6I7S

Microsomal triglyceride transfer protein

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Thioredoxin-like	8058568	3000031	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Thioredoxin-like	8058567	3000031	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Thioredoxin-like	8058574	3000031	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Thioredoxin-like	8058576	3000031	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Thioredoxin-like	8058567	3000031	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Thioredoxin-like	8058574	3000031	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Thioredoxin-like	8058576	3000031	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Thioredoxin-like	8058568	3000031	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Thioredoxin	e6i7sA2	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin	ECOD (1.6)
A	Thioredoxin_6_N	e6i7sA1	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin_6_N	ECOD (1.6)
A	Thioredoxin_6_C	e6i7sA3	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin_6_C	ECOD (1.6)
B	Thioredoxin	e6i7sB3	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin	ECOD (1.6)
B	Thioredoxin_6_N	e6i7sB1	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin_6_N	ECOD (1.6)
B	Thioredoxin_6_C	e6i7sB2	A: a+b three layers	X: Thioredoxin-like	H: Thioredoxin-like (From Topology)	T: Thioredoxin-like	F: Thioredoxin_6_C	ECOD (1.6)
C [auth G]	Vitellogenin_N_1st	e6i7sG1	A: beta meanders	X: Lipovitellin-phosvitin complex	H: Lipovitellin LV-1N (From Topology)	T: Lipovitellin LV-1N	F: Vitellogenin_N_1st	ECOD (1.6)
C [auth G]	UNK_F_TYPE	e6i7sG3	A: beta meanders	X: Lipovitellin-phosvitin complex	H: Lipovitellin LV-1C (From Topology)	T: Lipovitellin LV-1C	F: UNK_F_TYPE	ECOD (1.6)
C [auth G]	Vitellogenin_N_2nd	e6i7sG2	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: Vitellogenin_N_2nd	ECOD (1.6)
D [auth H]	Vitellogenin_N_1st	e6i7sH2	A: beta meanders	X: Lipovitellin-phosvitin complex	H: Lipovitellin LV-1N (From Topology)	T: Lipovitellin LV-1N	F: Vitellogenin_N_1st	ECOD (1.6)
D [auth H]	UNK_F_TYPE	e6i7sH3	A: beta meanders	X: Lipovitellin-phosvitin complex	H: Lipovitellin LV-1C (From Topology)	T: Lipovitellin LV-1C	F: UNK_F_TYPE	ECOD (1.6)
D [auth H]	Vitellogenin_N_2nd	e6i7sH1	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: Vitellogenin_N_2nd	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF13848	Thioredoxin-like domain (Thioredoxin_6)	Thioredoxin-like domain	-	Domain
A, B	PF00085	Thioredoxin (Thioredoxin)	Thioredoxin	Thioredoxins are small enzymes that participate in redox reactions, via the reversible oxidation of an active centre disulfide bond. Some members with only the active site are not separated from the noise.	Domain
C [auth G], D [auth H]	PF19444	MTP large subunit, lipid-binding domain (MTP_lip_bd)	MTP large subunit, lipid-binding domain	Microsomal triglyceride transfer protein (MTP) is essential in lipid metabolism, especially in the biogenesis of very low-density lipoproteins and chylomicrons via the transfer of neutral lipids and the assembly of apoB-containing lipoproteins. It is ...	Microsomal triglyceride transfer protein (MTP) is essential in lipid metabolism, especially in the biogenesis of very low-density lipoproteins and chylomicrons via the transfer of neutral lipids and the assembly of apoB-containing lipoproteins. It is a heterodimer consisting of a large MTP alpha-subunit and a protein disulfide isomerase (PDI) beta-subunit. The MTP large subunit has and N-terminal beta-barrel domain, a central alpha-helical domain and a C-terminal 2-beta-sheet domain. This is the highly conserved MTP C-terminal domain involved in lipid-binding and transfer activity, with preference of neutral 3 chain-containing lipids. The beta-sheets are named A and C and form a sandwich comprising the lipid-binding site between them. Half of the A-sheet interacts with the beta-barrel. This domain also interacts with a' and b' domains of PDI [1].	Domain
C [auth G], D [auth H]	PF01347	Lipoprotein amino terminal region (Vitellogenin_N)	Lipoprotein amino terminal region	-	Repeat

