3D1B | pdb_00003d1b

Tetragonal crystal structure of Tas3 C-terminal alpha motif

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	EUF07932	e3d1bC2	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07932	ECOD (1.6)
C	EUF07933	e3d1bC1	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07933	ECOD (1.6)
B	EUF07932	e3d1bB2	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07932	ECOD (1.6)
B	EUF07933	e3d1bB1	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07933	ECOD (1.6)
A	EUF07932	e3d1bA2	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07932	ECOD (1.6)
A	EUF07933	e3d1bA1	A: alpha arrays	X: RuvA-C	H: Tas3 C-terminal helical domains (From Topology)	T: Tas3 C-terminal helical domains	F: EUF07933	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
C	1.20.920.40	Mainly Alpha	Up-down Bundle	Histone Acetyltransferase	Chain A	CATH (4.3.0)
B	1.20.920.40	Mainly Alpha	Up-down Bundle	Histone Acetyltransferase	Chain A	CATH (4.3.0)
A	1.20.920.40	Mainly Alpha	Up-down Bundle	Histone Acetyltransferase	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C	PF21487	Tas3, C-terminal helical domains (Tas3_C-hel)	Tas3, C-terminal helical domains	RNA-induced transcriptional silencing complex protein tas3 (Tas3) plays a role in the RNA interference (RNAi) pathway which is important for heterochromatin formation and accurate chromosome segregation. It is part of the RNA-induced transcriptional ...	RNA-induced transcriptional silencing complex protein tas3 (Tas3) plays a role in the RNA interference (RNAi) pathway which is important for heterochromatin formation and accurate chromosome segregation. It is part of the RNA-induced transcriptional silencing (RITS) complex which provides a physical tether between the RNAi and heterochromatin assembly pathways [1]. This entry represents the C-terminal alpha-helical domain which self-associates into a helical polymer and is required for cis spreading of RITS in centromeric DNA regions [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	RNA-induced transcriptional silencing complex protein tas3	regulatory RNA binding RNA binding siRNA binding binding nucleic acid binding molecular adaptor activity	regulation of cellular process negative regulation of biological process cellular component organization cellular component biogenesis siRNA-mediated heterochromatin formation cellular component assembly chromatin organization negative regulation of cellular process chromatin remodeling cellular component organization or biogenesis negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process heterochromatin formation regulation of cellular process negative regulation of biological process cellular component organization cellular component biogenesis siRNA-mediated heterochromatin formation cellular component assembly chromatin organization negative regulation of cellular process chromatin remodeling cellular component organization or biogenesis negative regulation of macromolecule metabolic process regulation of biosynthetic process regulation of biological process heterochromatin formation epigenetic regulation of gene expression negative regulation of metabolic process biological regulation siRNA-mediated pericentric heterochromatin formation heterochromatin organization regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulatory ncRNA-mediated gene silencing regulation of gene expression pericentric heterochromatin formation negative regulation of gene expression constitutive heterochromatin formation regulatory ncRNA-mediated heterochromatin formation biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process cellular process negative regulation of gene expression, epigenetic regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process cell cycle chromosome segregation cell cycle process silent mating-type cassette heterochromatin formation	intracellular anatomical structure chromosome, subtelomeric region intracellular membraneless organelle chromatin chromosome heterochromatin chromosomal region intracellular organelle cellular anatomical structure organelle membraneless organelle chromosome, telomeric region subtelomeric heterochromatin microtubule organizing center intracellular anatomical structure chromosome, subtelomeric region intracellular membraneless organelle chromatin chromosome heterochromatin chromosomal region intracellular organelle cellular anatomical structure organelle membraneless organelle chromosome, telomeric region subtelomeric heterochromatin microtubule organizing center cytoskeleton spindle pole body microtubule cytoskeleton membrane-bounded organelle RITS complex protein-containing complex nucleus membrane-enclosed lumen nuclear protein-containing complex nuclear chromosome intracellular membrane-bounded organelle RNAi effector complex intracellular organelle lumen organelle lumen ribonucleoprotein complex nuclear lumen mating-type region heterochromatin cytoplasm pericentric heterochromatin chromosome, centromeric region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C	IPR049112	Tas3, C-terminal helical domain	Domain

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.