Annotations: 8RML

Structure of heteromeric CALHM2/4 channel in complex with synthetic nanobody SbC4

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
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)
B [auth L]	Pro_isomerase	e8rmlL01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Pro_isomerase	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth L], M	Heavy Chain	IGHV1	-	calcium homeostasis modulator protein 4	SAbDab (2026-06-26)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], I [auth H], J [auth I], K [auth J]	Calcium homeostasis modulator protein 2	monoatomic cation transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity	regulation of biological process positive regulation of programmed cell death regulation of cellular process regulation of apoptotic process biological regulation positive regulation of biological process regulation of programmed cell death cell death positive regulation of apoptotic process cellular process apoptotic process programmed cell death positive regulation of cellular process localization regulation of biological process positive regulation of programmed cell death regulation of cellular process regulation of apoptotic process biological regulation positive regulation of biological process regulation of programmed cell death cell death positive regulation of apoptotic process cellular process apoptotic process programmed cell death positive regulation of cellular process localization transport monoatomic ion transport calcium ion import monoatomic cation transport establishment of localization calcium ion transport metal ion transport ATP transport nitrogen compound transport nucleotide transport purine ribonucleotide transport carbohydrate derivative transport purine nucleotide transport adenine nucleotide transport ATP export nucleobase-containing compound transport organophosphate ester transport regulation of macrophage activation multicellular organismal process regulation of defense response response to stimulus regulation of response to external stimulus regulation of leukocyte activation regulation of cell activation myeloid leukocyte activation leukocyte activation macrophage activation response to stress regulation of response to stress leukocyte activation involved in inflammatory response regulation of neuroinflammatory response regulation of immune system process regulation of multicellular organismal process defense response cell activation regulation of inflammatory response response to external stimulus regulation of response to stimulus immune system process microglial cell activation regulation of microglial cell activation inflammatory response glial cell activation neuroinflammatory response regulation of synaptic plasticity trans-synaptic signaling regulation of signaling modulation of chemical synaptic transmission signaling cell-cell signaling chemical synaptic transmission cell communication synaptic signaling regulation of trans-synaptic signaling anterograde trans-synaptic signaling regulation of cell communication regulation of biological quality	cell periphery cellular anatomical structure plasma membrane membrane
B [auth L], M	Synthetic nanobody SbC4	-	-	-
A, C [auth B], L [auth K]	Calcium homeostasis modulator protein 4	monoatomic cation transmembrane transporter activity monoatomic cation channel activity passive transmembrane transporter activity monoatomic ion channel activity channel activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity	ATP transport nitrogen compound transport nucleotide transport transport purine ribonucleotide transport carbohydrate derivative transport establishment of localization purine nucleotide transport adenine nucleotide transport localization ATP export nucleobase-containing compound transport organophosphate ester transport	cell periphery cellular anatomical structure plasma membrane membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], I [auth H], J [auth I], K [auth J]	IPR029569	Calcium homeostasis modulator family	Family
A, C [auth B], L [auth K]	IPR029569	Calcium homeostasis modulator family	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], I [auth H], J [auth I], K [auth J]	: Q9HA72	atrial fibrillation malignant mesothelioma ovarian cancer psoriasis attention deficit hyperactivity disorder, inattentive type non-small cell lung carcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia cystic fibrosis osteosarcoma pituitary cancer
A, C [auth B], L [auth K]	: Q5JW98	nephrotic syndrome ulcerative colitis

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, C [auth B], D [auth C], E [auth D], F [auth E] A, C [auth B], D [auth C], E [auth D], F [auth E], G [auth F], H [auth G], I [auth H], J [auth I], K [auth J], L [auth K]	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.