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Protein disulfide-isomerase	oxidoreductase activity, acting on a sulfur group of donors disulfide oxidoreductase activity oxidoreductase activity oxidoreductase activity, acting on a sulfur group of donors, oxygen as acceptor thiol oxidase activity catalytic activity isomerase activity intramolecular oxidoreductase activity catalytic activity, acting on a protein intramolecular oxidoreductase activity, transposing S-S bonds protein disulfide isomerase activity protein heterodimerization activity protein binding binding oxidoreductase activity, acting on a sulfur group of donors disulfide oxidoreductase activity oxidoreductase activity oxidoreductase activity, acting on a sulfur group of donors, oxygen as acceptor thiol oxidase activity catalytic activity isomerase activity intramolecular oxidoreductase activity catalytic activity, acting on a protein intramolecular oxidoreductase activity, transposing S-S bonds protein disulfide isomerase activity protein heterodimerization activity protein binding binding protein dimerization activity RNA binding organic cyclic compound binding nucleic acid binding cell adhesion molecule binding protein-containing complex binding integrin binding signaling receptor binding cytoskeletal protein binding actin binding protein-disulfide reductase activity peptidyl-proline 4-dioxygenase activity oxidoreductase activity, acting on paired donors, with incorporation or reduction of molecular oxygen procollagen-proline dioxygenase activity peptidyl-proline dioxygenase activity 2-oxoglutarate-dependent dioxygenase activity procollagen-proline 4-dioxygenase activity dioxygenase activity enzyme binding	cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus cell surface receptor signaling pathway signaling biological regulation response to cytokine cytokine-mediated signaling pathway cell communication response to peptide interleukin-23-mediated signaling pathway response to chemical cellular response to cytokine stimulus cellular response to stimulus regulation of biological process regulation of cellular process response to stimulus cell surface receptor signaling pathway signaling biological regulation response to cytokine cytokine-mediated signaling pathway cell communication response to peptide interleukin-23-mediated signaling pathway response to chemical cellular response to cytokine stimulus cellular process signal transduction protein folding biosynthetic process metabolic process primary metabolic process protein metabolic process macromolecule metabolic process gene expression macromolecule biosynthetic process protein maturation response to decreased oxygen levels cellular response to oxygen levels cellular response to hypoxia cellular response to decreased oxygen levels cellular response to chemical stimulus cellular response to stress response to hypoxia response to stress response to oxygen levels response to abiotic stimulus cellular response to interleukin-12 response to interleukin-12 interleukin-12-mediated signaling pathway protein folding in endoplasmic reticulum intrinsic apoptotic signaling pathway in response to oxidative stress regulation of oxidative stress-induced intrinsic apoptotic signaling pathway regulation of signal transduction regulation of programmed cell death regulation of intrinsic apoptotic signaling pathway intracellular signal transduction regulation of intracellular signal transduction intrinsic apoptotic signaling pathway regulation of signaling regulation of apoptotic process cell death apoptotic signaling pathway regulation of response to stimulus regulation of cell communication apoptotic process programmed cell death regulation of apoptotic signaling pathway positive regulation of substrate adhesion-dependent cell spreading regulation of cell-substrate adhesion positive regulation of cell adhesion regulation of substrate adhesion-dependent cell spreading regulation of cell adhesion positive regulation of biological process cell-substrate adhesion cell adhesion positive regulation of cell-substrate adhesion substrate adhesion-dependent cell spreading positive regulation of cellular process localization cellular localization transport establishment of localization in cell intracellular transport endoplasmic reticulum to Golgi vesicle-mediated transport establishment of localization Golgi vesicle transport vesicle-mediated transport peptide hormone processing regulation of hormone levels signaling receptor ligand precursor processing hormone metabolic process insulin processing proteolysis protein processing amide metabolic process regulation of biological quality insulin metabolic process biological process involved in interspecies interaction between organisms positive regulation of viral life cycle positive regulation of viral process viral life cycle modulation by symbiont of entry into host biological process involved in interaction with host biological process involved in symbiotic interaction regulation of viral entry into host cell regulation of viral life cycle regulation of viral process symbiont entry into host cell viral process symbiont entry into host positive regulation of