Serine protease HTRA2, mitochondrial

Serine protease HTRA2, mitochondrial is an enzyme that in humans is encoded by the HTRA2 gene. This protein is involved in caspase-dependent apoptosis and in Parkinson's disease.

HTRA2
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1LCY, 2PZD
Identifiers
Aliases	HTRA2, Htra2, AI481710, Omi, Prss25, mnd2, PARK13, HtrA serine peptidase 2, MGCA8
External IDs	OMIM: 606441 MGI: 1928676 HomoloGene: 113300 GeneCards: HTRA2
Gene location (Human) Chr. Chromosome 2 (human) Band 2p13.1 Start 74,529,596 bp End 74,533,350 bp
Gene location (Mouse) Chr. Chromosome 6 (mouse) Band 6 C3|6 35.94 cM Start 83,028,247 bp End 83,032,254 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right coronary artery spongy bone ganglionic eminence spleen ascending aorta left coronary artery prefrontal cortex gastric mucosa right adrenal gland lymph node Top expressed in renal corpuscle medullary collecting duct fossa condyle ureter seminal vesicula endocardial cushion sciatic nerve ascending aorta Paneth cell More reference expression data BioGPS More reference expression data
Gene ontology Molecular function unfolded protein binding protein binding serine-type peptidase activity serine-type endopeptidase activity hydrolase activity peptidase activity identical protein binding Cellular component integral component of membrane cytosol endoplasmic reticulum membrane membrane mitochondrial membranes mitochondrial intermembrane space endoplasmic reticulum mitochondrion CD40 receptor complex cytoplasmic side of plasma membrane chromatin cytoskeleton nucleus serine-type endopeptidase complex Biological process cellular response to retinoic acid cellular response to heat positive regulation of cell death ceramide metabolic process cellular response to interferon-beta regulation of multicellular organism growth positive regulation of protein targeting to mitochondrion execution phase of apoptosis adult locomotory behavior cellular response to growth factor stimulus pentacyclic triterpenoid metabolic process mitochondrion organization negative regulation of cell cycle neuron development protein autoprocessing positive regulation of cysteine-type endopeptidase activity involved in apoptotic signaling pathway negative regulation of cell death intrinsic apoptotic signaling pathway positive regulation of extrinsic apoptotic signaling pathway in absence of ligand regulation of autophagy of mitochondrion intrinsic apoptotic signaling pathway in response to DNA damage positive regulation of apoptotic process forebrain development negative regulation of oxidative stress-induced intrinsic apoptotic signaling pathway response to herbicide adult walking behavior negative regulation of neuron death apoptotic process human ageing proteolysis positive regulation of mitochondrion organization cellular response to oxidative stress negative regulation of mitophagy in response to mitochondrial depolarization positive regulation of cysteine-type endopeptidase activity involved in apoptotic process protein homotrimerization Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 27429 64704 Ensembl ENSG00000115317 ENSMUSG00000068329 UniProt O43464 Q9JIY5 RefSeq (mRNA) NM_013247 NM_145074 NM_001321727 NM_001321728 NM_019752 RefSeq (protein) NP_001308656 NP_001308657 NP_037379 NP_659540 NP_062726 Location (UCSC) Chr 2: 74.53 – 74.53 Mb Chr 6: 83.03 – 83.03 Mb PubMed search
Wikidata
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Structure

Gene

The gene HTRA2 encodes a serine protease. The human gene has 8 exons and locates at chromosome band 2p12.

Protein

Protein HtrA2, also known as Omi, is a mitochondrially-located serine protease. The human protein Serine protease HTRA2, mitochondrial is 49kDa in size and composed of 458 amino acids. The peptide fragment of 1-31 amino acid is the mitochondrial transition sequence, fragment 32-133 amino acid is propertied, and 134-458 is the mature protein Serine protease HTRA2, mitochondrial, and its theoretical pI of this protein is 6.12. HtrA2 shows similarities with DegS, a bacterial protease present in the periplasm of gram-negative bacteria. Structurally, HtrA2 is a trimeric molecule with central protease domains and a carboxy-terminal PDZ domain, which is characteristic of the HtrA family. The PDZ domain preferentially binds C-terminus of the protein substrate and modulate the proteolytic activity of the trypsin-like protease domain.

