Annotations: 9CTU

Cryo-EM structure of SARS-CoV-2 M (short conformation)bound to C1P

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Membrane Protein Annotation: PDBTM

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth F]	Reovirus_L2_GTase	e9ctuF1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Reovirus_L2_GTase	ECOD (v295)
B [auth D]	Gp138_N	e9ctuD01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Gp138_N	ECOD (v295)
C [auth E]	Reovirus_L2_GTase	e9ctuE1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Reovirus_L2_GTase	ECOD (v295)
A [auth C]	Gp138_N	e9ctuC01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Gp138_N	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth D], D [auth F]	Heavy Chain	IGHV1	-	membrane protein	SAbDab (2026-06-26)
A [auth C], C [auth E]	Light Chain	IGKV3	Kappa	membrane protein	SAbDab (2026-06-26)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth A], F [auth B]	Membrane protein	molecular sequestering activity protein sequestering activity structural constituent of virion structural molecule activity identical protein binding protein binding binding	symbiont-mediated perturbation of host defense response symbiont-mediated perturbation of host cellular process symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host pathogen-associated molecular pattern receptor signaling pathway symbiont-mediated perturbation of host immune response biological process involved in interaction with host biological process involved in symbiotic interaction symbiont-mediated suppression of host signal transduction pathway symbiont-mediated suppression of host immune response symbiont-mediated suppression of host innate immune response symbiont-mediated perturbation of host process symbiont-mediated perturbation of host innate immune response symbiont-mediated perturbation of host signal transduction pathway symbiont-mediated perturbation of host defense response symbiont-mediated perturbation of host cellular process symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of MAVS activity biological process involved in interspecies interaction between organisms symbiont-mediated suppression of host pathogen-associated molecular pattern receptor signaling pathway symbiont-mediated perturbation of host immune response biological process involved in interaction with host biological process involved in symbiotic interaction symbiont-mediated suppression of host signal transduction pathway symbiont-mediated suppression of host immune response symbiont-mediated suppression of host innate immune response symbiont-mediated perturbation of host process symbiont-mediated perturbation of host innate immune response symbiont-mediated perturbation of host signal transduction pathway modulation of process of another organism symbiont-mediated suppression of cytoplasmic pattern recognition receptor signaling pathway	cell periphery cellular anatomical structure plasma membrane membrane virion component viral membrane viral envelope virion membrane host cellular component host intracellular part host cell Golgi membrane host cell Golgi apparatus host cell membrane other organism part cell periphery cellular anatomical structure plasma membrane membrane virion component viral membrane viral envelope virion membrane host cellular component host intracellular part host cell Golgi membrane host cell Golgi apparatus host cell membrane other organism part host cell cytoplasm part host cell cytoplasm host cell part host cell endomembrane system host intracellular region
B [auth D], D [auth F]	short conformation Fab heavy chain	-	-	-
A [auth C], C [auth E]	short conformation Fab light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
E [auth A], F [auth B]	IPR002574	M matrix/glycoprotein, coronavirus	Family
E [auth A], F [auth B]	IPR044361	M matrix/glycoprotein, SARS-CoV-like	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
E [auth A], F [auth B]	PDBTM	Annotated as membrane protein by PDBTM

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.