protein binding regulation of protein binding negative regulation of molecular function regulation of binding negative regulation of binding regulation of molecular function regulation of receptor binding negative regulation of receptor binding positive regulation of molecular function positive regulation of binding regulation of ferrous iron binding positive regulation of ferrous iron binding positive regulation of protein binding positive regulation of receptor binding regulation of transferrin receptor binding positive regulation of transferrin receptor binding cellular component organization cellular component assembly protein-containing complex subunit organization cellular component biogenesis protein complex oligomerization protein homooligomerization protein tetramerization protein homotetramerization protein-containing complex assembly cellular component organization or biogenesis response to cadmium ion response to drug	intracellular anatomical structure cytoplasm cytosol cellular anatomical entity plasma membrane external side of plasma membrane cell surface membrane cell periphery side of membrane extracellular region extracellular space Golgi apparatus endomembrane system organelle membrane-bounded organelle intracellular organelle intracellular membrane-bounded organelle protein-containing complex receptor complex membrane protein complex plasma membrane protein complex plasma membrane signaling receptor complex HFE-transferrin receptor complex endoplasmic reticulum endoplasmic reticulum membrane integral component of membrane integral component of endoplasmic reticulum membrane organelle membrane intrinsic component of membrane intrinsic component of endoplasmic reticulum membrane intrinsic component of organelle membrane integral component of organelle membrane organelle subcompartment nuclear outer membrane-endoplasmic reticulum membrane network MHC class I peptide loading complex endoplasmic reticulum subcompartment endoplasmic reticulum protein-containing complex MHC protein complex MHC class I protein complex vesicle membrane endocytic vesicle cytoplasmic vesicle membrane endocytic vesicle membrane phagocytic vesicle membrane cytoplasmic vesicle vesicle phagocytic vesicle intracellular vesicle bounding membrane of organelle
C, F, I, L	nonameric peptide murine gp100	none	none	none

RCSB PDB is funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.