viral entry into host cell positive regulation by symbiont of entry into host regulation of biological process involved in symbiotic interaction 4-hydroxyproline metabolic process oxoacid metabolic process carboxylic acid metabolic process modified amino acid metabolic process amino acid metabolic process organic acid metabolic process alpha-amino acid metabolic process L-amino acid metabolic process non-proteinogenic amino acid metabolic process macromolecule modification peptidyl-proline hydroxylation peptidyl-amino acid modification protein hydroxylation peptidyl-proline hydroxylation to 4-hydroxy-L-proline small molecule metabolic process peptidyl-proline modification protein modification process response to interleukin-7 cellular response to interleukin-7 response to endoplasmic reticulum stress	cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell projection cell leading edge plasma membrane bounded cell projection lamellipodium cell periphery cell surface membrane plasma membrane external side of plasma membrane cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction cell projection cell leading edge plasma membrane bounded cell projection lamellipodium cell periphery cell surface membrane plasma membrane external side of plasma membrane side of membrane membrane-bounded organelle intracellular anatomical structure pigment granule intracellular vesicle intracellular membrane-bounded organelle intracellular organelle melanosome cytoplasmic vesicle organelle cytoplasm vesicle extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space extracellular membrane-bounded organelle cytosol protein-containing complex catalytic complex endomembrane system endoplasmic reticulum procollagen-proline 4-dioxygenase complex oxidoreductase complex endoplasmic reticulum protein-containing complex cytoskeleton membraneless organelle intracellular membraneless organelle membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum-Golgi intermediate compartment endoplasmic reticulum chaperone complex
C [auth G], D [auth H]	Microsomal triglyceride transfer protein large subunit	phospholipid transfer activity lipid transporter activity lipid transfer activity transporter activity phospholipid transporter activity sphingolipid transfer activity sphingolipid transporter activity ceramide transfer activity ceramide 1-phosphate transfer activity apolipoprotein binding protein binding binding protein heterodimerization activity protein dimerization activity phospholipid transfer activity lipid transporter activity lipid transfer activity transporter activity phospholipid transporter activity sphingolipid transfer activity sphingolipid transporter activity ceramide transfer activity ceramide 1-phosphate transfer activity apolipoprotein binding protein binding binding protein heterodimerization activity protein dimerization activity sterol transfer activity cholesterol transfer activity phosphatidylcholine transporter activity phosphatidylcholine transfer activity phosphatidylethanolamine transfer activity lipid binding protein-containing complex binding triglyceride transfer activity	rhythmic process circadian rhythm plasma lipoprotein particle organization multicellular organismal process regulation of biological process low-density lipoprotein particle remodeling protein-containing complex organization protein-containing complex remodeling protein-lipid complex organization biological regulation plasma lipoprotein particle remodeling regulation of plasma lipoprotein particle levels cellular component organization protein-lipid complex remodeling rhythmic process circadian rhythm plasma lipoprotein particle organization multicellular organismal process regulation of biological process low-density lipoprotein particle remodeling protein-containing complex organization protein-containing complex remodeling protein-lipid complex organization biological regulation plasma lipoprotein particle remodeling regulation of plasma lipoprotein particle levels cellular component organization protein-lipid complex remodeling cellular process cellular component organization or biogenesis response to stimulus response to metal ion response to chemical response to calcium ion chylomicron assembly cellular component biogenesis cellular component assembly protein-containing complex assembly plasma lipoprotein particle assembly protein-lipid complex assembly localization transport macromolecule localization phospholipid transport lipid localization lipid transport establishment of localization organophosphate ester transport sterol homeostasis chemical homeostasis homeostatic process cholesterol homeostasis