Annotations: 9J9B

Substrate-engaged TIM23 complex from yeast

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	NTF2-like	8034007	3000472	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)
C	FGE-sulfatase	e9j9bC1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: FGE-sulfatase	ECOD (v295.2)
A	ADH_zinc_N	e9j9bA1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F: ADH_zinc_N	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
F [auth L]	Light Chain	IGKV3	Kappa	mitochondrial import inner membrane translocase subunittim44,l-lactate dehydrogenase (cytochrome),sfgfp	SAbDab (2026-09-11)
E [auth H]	Heavy Chain	IGHV2	-	mitochondrial import inner membrane translocase subunittim44,l-lactate dehydrogenase (cytochrome),sfgfp	SAbDab (2026-09-11)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
D	PF10247	Reactive mitochondrial oxygen species modulator 1 (Romo1)	Reactive mitochondrial oxygen species modulator 1	-	Family
C	PF04280	Tim44-like domain (Tim44)	Tim44-like domain	Tim44 is an essential component of the machinery that mediates the translocation of nuclear-encoded proteins across the mitochondrial inner membrane [1]. Tim44 is thought to bind phospholipids of the mitochondrial inner membrane both by electrostati ...	Tim44 is an essential component of the machinery that mediates the translocation of nuclear-encoded proteins across the mitochondrial inner membrane [1]. Tim44 is thought to bind phospholipids of the mitochondrial inner membrane both by electrostatic interactions and by penetrating the polar head group region [1]. This family includes the C-terminal region of Tim44 that has been shown to form a stable proteolytic fragment in yeast. This region is also found in a set of smaller bacterial proteins. The molecular function of the bacterial members of this family is unknown but transport seems likely. The crystal structure of the C terminal of Tim44 has revealed a large hydrophobic pocket which might play an important role in interacting with the acyl chains of lipid molecules in the mitochondrial membrane [3].	Domain
B	PF02466	Tim17/Tim22/Tim23/Pmp24 family (Tim17)	Tim17/Tim22/Tim23/Pmp24 family	-	Family
A	PF02466	Tim17/Tim22/Tim23/Pmp24 family (Tim17)	Tim17/Tim22/Tim23/Pmp24 family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
G [auth E]	Substrate	-	-	-
F [auth L]	anti-Tim44-Fab L chain	-	-	-
E [auth H]	anti-Tim44-Fab H chain	-	-	-
D	Protein MGR2	-	membrane organization cellular localization transport inner mitochondrial membrane organization intracellular transport establishment of localization mitochondrial membrane organization cellular component organization localization organelle organization establishment of localization in cell cellular process cellular component organization or biogenesis protein insertion into mitochondrial inner membrane membrane organization cellular localization transport inner mitochondrial membrane organization intracellular transport establishment of localization mitochondrial membrane organization cellular component organization localization organelle organization establishment of localization in cell cellular process cellular component organization or biogenesis protein insertion into mitochondrial inner membrane mitochondrial protein import pathway mitochondrial transport mitochondrion organization establishment of protein localization protein transmembrane import into intracellular organelle protein import into mitochondrial matrix protein transmembrane transport intracellular protein localization intracellular protein transmembrane transport mitochondrial transmembrane transport transmembrane transport import into the mitochondrion establishment of protein localization to organelle protein transport protein localization to organelle macromolecule localization protein localization to mitochondrion intracellular protein transport	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane mitochondrial protein-containing complex protein-containing complex TIM23 mitochondrial import inner membrane translocase complex membrane protein complex inner mitochondrial membrane protein complex
C	Mitochondrial import inner membrane translocase subunit TIM44,L-lactate dehydrogenase (cytochrome),sfGFP	oxidoreductase activity, acting on the CH-OH group of donors, cytochrome as acceptor oxidoreductase activity L-lactate dehydrogenase activity oxidoreductase activity, acting on CH-OH group of donors L-lactate dehydrogenase (cytochrome) activity lactate dehydrogenase activity catalytic activity binding tetrapyrrole binding heme binding protein complex scaffold activity structural molecule activity protein binding protein-folding chaperone binding oxidoreductase activity, acting on the CH-OH group of donors, cytochrome as acceptor oxidoreductase activity L-lactate dehydrogenase activity oxidoreductase activity, acting on CH-OH group of donors L-lactate dehydrogenase (cytochrome) activity lactate dehydrogenase activity catalytic activity binding tetrapyrrole binding heme binding protein complex scaffold activity structural molecule activity protein binding protein-folding chaperone binding protein-macromolecule adaptor activity molecular adaptor activity	oxoacid metabolic process carboxylic acid metabolic process small molecule metabolic process metabolic process cellular process monocarboxylic acid metabolic process lactate metabolic process cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport oxoacid metabolic process carboxylic acid metabolic process small molecule metabolic process metabolic process cellular process monocarboxylic acid metabolic process lactate metabolic process cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization intracellular protein localization intracellular protein transport protein transmembrane import into intracellular organelle protein import into mitochondrial matrix protein transmembrane transport mitochondrial transport mitochondrial protein import pathway intracellular protein transmembrane transport mitochondrial transmembrane transport transmembrane transport import into the mitochondrion establishment of protein localization to organelle protein localization to organelle protein localization to mitochondrion	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane cytosol mitochondrial intermembrane space membrane-enclosed lumen intracellular organelle lumen organelle envelope lumen organelle lumen nucleus protein-containing complex TIM23 mitochondrial import inner membrane translocase complex membrane protein complex PAM complex, Tim23 associated import motor mitochondrial matrix mitochondrial protein-containing complex inner mitochondrial membrane protein complex extrinsic component of organelle membrane extrinsic component of membrane extrinsic component of mitochondrial inner membrane
