Annotations: 1UKL

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1uklb_	All alpha proteins	alpha-alpha superhelix	ARM repeat	Armadillo repeat	Importin beta	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
A	d1ukla_	All alpha proteins	alpha-alpha superhelix	ARM repeat	Armadillo repeat	Importin beta	house mouse (Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C	d1uklc_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	SREBP-2	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d1ukld_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	SREBP-2	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E	d1ukle_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	SREBP-2	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F	d1uklf_	All alpha proteins	HLH-like	HLH, helix-loop-helix DNA-binding domain	HLH, helix-loop-helix DNA-binding domain	SREBP-2	human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	ARM repeat-like	8038545	3000116	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	ARM repeat-like	8038545	3000116	SCOP2B (2022-06-29)
C	SCOP2 Family	HLH, helix-loop-helix DNA-binding domain	8029481	4000913	SCOP2 (2022-06-29)
C	SCOP2 Superfamily	HLH, helix-loop-helix DNA-binding domain	8041860	3001962	SCOP2 (2022-06-29)
D	SCOP2B Superfamily	HLH, helix-loop-helix DNA-binding domain	8041860	3001962	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	HLH, helix-loop-helix DNA-binding domain	8041860	3001962	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	HLH, helix-loop-helix DNA-binding domain	8041860	3001962	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	IBN_N	e1uklB1	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: IBN_N	ECOD (1.6)
A	IBN_N	e1uklA1	A: alpha superhelices	X: Repetitive alpha hairpins	H: ARM repeat (From Topology)	T: ARM repeat	F: IBN_N	ECOD (1.6)
C	HLH	e1uklC1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: HLH	ECOD (1.6)
D	HLH	e1uklD1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: HLH	ECOD (1.6)
E	HLH	e1uklE1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: HLH	ECOD (1.6)
F	HLH	e1uklF1	A: alpha duplicates or obligate multimers	X: HLH-like	H: HLH, helix-loop-helix DNA-binding domain (From Topology)	T: HLH, helix-loop-helix DNA-binding domain	F: HLH	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.25.10.10	Mainly Alpha	Alpha Horseshoe	Leucine-rich Repeat Variant	Leucine-rich Repeat Variant	CATH (4.3.0)
A	1.25.10.10	Mainly Alpha	Alpha Horseshoe	Leucine-rich Repeat Variant	Leucine-rich Repeat Variant	CATH (4.3.0)
C	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)
D	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)
E	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)
F	4.10.280.10	Few Secondary Structures	Irregular	MYOD Basic-Helix-Loop-Helix Domain, subunit B	Helix-loop-helix DNA-binding domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF03810	Importin-beta N-terminal domain (IBN_N)	Importin-beta N-terminal domain	-	Repeat
A, B	PF13513	HEAT-like repeat (HEAT_EZ)	HEAT-like repeat	-	Repeat
C, D, E, F	PF00010	Helix-loop-helix DNA-binding domain (HLH)	Helix-loop-helix DNA-binding domain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Importin beta-1 subunit	small GTPase binding protein binding binding enzyme binding GTPase binding protein domain specific binding Hsp90 protein binding heat shock protein binding cytoskeletal protein binding kinesin binding nuclear localization sequence binding signal sequence binding peptide binding protein-containing complex binding small GTPase binding protein binding binding enzyme binding GTPase binding protein domain specific binding Hsp90 protein binding heat shock protein binding cytoskeletal protein binding kinesin binding nuclear localization sequence binding signal sequence binding peptide binding protein-containing complex binding nuclear import signal receptor activity nucleocytoplasmic carrier activity molecular carrier activity importin-alpha family protein binding	cellular localization RNA import into nucleus RNA transport nitrogen compound transport nucleocytoplasmic transport transport nuclear transport nucleic acid transport intracellular transport establishment of localization localization import into nucleus establishment of RNA localization establishment of localization in cell macromolecule localization cellular localization RNA import into nucleus RNA transport nitrogen compound transport nucleocytoplasmic transport transport nuclear transport nucleic acid transport intracellular transport establishment of localization localization import into nucleus establishment of RNA localization establishment of localization in cell macromolecule localization cellular process RNA localization nucleobase-containing compound transport mitotic cell cycle cellular component organization mitotic chromosome movement towards spindle pole chromosome localization organelle localization mitotic sister chromatid segregation cell cycle cellular component organization or biogenesis chromosome segregation chromosome movement towards spindle pole cell cycle process mitotic nuclear division organelle fission chromosome organization sister chromatid segregation organelle organization nuclear division mitotic cell cycle process nuclear chromosome segregation microtubule-based movement microtubule-based process establishment of organelle localization mitotic metaphase chromosome alignment metaphase chromosome alignment establishment of chromosome localization microtubule cytoskeleton organization spindle localization establishment of mitotic spindle localization establishment of spindle localization microtubule cytoskeleton organization involved in mitosis cytoskeleton organization protein localization establishment of protein localization protein localization to nucleus establishment of protein localization to organelle protein transport cellular macromolecule localization protein localization to organelle protein import into nucleus intracellular protein transport astral microtubule organization cytoplasmic microtubule organization supramolecular fiber organization spindle organization NLS-bearing protein import into nucleus non-membrane-bounded