Protein Family Annotation Pfam Database Homepage

Chains	Accession	Identifier	Description	Comments	Source
A	PF18362	Tri-helix bundle domain (THB)	Tri-helix bundle domain	This domain can be found in the myosin-binding motif (m-domain) region present in myosin-binding protein C (MyBP-C). MyBP-C is a sarcomeric assembly protein necessary for the regulation of sarcomere structure and function [1]. The MyBP-C family of pr ...	This domain can be found in the myosin-binding motif (m-domain) region present in myosin-binding protein C (MyBP-C). MyBP-C is a sarcomeric assembly protein necessary for the regulation of sarcomere structure and function [1]. The MyBP-C family of proteins consists mainly of modules with immunoglobulin (Ig) or fibronectin folds [2]. This domain exhibits a three-helix bundle fold and there is a known actin-binding motif, LK(R/K)XK positioned in the third helix (alpha3), similar to that found in villin and related proteins [1].	Domain
A	PF02818	PPAK motif (PPAK)	PPAK motif	-	Motif
A	PF00041	Fibronectin type III domain (fn3)	Fibronectin type III domain	-	Domain
A	PF07679	Immunoglobulin I-set domain (I-set)	Immunoglobulin I-set domain	-	Domain
A	PF09042	Titin Z (Titin_Z)	Titin Z	The titin Z domain, that recognises and binds to the C-terminal calmodulin-like domain of alpha-actinin-2 (Act-EF34), adopts a helical structure, and binds in a groove formed by the two planes between the helix pairs of Act-EF34. This interaction is ...	The titin Z domain, that recognises and binds to the C-terminal calmodulin-like domain of alpha-actinin-2 (Act-EF34), adopts a helical structure, and binds in a groove formed by the two planes between the helix pairs of Act-EF34. This interaction is essential for sarcomere assembly [1].	Domain
A	PF00069	Protein kinase domain (Pkinase)	Protein kinase domain	-	Domain

Gene Product Annotation Gene Product Annotation

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Titin	actin binding binding protein binding cytoskeletal protein binding protein-containing complex binding actin filament binding actinin binding calcium ion binding ion binding cation binding metal ion binding calmodulin binding enzyme binding identical protein binding muscle alpha-actinin binding alpha-actinin binding kinase binding protein kinase binding protein self-association catalytic activity protein kinase activity protein serine/threonine kinase activity kinase activity transferase activity transferase activity, transferring phosphorus-containing groups phosphotransferase activity, alcohol group as acceptor catalytic activity, acting on a protein protein tyrosine kinase activity structural molecule activity structural constituent of muscle structural molecule activity conferring elasticity telethonin binding	detection of external stimulus detection of abiotic stimulus response to external stimulus response to mechanical stimulus response to abiotic stimulus response to muscle stretch detection of muscle stretch response to stimulus detection of mechanical stimulus detection of stimulus metabolic process positive regulation of metabolic process gene expression regulation of gene expression positive regulation of macromolecule metabolic process positive regulation of gene expression regulation of metabolic process macromolecule metabolic process positive regulation of biological process regulation of biological process regulation of macromolecule metabolic process biological regulation organic substance metabolic process regulation of catalytic activity regulation of molecular function response to inorganic substance response to metal ion response to chemical response to calcium ion	intracellular anatomical structure cytoplasm cytosol cellular anatomical entity extracellular region extracellular space vesicle organelle membrane-bounded organelle extracellular organelle extracellular exosome extracellular vesicle myofibril sarcomere I band non-membrane-bounded organelle intracellular organelle intracellular non-membrane-bounded organelle contractile fiber supramolecular complex supramolecular polymer supramolecular fiber M band A band cytoskeleton striated muscle thin filament actin cytoskeleton myofilament Z disc

RCSB PDB is funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.