Annotations: 2CIU

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	TIM21	e2ciuA1	A: a+b two layers	X: Cystatin-like	H: NTF2-like (From Topology)	T: NTF2-like	F: TIM21	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.10.450.320	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF08294	TIM21 (TIM21)	TIM21	TIM21 interacts with the outer mitochondrial TOM complex and promotes the insertion of proteins into the inner mitochondrial membrane [1].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	IMPORT INNER MEMBRANE TRANSLOCASE SUBUNIT TIM21 MITOCHONDRIAL	-	protein localization establishment of protein localization cellular localization nitrogen compound transport transport establishment of protein localization to mitochondrial membrane protein targeting mitochondrial membrane organization cellular component organization localization cellular macromolecule localization establishment of localization in cell cellular component organization or biogenesis protein insertion into mitochondrial inner membrane protein localization establishment of protein localization cellular localization nitrogen compound transport transport establishment of protein localization to mitochondrial membrane protein targeting mitochondrial membrane organization cellular component organization localization cellular macromolecule localization establishment of localization in cell cellular component organization or biogenesis protein insertion into mitochondrial inner membrane mitochondrial transport mitochondrion organization membrane organization establishment of protein localization to membrane inner mitochondrial membrane organization intracellular transport localization within membrane protein localization to membrane establishment of localization organelle organization establishment of protein localization to organelle protein transport macromolecule localization protein localization to organelle protein localization to mitochondrion protein targeting to mitochondrion cellular process establishment of protein localization to mitochondrion intracellular protein transport protein transmembrane import into intracellular organelle protein import into mitochondrial matrix protein transmembrane transport mitochondrial transmembrane transport transmembrane transport import into the 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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR013261	Mitochondrial import inner membrane translocase subunit Tim21	Family
A	IPR038552	Tim21 IMS 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.