organelle assembly cellular component biogenesis cellular component assembly organelle assembly spindle assembly mitotic spindle organization mitotic spindle assembly ribosomal protein import into nucleus	intracellular anatomical structure cytoplasmic ribonucleoprotein granule cellular anatomical entity ribonucleoprotein granule intracellular organelle organelle intracellular non-membrane-bounded organelle cytoplasm supramolecular complex non-membrane-bounded organelle cytoplasmic stress granule protein-containing complex nucleocytoplasmic transport complex NLS-dependent protein nuclear import complex intracellular anatomical structure cytoplasmic ribonucleoprotein granule cellular anatomical entity ribonucleoprotein granule intracellular organelle organelle intracellular non-membrane-bounded organelle cytoplasm supramolecular complex non-membrane-bounded organelle cytoplasmic stress granule protein-containing complex nucleocytoplasmic transport complex NLS-dependent protein nuclear import complex membrane-bounded organelle nuclear membrane membrane nucleus intracellular membrane-bounded organelle endomembrane system organelle envelope nuclear envelope organelle membrane cytosol nuclear protein-containing complex nuclear pore membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen organelle subcompartment endoplasmic reticulum subcompartment endoplasmic reticulum endoplasmic reticulum tubular network
C, D, E, F	Sterol regulatory element binding protein-2	DNA-binding transcription factor activity, RNA polymerase II-specific DNA-binding transcription repressor activity, RNA polymerase II-specific transcription regulator activity DNA-binding transcription repressor activity DNA-binding transcription factor activity DNA binding sequence-specific DNA binding binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding DNA-binding transcription factor activity, RNA polymerase II-specific DNA-binding transcription repressor activity, RNA polymerase II-specific transcription regulator activity DNA-binding transcription repressor activity DNA-binding transcription factor activity DNA binding sequence-specific DNA binding binding double-stranded DNA binding nucleic acid binding RNA polymerase II transcription regulatory region sequence-specific DNA binding cis-regulatory region sequence-specific DNA binding sequence-specific double-stranded DNA binding transcription cis-regulatory region binding organic cyclic compound binding transcription regulatory region nucleic acid binding RNA polymerase II cis-regulatory region sequence-specific DNA binding E-box binding protein binding protein dimerization activity	cellular response to stimulus regulation of biological process regulation of signaling regulation of cellular process cell surface receptor signaling pathway response to stimulus signaling biological regulation regulation of signal transduction cell communication Notch signaling pathway regulation of response to stimulus regulation of Notch signaling pathway regulation of cell communication cellular response to stimulus regulation of biological process regulation of signaling regulation of cellular process cell surface receptor signaling pathway response to stimulus signaling biological regulation regulation of signal transduction cell communication Notch signaling pathway regulation of response to stimulus regulation of Notch signaling pathway regulation of cell communication cellular process signal transduction cellular response to sterol depletion response to sterol depletion intracellular signal transduction SREBP signaling pathway cellular response to stress response to stress ER-nucleus signaling pathway regulation of steroid biosynthetic process regulation of cholesterol biosynthetic process regulation of cholesterol metabolic process organic hydroxy compound metabolic process sterol metabolic process steroid metabolic process regulation of lipid metabolic process positive regulation of biological process cholesterol metabolic process lipid biosynthetic process alcohol metabolic process regulation of primary metabolic process positive regulation of metabolic process regulation of small molecule metabolic process positive regulation of biosynthetic process positive regulation of lipid metabolic process small molecule metabolic process steroid biosynthetic process regulation of biosynthetic process secondary alcohol biosynthetic process regulation of alcohol biosynthetic process small molecule biosynthetic process regulation of steroid metabolic process cholesterol biosynthetic process positive regulation of cholesterol biosynthetic process primary metabolic process secondary alcohol metabolic process positive regulation of steroid biosynthetic process biosynthetic process sterol biosynthetic process positive regulation of lipid biosynthetic process regulation of sterol biosynthetic process organic hydroxy compound biosynthetic process alcohol biosynthetic process positive regulation of cholesterol metabolic process positive regulation of steroid metabolic process metabolic process regulation of lipid biosynthetic process positive regulation of small molecule metabolic process regulation of metabolic process positive regulation of alcohol biosynthetic process positive regulation of sterol biosynthetic process lipid metabolic process sterol homeostasis chemical homeostasis homeostatic process cholesterol homeostasis lipid homeostasis positive regulation of macromolecule biosynthetic process nucleobase-containing compound metabolic process DNA-templated transcription regulation of RNA metabolic process regulation of miRNA metabolic process positive regulation of macromolecule metabolic process regulation of nucleobase-containing compound metabolic process miRNA metabolic process positive regulation of nucleobase-containing compound metabolic process cellular metabolic process regulation of cellular metabolic process positive regulation of RNA metabolic process regulation of gene expression regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of DNA-templated transcription cellular biosynthetic process positive regulation of DNA-templated transcription RNA