Annotations: 3JAC

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Piezo channel C-terminal extracellular domain-like	8054044	3002270	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Piezo channel C-terminal extracellular domain-like	8054044	3002270	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Piezo channel C-terminal extracellular domain-like	8054044	3002270	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)
B	Piezo_RRas_bdg	e3jacB1	A: beta sandwiches	X: Piezo CTL2 domain (From Topology)	H: Piezo CTL2 domain (From Topology)	T: Piezo CTL2 domain	F: Piezo_RRas_bdg	ECOD (1.6)
C	Piezo_RRas_bdg	e3jacC1	A: beta sandwiches	X: Piezo CTL2 domain (From Topology)	H: Piezo CTL2 domain (From Topology)	T: Piezo CTL2 domain	F: Piezo_RRas_bdg	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C	PF12166	Piezo non-specific cation channel, cap domain (Piezo_cap)	Piezo non-specific cation channel, cap domain	This is an extracellular domain at the C-terminus of Piezo, or FAM38 mechanosensitive non-specific cation channel proteins [1,2]. Piezo is a family of proteins that form mechanosensitive non-specific cation channels whose conductance is higher for Li ...	This is an extracellular domain at the C-terminus of Piezo, or FAM38 mechanosensitive non-specific cation channel proteins [1,2]. Piezo is a family of proteins that form mechanosensitive non-specific cation channels whose conductance is higher for Li+, intermediate for Na+ and lowest for Li+. Divalent ions except for Mn2+ permeate the channel but more slowly than monovalent ions and can reduce K+ currents [1-4]. These channels have a homotrimeric three-blade propeller-shaped structure that use a cap-motion and plug-and-latch mechanism to gate their ion-conducting pathways [2-4]. Each protomer consists of 38 TM helices that form unusual non-planar blades, and an extracellular cap-like structure, the latter represented in this entry [2-4,6]. This domain is embedded in the centre of the trimer and may control the transmembrane constriction site suggested to act as a transmembrane gate [6]. This domain adopts a distinctive beta-sandwich fold [2-6].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	Piezo-type mechanosensitive ion channel component 1	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 gated channel activity mechanosensitive monoatomic cation channel activity mechanosensitive monoatomic ion channel activity identical protein binding protein binding binding	regulation of biological process regulation of cellular process positive regulation of cellular component organization regulation of cellular component organization protein-containing complex organization positive regulation of cellular component biogenesis biological regulation positive regulation of biological process regulation of cellular component biogenesis cellular component organization cellular component biogenesis positive regulation of protein-containing complex assembly regulation of protein-containing complex assembly cellular component assembly protein-containing complex assembly regulation of biological process regulation of cellular process positive regulation of cellular component organization regulation of cellular component organization protein-containing complex organization positive regulation of cellular component biogenesis biological regulation positive regulation of biological process regulation of cellular component biogenesis cellular component organization cellular component biogenesis positive regulation of protein-containing complex assembly regulation of protein-containing complex assembly cellular component assembly protein-containing complex assembly regulation of integrin activation cellular process cellular component organization or biogenesis integrin activation positive regulation of integrin activation positive regulation of cellular process cellular developmental process regulation of developmental process regulation of cell differentiation regulation of striated muscle cell differentiation muscle cell differentiation myotube differentiation muscle structure development positive regulation of developmental process positive regulation of myotube differentiation positive regulation of cell differentiation cell differentiation positive regulation of striated muscle cell differentiation regulation of myotube differentiation anatomical structure development developmental process positive regulation of muscle cell differentiation regulation of muscle cell differentiation striated muscle cell differentiation regulation of biological quality regulation of membrane potential cell-cell adhesion mediated by integrin positive regulation of cell adhesion mediated by integrin positive regulation of cell adhesion regulation of cell adhesion regulation of cell adhesion mediated by integrin regulation of cell-cell adhesion mediated by integrin positive regulation of cell-cell adhesion positive regulation of cell-cell adhesion mediated by integrin cell adhesion cell-cell adhesion cell adhesion mediated by integrin regulation of cell-cell adhesion detection of external stimulus detection of stimulus response to stimulus detection of mechanical stimulus response to mechanical stimulus response to external stimulus response to abiotic stimulus detection of abiotic stimulus localization transport monoatomic ion transport monoatomic cation transport establishment of localization	membrane-bounded organelle intracellular anatomical structure membrane intracellular membrane-bounded organelle intracellular organelle bounding membrane of organelle cellular anatomical structure organelle endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment cytoplasm organelle membrane cell periphery plasma membrane membrane-bounded organelle intracellular anatomical structure membrane intracellular membrane-bounded organelle intracellular organelle bounding membrane of organelle cellular anatomical structure organelle endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment cytoplasm organelle membrane cell periphery plasma membrane cell projection stereocilium actin-based cell projection stereocilium bundle neuron projection cluster of actin-based cell projections plasma membrane bounded cell projection cell cortex cuticular plate cortical cytoskeleton intracellular membraneless organelle actin cytoskeleton cytoskeleton membraneless organelle cortical actin cytoskeleton endoplasmic reticulum endomembrane system organelle subcompartment endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum membrane cell leading edge leading edge membrane plasma membrane region lamellipodium membrane cell projection membrane lamellipodium

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C	IPR031334	Piezo non-specific cation channel, cap domain	Domain
A, B, C	IPR031805	Piezo, TM25-28	Domain
A, B, C	IPR027272	Piezo family	Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Channels: Mechanosensitive	Piezo1 mechanosensitive channel by cryo-EM

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.