Annotations: 2K3K

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d2k3ka1	Alpha and beta proteins (a+b)	Ferredoxin-like	RNA-binding domain, RBD, aka RNA recognition motif (RRM)	Canonical RBD	Splicesomal U1A protein	(Drosophila melanogaster ) [TaxId: 7227 ],	SCOPe (2.08)
A	d2k3ka2	Artifacts	Tags	Tags	Tags	C-terminal Tags	(Drosophila melanogaster ) [TaxId: 7227 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	RRM_1_2	e2k3kA1	A: a+b two layers	X: Alpha-beta plaits	H: RNA-binding domain, RBD (From Topology)	T: RNA-binding domain, RBD	F: RRM_1_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.70.330	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	RRM (RNA recognition motif) domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00076	RNA recognition motif (RRM_1)	RNA recognition motif	The RRM motif (a.k.a. RRM, RBD, or RNP domain) is probably diagnostic of an RNA binding protein. RRMs are found in a variety of RNA binding proteins, including various hnRNP proteins, proteins implicated in regulation of alternative splicing, and pro ...	The RRM motif (a.k.a. RRM, RBD, or RNP domain) is probably diagnostic of an RNA binding protein. RRMs are found in a variety of RNA binding proteins, including various hnRNP proteins, proteins implicated in regulation of alternative splicing, and protein components of snRNPs. The motif also appears in a few single stranded DNA binding proteins. The RRM structure consists of four strands and two helices arranged in an alpha/beta sandwich, with a third helix present during RNA binding in some cases The C-terminal beta strand (4th strand) and final helix are hard to align and have been omitted in the SEED alignment The LA proteins (Swiss:P05455) have an N terminal rrm which is included in the seed. There is a second region towards the C terminus that has some features characteristic of a rrm but does not appear to have the important structural core of a rrm. The LA proteins (Swiss:P05455) are one of the main autoantigens in Systemic lupus erythematosus (SLE), an autoimmune disease.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	U1 small nuclear ribonucleoprotein A	RNA binding snRNA binding binding nucleic acid binding U1 snRNA binding pre-mRNA binding pre-mRNA intronic binding pre-mRNA intronic pyrimidine-rich binding mRNA binding U2 snRNA binding poly-pyrimidine tract binding poly(U) RNA binding single-stranded RNA binding identical protein binding RNA binding snRNA binding binding nucleic acid binding U1 snRNA binding pre-mRNA binding pre-mRNA intronic binding pre-mRNA intronic pyrimidine-rich binding mRNA binding U2 snRNA binding poly-pyrimidine tract binding poly(U) RNA binding single-stranded RNA binding identical protein binding protein binding snRNA stem-loop binding RNA stem-loop binding	developmental process sexual reproduction cellular developmental process reproductive process oogenesis multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction female gamete generation gamete generation cell differentiation anatomical structure development germ cell development developmental process sexual reproduction cellular developmental process reproductive process oogenesis multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism developmental process involved in reproduction female gamete generation gamete generation cell differentiation anatomical structure development germ cell development cellular process regulation of cellular process alternative mRNA splicing, via spliceosome RNA metabolic process regulation of mRNA splicing, via spliceosome mRNA processing regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process regulation of RNA metabolic process RNA processing regulation of nucleobase-containing compound metabolic process regulation of biosynthetic process regulation of mRNA processing RNA splicing regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process gene expression nucleobase-containing compound biosynthetic process regulation of RNA splicing mRNA metabolic process macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process RNA splicing, via transesterification reactions regulation of alternative mRNA splicing, via spliceosome mRNA splicing, via spliceosome metabolic process RNA splicing, via transesterification reactions with bulged adenosine as nucleophile regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of mRNA metabolic process regulation of metabolic process multicellular organism development multicellular organismal process sex determination primary sex determination primary sex determination, soma somatic sex determination germ-line sex determination female sex determination primary sex determination, germ-line female germ-line sex determination	membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle intracellular organelle cellular anatomical structure spliceosomal complex organelle ribonucleoprotein complex precatalytic spliceosome Sm-like protein family complex small nuclear ribonucleoprotein complex membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle intracellular organelle cellular anatomical structure spliceosomal complex organelle ribonucleoprotein complex precatalytic spliceosome Sm-like protein family complex small nuclear ribonucleoprotein complex spliceosomal snRNP complex U2 snRNP catalytic step 2 spliceosome catalytic complex U1 snRNP

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000504	RNA recognition motif domain	Domain
A	IPR012677	Nucleotide-binding alpha-beta plait domain superfamily	Homologous Superfamily
A	IPR035979	RNA-binding domain superfamily	Homologous Superfamily

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.