Annotations: 5A4A

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	OSK domain-like	8046584	4005171	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	SGNH hydrolase-like	8102762	3001315	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	UNK_F_TYPE	e5a4aA1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: SGNH hydrolase (From Topology)	T: SGNH hydrolase	F: UNK_F_TYPE	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.40.50.1110	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	SGNH hydrolase	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF17182	OSK domain (OSK)	OSK domain	This entry represents the OSK domain defined by Jeske and colleagues [1]. The domain is related to SGNH hydrolases but lacks the active site residues. The domain binds to RNA [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	MATERNAL EFFECT PROTEIN OSKAR	RNA binding binding organic cyclic compound binding nucleic acid binding mRNA binding	regulation of cellular process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process post-transcriptional regulation of gene expression regulation of RNA metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of biological quality RNA catabolic process mRNA catabolic process regulation of biological process cellular metabolic process regulation of cellular process negative regulation of biological process negative regulation of cellular metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process post-transcriptional regulation of gene expression regulation of RNA metabolic process organic substance biosynthetic process regulation of nucleobase-containing compound metabolic process regulation of biological quality RNA catabolic process mRNA catabolic process regulation of biological process cellular metabolic process negative regulation of metabolic process primary metabolic process regulation of cellular metabolic process negative regulation of cellular biosynthetic process nucleobase-containing compound catabolic process organic cyclic compound metabolic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of macromolecule biosynthetic process nucleic acid catabolic process metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of metabolic process catabolic process cellular biosynthetic process RNA metabolic process macromolecule catabolic process regulation of mRNA catabolic process organic substance metabolic process negative regulation of cellular process negative regulation of macromolecule metabolic process regulation of biosynthetic process biological regulation regulation of macromolecule metabolic process regulation of catabolic process gene expression mRNA metabolic process macromolecule biosynthetic process nucleic acid metabolic process organic cyclic compound catabolic process regulation of mRNA stability regulation of cellular biosynthetic process negative regulation of biosynthetic process regulation of RNA stability cellular process regulation of mRNA metabolic process organic substance catabolic process developmental process sexual reproduction cellular developmental process reproductive process oogenesis multicellular organismal reproductive process cell development cellular process involved in reproduction in multicellular organism female gamete generation developmental process involved in reproduction gamete generation cell differentiation anatomical structure development germ cell development multicellular organism development multicellular organismal process segmentation pattern specification process regionalization blastoderm segmentation anterior/posterior pattern specification anterior/posterior axis specification, embryo embryo development oocyte development tripartite regional subdivision cellular component biogenesis cellular component organization embryonic axis specification cellular component assembly anterior/posterior axis specification cellular component organization or biogenesis cell maturation embryonic pattern specification oocyte axis specification oocyte construction oocyte anterior/posterior axis specification developmental maturation cytoplasm organization pole plasm assembly anatomical structure maturation maternal determination of anterior/posterior axis, embryo oocyte differentiation axis specification protein localization localization cellular macromolecule localization cellular localization pole plasm protein localization macromolecule localization zygotic determination of anterior/posterior axis, embryo posterior abdomen determination response to light stimulus behavior response to stimulus visual behavior response to radiation response to abiotic stimulus system process learning learning or memory nervous system process visual learning cognition associative learning RNA localization pole plasm mRNA localization pole plasm RNA localization intracellular mRNA localization involved in anterior/posterior axis specification intracellular mRNA localization intracellular mRNA localization involved in pattern specification process long-term memory memory organelle organization actin cytoskeleton organization cortical actin cytoskeleton organization cortical cytoskeleton organization actin filament-based process cytoskeleton organization P granule organization non-membrane-bounded organelle assembly P granule assembly organelle assembly cellularization pole cell formation anatomical structure morphogenesis pole cell development anatomical structure formation involved in morphogenesis microtubule cytoskeleton organization establishment or maintenance of cell polarity establishment or maintenance of microtubule cytoskeleton polarity establishment or maintenance of cytoskeleton polarity oocyte microtubule cytoskeleton polarization microtubule-based process oocyte microtubule cytoskeleton organization organonitrogen compound biosynthetic process protein metabolic process organonitrogen compound metabolic process regulation of oskar mRNA translation regulation of protein metabolic process translation regulation of translation protein localization to organelle protein localization to nucleus thermosensory behavior response to temperature stimulus	intracellular anatomical structure P granule cytoplasmic ribonucleoprotein granule germ plasm cellular anatomical entity ribonucleoprotein granule intracellular organelle organelle pole plasm intracellular non-membrane-bounded organelle cytoplasm supramolecular complex non-membrane-bounded organelle cell periphery intracellular anatomical structure P granule cytoplasmic ribonucleoprotein granule germ plasm cellular anatomical entity ribonucleoprotein granule intracellular organelle organelle pole plasm intracellular non-membrane-bounded organelle cytoplasm supramolecular complex non-membrane-bounded organelle cell periphery cell cortex membrane-bounded organelle nucleus germ cell nucleus intracellular membrane-bounded organelle posterior cell cortex cell cortex region cytoplasmic region endosome intracellular vesicle endomembrane system cytoplasmic vesicle vesicle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR033447	OSK domain	Domain
A	IPR036514	SGNH hydrolase superfamily	Homologous Superfamily
A	IPR025605	OST-HTH/LOTUS domain	Domain
A	IPR041966	LOTUS-like domain	Homologous Superfamily

RCSB PDB Core Operations are 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.