6SB5

CryoEM structure of murine perforin-2 ectodomain in a pore form

External Resource: Annotation

Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: PDBTM

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P	PF01823	MAC/Perforin domain (MACPF)	MAC/Perforin domain	The membrane-attack complex (MAC) of the complement system forms transmembrane channels. These channels disrupt the phospholipid bilayer of target cells, leading to cell lysis and death. A number of proteins participate in the assembly of the MAC. Fr ...	The membrane-attack complex (MAC) of the complement system forms transmembrane channels. These channels disrupt the phospholipid bilayer of target cells, leading to cell lysis and death. A number of proteins participate in the assembly of the MAC. Freshly activated C5b binds to C6 to form a C5b-6 complex, then to C7 forming the C5b-7 complex. The C5b-7 complex binds to C8, which is composed of three chains (alpha, beta, and gamma), thus forming the C5b-8 complex. C5b-8 subsequently binds to C9 and acts as a catalyst in the polymerisation of C9. Active MAC has a subunit composition of C5b-C6-C7-C8-C9{n}. Perforin is a protein found in cytolytic T-cell and killer cells. In the presence of calcium, perforin polymerises into transmembrane tubules and is capable of lysing, non-specifically, a variety of target cells. There are a number of regions of similarity in the sequences of complement components C6, C7, C8-alpha, C8-beta, C9 and perforin. The X-ray crystal structure of a MACPF domain reveals that it shares a common fold with bacterial cholesterol dependent cytolysins (Pfam:PF01289) such as perfringolysin O. Three key pieces of evidence suggests that MACPF domains and CDCs are homologous: Functional similarity (pore formation), conservation of three glycine residues at a hinge in both families and conservation of a complex core fold [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P	Macrophage-expressed gene 1 protein	wide pore channel activity passive transmembrane transporter activity channel activity transporter activity transmembrane transporter activity pore-forming activity	response to stimulus immune response immune system process adaptive immune response antigen processing and presentation antigen processing and presentation of exogenous peptide antigen antigen processing and presentation of peptide antigen antigen processing and presentation of exogenous antigen dendritic cell antigen processing and presentation biological process involved in interspecies interaction between organisms response to other organism defense response response to external stimulus defense response to Gram-negative bacterium response to stimulus immune response immune system process adaptive immune response antigen processing and presentation antigen processing and presentation of exogenous peptide antigen antigen processing and presentation of peptide antigen antigen processing and presentation of exogenous antigen dendritic cell antigen processing and presentation biological process involved in interspecies interaction between organisms response to other organism defense response response to external stimulus defense response to Gram-negative bacterium response to biotic stimulus defense response to bacterium defense response to other organism response to stress response to bacterium response to external biotic stimulus antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of exogenous peptide antigen via MHC class I defense response to Gram-positive bacterium defense response to symbiont antibacterial innate immune response innate immune response	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm intracellular membrane-bounded organelle vesicle membrane phagocytic vesicle phagocytic vesicle membrane cytoplasmic vesicle membrane membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure cytoplasmic vesicle organelle intracellular vesicle cytoplasm intracellular membrane-bounded organelle vesicle membrane phagocytic vesicle phagocytic vesicle membrane cytoplasmic vesicle membrane bounding membrane of organelle vesicle membrane endocytic vesicle membrane organelle membrane endocytic vesicle endosome lytic vacuole vacuole endomembrane system endolysosome lysosome phagolysosome vacuolar membrane phagolysosome membrane lytic vacuole membrane lysosomal membrane secondary lysosome

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P	IPR020864	Membrane attack complex component/perforin (MACPF) domain	Domain
A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P	IPR039707	Macrophage-expressed gene 1 protein	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P	PDBTM	Annotated as membrane protein by PDBTM

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729.