Q9Y5J9 · TIM8B_HUMAN
- ProteinMitochondrial import inner membrane translocase subunit Tim8 B
- GeneTIMM8B
- StatusUniProtKB reviewed (Swiss-Prot)
- Organism
- Amino acids
- Protein existenceEvidence at protein level
- Annotation score4/5
Function
function
Probable mitochondrial intermembrane chaperone that participates in the import and insertion of some multi-pass transmembrane proteins into the mitochondrial inner membrane. Also required for the transfer of beta-barrel precursors from the TOM complex to the sorting and assembly machinery (SAM complex) of the outer membrane. Acts as a chaperone-like protein that protects the hydrophobic precursors from aggregation and guide them through the mitochondrial intermembrane space (By similarity).
GO annotations
all annotations | all molecular function | virus receptor activity | dna binding | rna binding | cytoskeletal motor activity | catalytic activity | gtpase activity | structural molecule activity | transporter activity | cytoskeletal protein binding | lipid binding | cyclase activity | antioxidant activity | oxidoreductase activity | transferase activity | hydrolase activity | lyase activity | isomerase activity | ligase activity | protein tag activity | cargo receptor activity | histone binding | protein folding chaperone | translation regulator activity | nutrient reservoir activity | receptor ligand activity | molecular transducer activity | molecular adaptor activity | toxin activity | cell adhesion mediator activity | molecular function regulator activity | virus coreceptor activity | catalytic activity, acting on a protein | catalytic activity, acting on dna | catalytic activity, acting on rna | molecular carrier activity | transcription regulator activity | general transcription initiation factor activity | molecular sensor activity | molecular sequestering activity | atp-dependent activity | other molecular function | all biological process | mitotic cell cycle | cytokinesis | cytoplasmic translation | immune system process | muscle system process | circulatory system process | renal system process | respiratory system process | carbohydrate metabolic process | generation of precursor metabolites and energy | dna replication | dna repair | dna recombination | chromatin organization | dna-templated transcription | regulation of dna-templated transcription | trna metabolic process | protein folding | protein glycosylation | amino acid metabolic process | modified amino acid metabolic process | lipid metabolic process | vitamin metabolic process | sulfur compound metabolic process | intracellular protein transport | nucleocytoplasmic transport | autophagy | inflammatory response | mitochondrion organization | cytoskeleton organization | microtubule-based movement | peroxisome organization | lysosome organization | chromosome segregation | cell adhesion | establishment or maintenance of cell polarity | programmed cell death | photosynthesis | mrna metabolic process | snrna metabolic process | vesicle-mediated transport | reproductive process | digestive system process | signaling | cell differentiation | protein catabolic process | extracellular matrix organization | regulatory ncrna-mediated gene silencing | telomere organization | cell junction organization | wound healing | ribosome biogenesis | cilium organization | anatomical structure development | cell motility | nervous system process | endocrine process | protein maturation | transmembrane transport | nucleobase-containing small molecule metabolic process | hepaticobiliary system process | membrane organization | protein-containing complex assembly | cell wall organization or biogenesis | nitrogen cycle metabolic process | protein localization to plasma membrane | defense response to other organism | detoxification | meiotic nuclear division | mitotic nuclear division | mitochondrial gene expression | carbohydrate derivative metabolic process | other biological process | all cellular component | nuclear chromosome | extracellular region | extracellular space | cell wall | nucleus | nuclear envelope | nucleoplasm | chromosome | nucleolus | mitochondrion | lysosome | endosome | vacuole | peroxisome | endoplasmic reticulum | golgi apparatus | lipid droplet | microtubule organizing center | cytosol | ribosome | cytoskeleton | plasma membrane | cilium | plastid | thylakoid | external encapsulating structure | extracellular matrix | cytoplasmic vesicle | organelle | other cellular component | |||
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Aspect | Term | |
---|---|---|
Cellular Component | extracellular space | |
Cellular Component | mitochondrial inner membrane | |
Cellular Component | mitochondrial intermembrane space | |
Cellular Component | mitochondrial intermembrane space protein transporter complex | |
Molecular Function | protein transporter activity | |
Molecular Function | zinc ion binding | |
Biological Process | protein insertion into mitochondrial inner membrane | |
Biological Process | protein targeting to mitochondrion | |
Biological Process | sensory perception of sound |
Keywords
- Molecular function
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameMitochondrial import inner membrane translocase subunit Tim8 B
- Alternative names
Gene names
Organism names
- Organism
- Taxonomic lineageEukaryota > Metazoa > Chordata > Craniata > Vertebrata > Euteleostomi > Mammalia > Eutheria > Euarchontoglires > Primates > Haplorrhini > Catarrhini > Hominidae > Homo
Accessions
- Primary accessionQ9Y5J9
- Secondary accessions
Proteomes
Organism-specific databases
Subcellular Location
UniProt Annotation
GO Annotation
Mitochondrion inner membrane ; Peripheral membrane protein
Keywords
- Cellular component
Disease & Variants
Variants
We now provide the "Disease & Variants" viewer in its own tab.