lipid homeostasis primary metabolic process metabolic process lipid metabolic process cellular localization establishment of localization in cell protein localization establishment of protein localization nitrogen compound transport lipoprotein transport protein transport cellular macromolecule localization lipoprotein localization lipoprotein metabolic process protein metabolic process macromolecule metabolic process very-low-density lipoprotein particle assembly secretion establishment of protein localization to extracellular region export from cell protein secretion protein localization to extracellular region secretion by cell neutral lipid metabolic process triglyceride metabolic process glycerolipid metabolic process acylglycerol metabolic process acylglycerol transport triglyceride transport	membrane-bounded organelle cellular anatomical structure organelle vesicle intracellular anatomical structure cytoplasm cytosol membrane plasma membrane plasma membrane bounded cell projection cell periphery cell projection actin-based cell projection plasma membrane region membrane-bounded organelle cellular anatomical structure organelle vesicle intracellular anatomical structure cytoplasm cytosol membrane plasma membrane plasma membrane bounded cell projection cell periphery cell projection actin-based cell projection plasma membrane region microvillus microvillus membrane cell projection membrane basal part of cell basal plasma membrane basolateral plasma membrane protein-containing complex receptor complex intracellular organelle Golgi apparatus intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum brush border membrane cluster of actin-based cell projections brush border

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR017937	Thioredoxin, conserved site	Conserved Site
A, B	IPR005788	Protein disulfide-isomerase, thioredoxin-like domain	Domain
A, B	IPR005792	Protein disulphide isomerase	Family
A, B	IPR013766	Thioredoxin domain	Domain
A, B	IPR036249	Thioredoxin-like superfamily	Homologous Superfamily
C [auth G], D [auth H]	IPR011030	Lipovitellin-phosvitin complex, superhelical domain	Homologous Superfamily
C [auth G], D [auth H]	IPR015816	Vitellinogen, beta-sheet N-terminal	Homologous Superfamily
C [auth G], D [auth H]	IPR045811	MTP large subunit, lipid-binding domain	Domain
C [auth G], D [auth H]	IPR001747	Vitellogenin, N-terminal	Domain
C [auth G], D [auth H]	IPR015819	Lipid transport protein, beta-sheet shell	Homologous Superfamily
C [auth G], D [auth H]	IPR039988	Microsomal triglyceride transfer protein large subunit	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P07237	Cole-Carpenter syndrome osteogenesis imperfecta Cole-Carpenter syndrome 1 spinocerebellar ataxia type 17 osteoporosis craniosynostosis prostate cancer malignant pancreatic neoplasm myocardial ischemia oligodendroglioma astrocytic tumor osteosarcoma pancreatic intraductal papillary-mucinous carcinoma chronic obstructive pulmonary disease pilocytic astrocytoma Cole-Carpenter syndrome osteogenesis imperfecta Cole-Carpenter syndrome 1 spinocerebellar ataxia type 17 osteoporosis craniosynostosis prostate cancer malignant pancreatic neoplasm myocardial ischemia oligodendroglioma astrocytic tumor osteosarcoma pancreatic intraductal papillary-mucinous carcinoma chronic obstructive pulmonary disease pilocytic astrocytoma coronary artery disease Post-Traumatic Osteoporosis drug-induced liver injury intellectual disability lung adenocarcinoma malignant glioma medulloblastoma myopathy osteochondrodysplasia atypical teratoid rhabdoid tumor ovarian cancer pancreatic intraductal papillary-mucinous neoplasm pituitary cancer primitive neuroectodermal tumor glioblastoma psoriasis invasive ductal breast carcinoma lung cancer malignant mesothelioma mucopolysaccharidosis type 4 non-small cell lung carcinoma pancreatic ductal adenocarcinoma breast cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia plasma cell myeloma diabetes mellitus hydrocephalus large cell medulloblastoma malignant ependymoma
C [auth G], D [auth H]	Pharos: P55157	abetalipoproteinemia metabolic syndrome X abdominal obesity-metabolic syndrome Ataxias, Hereditary inherited lipid metabolism disorder malignant glioma pancreatic ductal adenocarcinoma Charcot-Marie-Tooth disease fatty liver disease hypolipoproteinemia intellectual disability glioblastoma inborn errors of metabolism malignant ependymoma

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C [auth G], D [auth H]	OPM	Monotopic/peripheral	Alpha + Beta monotopic/peripheral	Apolipoprotein of LDL particles	Vitellogenin

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.