Intermediate cleaving peptidase 55 (EC 3.4.11.26, Icp55, mitochondrial intermediate cleaving peptidase 55 kDa) is an enzyme.[1][2] This enzyme catalyses the following chemical reaction
The enzyme cleaves the Pro36-Pro37 bond of cysteine desulfurase (EC 2.8.1.7) removing three amino acid residues (Tyr-Ser-Pro) from the N-terminus after cleavage by mitochondrial processing peptidase.
Icp55 removes the destabilizing N-terminal amino acid residues.
^Naamati A, Regev-Rudzki N, Galperin S, Lill R, Pines O (October 2009). "Dual targeting of Nfs1 and discovery of its novel processing enzyme, Icp55". The Journal of Biological Chemistry. 284 (44): 30200–8. doi:10.1074/jbc.M109.034694. PMC 2781575. PMID 19720832.
^Vögtle FN, Wortelkamp S, Zahedi RP, Becker D, Leidhold C, Gevaert K, Kellermann J, Voos W, Sickmann A, Pfanner N, Meisinger C (October 2009). "Global analysis of the mitochondrial N-proteome identifies a processing peptidase critical for protein stability". Cell. 139 (2): 428–39. doi:10.1016/j.cell.2009.07.045. PMID 19837041. S2CID 12789215.
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