Function

The high-temperature requirement (HtrA) family are conserved evolutionarily and these oligomeric serine proteases has been classified in family S1B of the PA protease clan in the MEROPS protease database. The protease activity of the HtrA member HtrA2/Omi is required for mitochondrial homeostasis in mice and humans and inactivating mutations associated with neurodegenerative disorders such as Parkinson's disease. Moreover, HtrA2/Omi is released in the cytosol from the mitochondria during apoptosis and uses its four most N-terminal amino acids to mimic a caspase and be recruited by inhibitor of apoptosis protein (IAP) caspase inhibitors such as XIAP and CIAP1/2. Once bound, the serine protease cleaves the IAP, reducing the cell's inhibition to caspase activation. In summary, HTRA2/Omi contributes to apoptosis through both caspase-dependent and -independent pathways.

Clinical significance

The members of the HtrA family of proteases have been shown playing critical roles in cell physiology and being involved in several pathological processes including cancer and neurodegenerative disease. Strong evidences supported of HtrA2's involvement in oncogenesis. This protein is widely expressed in a variety of cancer cell lines, Analysis of biopsy samples showed changes in expression of HtrA2 in cancer tissues compared with normal tissues.

HtrA2 has recently been identified as a gene related to Parkinson's disease. Mutations in Htra2 have been found in patients with Parkinson's disease. Additionally, mice lacking HtrA2 have a parkinsonian phenotype. This suggests that HtrA2 is linked to Parkinson's disease progression in humans and mice.

Interactions

HtrA serine peptidase 2 has been shown to interact with MAPK14, XIAP and BIRC2.

