Intermediate cleaving peptidase 55

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.

References

↑ Naamati, A., Regev-Rudzki, N., Galperin, S., Lill, R. and Pines, O. (2009). "Dual targeting of Nfs1 and discovery of its novel processing enzyme, Icp55". J. Biol. Chem. 284: 30200–30208. doi:10.1074/jbc.M109.034694. PMID 19720832.
↑ Vogtle, F.N., Wortelkamp, S., Zahedi, R.P., Becker, D., Leidhold, C., Gevaert, K., Kellermann, J., Voos, W., Sickmann, A., Pfanner, N. and Meisinger, C. (2009). "Global analysis of the mitochondrial N-proteome identifies a processing peptidase critical for protein stability". Cell 139: 428–439. doi:10.1016/j.cell.2009.07.045. PMID 19837041.

External links

Intermediate cleaving peptidase 55 at the US National Library of Medicine Medical Subject Headings (MeSH)

Hydrolase: proteases (EC 3.4)

3.4.11-19: Exopeptidase

3.4.11	Aminopeptidase Alanine Arginyl Aspartyl Cystinyl Leucyl Glutamyl Methionyl 1 2 O

3.4.13	Dipeptidase 1 2 3

3.4.14	Dipeptidyl peptidase Cathepsin C Dipeptidyl peptidase-4 Tripeptidyl peptidase Tripeptidyl peptidase I Tripeptidyl peptidase II

3.4.15	Angiotensin-converting enzyme

3.4.16	Serine type carboxypeptidases: Cathepsin A DD-transpeptidase

3.4.17	Metalloexopeptidases Carboxypeptidase A A2 B C E Glutamate II

Other/ungrouped	Metalloexopeptidase

3.4.21-25: Endopeptidase

Other/ungrouped: Amyloid precursor protein secretase

3.4.99: Unknown

Staphylokinase

Proteins: enzymes

Activity	Active site Binding site Catalytic triad Oxyanion hole Enzyme promiscuity Catalytically perfect enzyme Coenzyme Cofactor Enzyme catalysis Enzyme kinetics Lineweaver–Burk plot Michaelis–Menten kinetics

Regulation	Allosteric regulation Cooperativity Enzyme inhibitor

Classification	EC number Enzyme superfamily Enzyme family List of enzymes

Types	EC1 Oxidoreductases(list) EC2 Transferases(list) EC3 Hydrolases(list) EC4 Lyases(list) EC5 Isomerases(list) EC6 Ligases(list)

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