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CHCH-CHCH-like Cx9C, IMS import disulfide relay-system, CX9C is the first half of a twin Cx9C motif in eukaryotic proteins. The function of this motif is to import nuclear-encoded mitochondrial intermembrane-space-proteins into the IMS (intermembrane space), as these latter lack a mitochondrial targeting sequence. The Cx9C proteins have a disulfide-bonded alpha-hairpin conformation. Cx9C-containing proteins are thus putative substrates for the Mia40-dependent thiol-disulfide exchange mechanism that carries out an oxidative folding process resulting in the proteins being trapped in the IMS. |
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PubMed References
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Jiyao W et al.(2023). "The conserved domain database in 2023.",