Further reading

• Zurawa-Janicka D, Narkiewicz J, Lipińska B (2007). "[Characterization of the HtrA family of proteins]". Postepy Biochemii. 53 (1): 27–36. PMID 17718385.
• Maruyama K, Sugano S (Jan 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
• Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (Oct 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149.
• Savopoulos JW, Carter PS, Turconi S, Pettman GR, Karran EH, Gray CW, Ward RV, Jenkins O, Creasy CL (Jul 2000). "Expression, purification, and functional analysis of the human serine protease HtrA2". Protein Expression and Purification. 19 (2): 227–34. doi:10.1006/prep.2000.1240. PMID 10873535.
• Faccio L, Fusco C, Viel A, Zervos AS (Sep 2000). "Tissue-specific splicing of Omi stress-regulated endoprotease leads to an inactive protease with a modified PDZ motif". Genomics. 68 (3): 343–7. doi:10.1006/geno.2000.6263. PMID 10995577.
• Suzuki Y, Imai Y, Nakayama H, Takahashi K, Takio K, Takahashi R (Sep 2001). "A serine protease, HtrA2, is released from the mitochondria and interacts with XIAP, inducing cell death". Molecular Cell. 8 (3): 613–21. doi:10.1016/S1097-2765(01)00341-0. PMID 11583623.
• Verhagen AM, Silke J, Ekert PG, Pakusch M, Kaufmann H, Connolly LM, Day CL, Tikoo A, Burke R, Wrobel C, Moritz RL, Simpson RJ, Vaux DL (Jan 2002). "HtrA2 promotes cell death through its serine protease activity and its ability to antagonize inhibitor of apoptosis proteins". The Journal of Biological Chemistry. 277 (1): 445–54. doi:10.1074/jbc.M109891200. PMID 11604410.
• Hegde R, Srinivasula SM, Zhang Z, Wassell R, Mukattash R, Cilenti L, DuBois G, Lazebnik Y, Zervos AS, Fernandes-Alnemri T, Alnemri ES (Jan 2002). "Identification of Omi/HtrA2 as a mitochondrial apoptotic serine protease that disrupts inhibitor of apoptosis protein-caspase interaction". The Journal of Biological Chemistry. 277 (1): 432–8. doi:10.1074/jbc.M109721200. PMID 11606597.
• Vucic D, Deshayes K, Ackerly H, Pisabarro MT, Kadkhodayan S, Fairbrother WJ, Dixit VM (Apr 2002). "SMAC negatively regulates the anti-apoptotic activity of melanoma inhibitor of apoptosis (ML-IAP)". The Journal of Biological Chemistry. 277 (14): 12275–9. doi:10.1074/jbc.M112045200. PMID 11801603.
• van Loo G, van Gurp M, Depuydt B, Srinivasula SM, Rodriguez I, Alnemri ES, Gevaert K, Vandekerckhove J, Declercq W, Vandenabeele P (Jan 2002). "The serine protease Omi/HtrA2 is released from mitochondria during apoptosis. Omi interacts with caspase-inhibitor XIAP and induces enhanced caspase activity". Cell Death and Differentiation. 9 (1): 20–6. doi:10.1038/sj.cdd.4400970. PMID 11803371.
• Li W, Srinivasula SM, Chai J, Li P, Wu JW, Zhang Z, Alnemri ES, Shi Y (Jun 2002). "Structural insights into the pro-apoptotic function of mitochondrial serine protease HtrA2/Omi". Nature Structural Biology. 9 (6): 436–41. doi:10.1038/nsb795. PMID 11967569. S2CID 21170905.
• Yang QH, Church-Hajduk R, Ren J, Newton ML, Du C (Jun 2003). "Omi/HtrA2 catalytic cleavage of inhibitor of apoptosis (IAP) irreversibly inactivates IAPs and facilitates caspase activity in apoptosis". Genes & Development. 17 (12): 1487–96. doi:10.1101/gad.1097903. PMC 196079. PMID 12815069.
• Srinivasula SM, Gupta S, Datta P, Zhang Z, Hegde R, Cheong N, Fernandes-Alnemri T, Alnemri ES (Aug 2003). "Inhibitor of apoptosis proteins are substrates for the mitochondrial serine protease Omi/HtrA2". The Journal of Biological Chemistry. 278 (34): 31469–72. doi:10.1074/jbc.C300240200. PMID 12835328.
• Suzuki Y, Takahashi-Niki K, Akagi T, Hashikawa T, Takahashi R (Feb 2004). "Mitochondrial protease Omi/HtrA2 enhances caspase activation through multiple pathways". Cell Death and Differentiation. 11 (2): 208–16. doi:10.1038/sj.cdd.4401343. PMID 14605674.
• Okada M, Adachi S, Imai T, Watanabe K, Toyokuni SY, Ueno M, Zervos AS, Kroemer G, Nakahata T (Mar 2004). "A novel mechanism for imatinib mesylate-induced cell death of BCR-ABL-positive human leukemic cells: caspase-independent, necrosis-like programmed cell death mediated by serine protease activity". Blood. 103 (6): 2299–307. doi:10.1182/blood-2003-05-1605. hdl:2433/145297. PMID 14645012.
• Park HJ, Seong YM, Choi JY, Kang S, Rhim H (Feb 2004). "Alzheimer's disease-associated amyloid beta interacts with the human serine protease HtrA2/Omi". Neuroscience Letters. 357 (1): 63–7. doi:10.1016/j.neulet.2003.11.068. PMID 15036614. S2CID 12059062.
• Guo Y, Cheong N, Zhang Z, De Rose R, Deng Y, Farber SA, Fernandes-Alnemri T, Alnemri ES (Jun 2004). "Tim50, a component of the mitochondrial translocator, regulates mitochondrial integrity and cell death". The Journal of Biological Chemistry. 279 (23): 24813–25. doi:10.1074/jbc.M402049200. PMID 15044455.

External links

• The MEROPS online database for peptidases and their inhibitors: S01.278