B	Mitochondrial import inner membrane translocase subunit TIM23	macromolecule transmembrane transporter activity protein transporter activity transmembrane protein transporter activity transporter activity transmembrane transporter activity	cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport membrane organization inner mitochondrial membrane organization cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport membrane organization inner mitochondrial membrane organization mitochondrial membrane organization cellular component organization organelle organization cellular component organization or biogenesis protein insertion into mitochondrial inner membrane mitochondrial protein import pathway mitochondrial transport mitochondrion organization protein transmembrane import into intracellular organelle protein import into mitochondrial matrix protein transmembrane transport intracellular protein transmembrane transport mitochondrial transmembrane transport transmembrane transport import into the mitochondrion establishment of protein localization to organelle protein localization to organelle protein localization to mitochondrion	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane mitochondrial protein-containing complex protein-containing complex TIM23 mitochondrial import inner membrane translocase complex membrane protein complex inner mitochondrial membrane protein complex mitochondrial intermembrane space membrane-enclosed lumen intracellular organelle lumen organelle envelope lumen organelle lumen
A	Mitochondrial import inner membrane translocase subunit TIM17	macromolecule transmembrane transporter activity protein transporter activity transmembrane protein transporter activity transporter activity transmembrane transporter activity	cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport membrane organization inner mitochondrial membrane organization cellular localization establishment of protein localization transport intracellular transport establishment of localization localization protein transport establishment of localization in cell macromolecule localization cellular process intracellular protein localization intracellular protein transport membrane organization inner mitochondrial membrane organization mitochondrial membrane organization cellular component organization organelle organization cellular component organization or biogenesis protein insertion into mitochondrial inner membrane mitochondrial protein import pathway mitochondrial transport mitochondrion organization regulation of cellular process negative regulation of biological process mitochondrial DNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process negative regulation of cellular process negative regulation of nucleobase-containing compound metabolic process regulation of nucleobase-containing compound metabolic process negative regulation of macromolecule metabolic process regulation of biological process negative regulation of metabolic process biological regulation primary metabolic process DNA metabolic process regulation of macromolecule metabolic process nucleic acid metabolic process metabolic process negative regulation of DNA metabolic process negative regulation of mitochondrial DNA metabolic process macromolecule metabolic process regulation of metabolic process regulation of mitochondrial DNA metabolic process regulation of DNA metabolic process protein transmembrane import into intracellular organelle protein import into mitochondrial matrix protein transmembrane transport intracellular protein transmembrane transport mitochondrial transmembrane transport transmembrane transport import into the mitochondrion establishment of protein localization to organelle protein localization to organelle protein localization to mitochondrion	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure mitochondrion organelle cytoplasm intracellular membrane-bounded organelle mitochondrial membrane organelle inner membrane membrane mitochondrial inner membrane organelle envelope mitochondrial envelope organelle membrane mitochondrial protein-containing complex protein-containing complex TIM23 mitochondrial import inner membrane translocase complex membrane protein complex inner mitochondrial membrane protein complex mitochondrial intermembrane space membrane-enclosed lumen intracellular organelle lumen organelle envelope lumen organelle lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D	IPR018450	Romo1/Mgr2	Family
C	IPR036400	Cytochrome b5-like heme/steroid binding domain superfamily	Homologous Superfamily
C	IPR018506	Cytochrome b5, heme-binding site	Binding Site
C	IPR037458	L-mandelate/L-lactate dehydrogenase, FMN-binding domain	Domain
C	IPR013785	Aldolase-type TIM barrel	Homologous Superfamily
C	IPR000262	FMN-dependent dehydrogenase	Domain
C	IPR008259	FMN-dependent alpha-hydroxy acid dehydrogenase, active site	Active Site
C	IPR001199	Cytochrome b5-like heme/steroid binding domain	Domain
C	IPR037396	FMN hydroxy acid dehydrogenase domain	Domain
C	IPR032710	NTF2-like domain superfamily	Homologous Superfamily
C	IPR007379	Tim44-like domain	Domain
C	IPR039544	Tim44-like	Family
C	IPR017303	Mitochondrial import inner membrane translocase subunit Tim44	Family
B	IPR045238	Tim23-like	Family
B	IPR005681	Mitochondrial inner membrane translocase complex, subunit Tim23	Family
A	IPR005678	Mitochondrial inner membrane translocase complex, subunit Tim17	Family

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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. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.