The viewer provides 116 variants from UniProt as well as other sources including ClinVar and dbSNP.
Organism-specific databases
Miscellaneous
Genetic variation databases
PTM/Processing
Features
Showing features for initiator methionine, modified residue, chain, disulfide bond.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Initiator methionine | 1 | Removed | ||||
Sequence: M | ||||||
Modified residue | 2 | N-acetylalanine | ||||
Sequence: A | ||||||
Chain | PRO_0000193587 | 2-83 | Mitochondrial import inner membrane translocase subunit Tim8 B | |||
Sequence: AELGEADEAELQRLVAAEQQKAQFTAQVHHFMELCWDKCVEKPGNRLDSRTENCLSSCVDRFIDTTLAITSRFAQIVQKGGQ | ||||||
Disulfide bond | 36↔59 | |||||
Sequence: CWDKCVEKPGNRLDSRTENCLSSC | ||||||
Disulfide bond | 40↔55 | |||||
Sequence: CVEKPGNRLDSRTENC |
Keywords
- PTM
Proteomic databases
PTM databases
Expression
Tissue specificity
Ubiquitous, with highest expression in heart, kidney, liver and skeletal muscle.
Gene expression databases
Organism-specific databases
Interaction
Subunit
Heterohexamer; possibly composed of 3 copies of TIMM8B and 3 copies of TIMM13, named soluble 70 kDa complex. Associates with the TIM22 complex, whose core is composed of TIMM22 (By similarity).
Protein-protein interaction databases
Miscellaneous
Structure
Family & Domains
Features
Showing features for motif.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Motif | 36-59 | Twin CX3C motif | ||||
Sequence: CWDKCVEKPGNRLDSRTENCLSSC |
Domain
The twin CX3C motif contains 4 conserved Cys residues that form 2 disulfide bonds in the mitochondrial intermembrane space. However, during the transit of TIMM8B from cytoplasm into mitochondrion, the Cys residues probably coordinate zinc, thereby preventing folding and allowing its transfer across mitochondrial outer membrane (By similarity).
Sequence similarities
Belongs to the small Tim family.
Phylogenomic databases
Family and domain databases
Sequence
- Sequence statusComplete
- Length83
- Mass (Da)9,344
- Last updated1999-11-01 v1
- Checksum9DC47BB475DB8692
Computationally mapped potential isoform sequences
There are 2 potential isoforms mapped to this entry
Keywords
- Technical term
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
AF152350 EMBL· GenBank· DDBJ | AAF15100.1 EMBL· GenBank· DDBJ | mRNA | ||
AF150087 EMBL· GenBank· DDBJ | AAD39994.1 EMBL· GenBank· DDBJ | mRNA | ||
AK312169 EMBL· GenBank· DDBJ | BAG35103.1 EMBL· GenBank· DDBJ | mRNA | ||
EF445036 EMBL· GenBank· DDBJ | ACA06083.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
BC000711 EMBL· GenBank· DDBJ | AAH00711.1 EMBL· GenBank· DDBJ | mRNA | ||
BC105986 EMBL· GenBank· DDBJ | AAI05987.1 EMBL· GenBank· DDBJ | mRNA | ||
BC106067 EMBL· GenBank· DDBJ | AAI06068.1 EMBL· GenBank· DDBJ | mRNA | ||
AF165967 EMBL· GenBank· DDBJ | AAD51801.1 EMBL· GenBank· DDBJ | mRNA |