metabolic process positive regulation of miRNA transcription positive regulation of cellular metabolic process positive regulation of miRNA metabolic process RNA biosynthetic process nucleic acid biosynthetic process miRNA transcription positive regulation of cellular process regulation of RNA biosynthetic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of cellular biosynthetic process positive regulation of RNA biosynthetic process positive regulation of cellular biosynthetic process regulation of miRNA transcription protein localization regulation of localization establishment of protein localization cellular localization regulation of protein localization protein targeting regulation of protein targeting to mitochondrion positive regulation of establishment of protein localization localization cellular macromolecule localization positive regulation of protein targeting to mitochondrion regulation of establishment of protein localization establishment of localization regulation of establishment of protein localization to mitochondrion establishment of protein localization to organelle regulation of protein targeting regulation of cellular localization macromolecule localization protein localization to organelle protein localization to mitochondrion positive regulation of protein localization protein targeting to mitochondrion establishment of protein localization to mitochondrion positive regulation of establishment of protein localization to mitochondrion cellular response to nutrient levels response to nutrient levels response to starvation cellular response to starvation cholesterol storage lipid storage lipid localization positive regulation of lipid localization maintenance of location regulation of lipid storage regulation of lipid localization positive regulation of cholesterol storage regulation of cholesterol storage positive regulation of lipid storage response to laminar fluid shear stress cellular response to laminar fluid shear stress response to fluid shear stress cellular response to fluid shear stress catabolic process regulation of cellular component organization macroautophagy autophagy regulation of autophagy cellular catabolic process cellular component organization mitophagy organelle disassembly regulation of autophagy of mitochondrion cellular component organization or biogenesis process utilizing autophagic mechanism mitochondrion organization cellular component disassembly regulation of mitophagy regulation of catabolic process regulation of organelle organization organelle organization regulation of macroautophagy regulation of cellular catabolic process regulation of mitochondrion organization autophagy of mitochondrion cellular response to low-density lipoprotein particle stimulus response to endogenous stimulus response to organonitrogen compound response to chemical response to lipoprotein particle response to nitrogen compound cellular response to lipoprotein particle stimulus negative regulation of sterol transport transport negative regulation of biological process regulation of lipid transport negative regulation of transport organic hydroxy compound transport negative regulation of lipid localization regulation of cholesterol efflux sterol transport regulation of cholesterol transport regulation of sterol transport negative regulation of lipid transport regulation of transport lipid transport negative regulation of cholesterol transport negative regulation of cholesterol efflux cholesterol transport cholesterol efflux negative regulation of cellular metabolic process negative regulation of RNA biosynthetic process transcription by RNA polymerase II negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of transcription by RNA polymerase II negative regulation of DNA-templated transcription negative regulation of transcription by RNA polymerase II negative regulation of metabolic process negative regulation of cellular biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process negative regulation of RNA metabolic process positive regulation of transcription by RNA polymerase II	intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle intracellular organelle organelle intracellular membrane-bounded organelle nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen intracellular anatomical structure cytoplasm cellular anatomical entity cytosol membrane-bounded organelle intracellular organelle organelle intracellular membrane-bounded organelle nucleus membrane-enclosed lumen intracellular organelle lumen nucleoplasm organelle lumen nuclear lumen protein-containing complex protein-DNA complex intracellular non-membrane-bounded organelle chromatin chromosome non-membrane-bounded organelle organelle subcompartment membrane endomembrane system endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum organelle membrane endoplasmic reticulum membrane Golgi membrane Golgi apparatus bounding membrane of organelle membrane protein complex SREBP-SCAP-Insig complex endoplasmic reticulum protein-containing complex transport vesicle intracellular vesicle transport vesicle membrane cytoplasmic vesicle membrane coated vesicle membrane COPII-coated ER to Golgi transport vesicle vesicle membrane cytoplasmic vesicle ER to Golgi transport vesicle membrane coated vesicle vesicle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR016024	Armadillo-type fold	Homologous Superfamily
A, B	IPR021133	HEAT, type 2	Repeat
A, B	IPR000225	Armadillo	Repeat
A, B	IPR001494	Importin-beta, N-terminal domain	Domain
A, B	IPR011989	Armadillo-like helical	Homologous Superfamily
A, B	IPR040122	Importin beta family	Family
C, D, E, F	IPR011598	Myc-type, basic helix-loop-helix (bHLH) domain	Domain
C, D, E, F	IPR036638	Helix-loop-helix DNA-binding domain superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C, D, E, F	Pharos: Q12772	chronic kidney disease Insulin Resistance cataract hepatocellular carcinoma inherited lipid metabolism disorder intellectual disability schizophrenia gastric cancer hereditary diffuse gastric adenocarcinoma large cell medulloblastoma gastric neoplasm osteosarcoma

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 R01GM133198.