Design and synthesis of new substrates of HtrA2 protease
Magdalena Wysocka1, Anna Wojtysiak1, Małgorzata Okońska1
1Faculty of Chemistry, University of Gdansk, 80-308 Gdansk, Poland.
Abstract:
HtrA2 belongs to the HtrA (high temperature requirement A) family of ATP-independent serine proteases. The primary function of HtrA2 includes maintaining the mitochondria homeostasis, cell death (by apoptosis, necrosis, or anoikis), and contribution to the cell signaling. Several recent reports have shown involvement of HtrA2 in development of cancer and neurodegenerative disorders. Here, we describe the profiling of HtrA2 protease substrate specificity via the combinatorial chemistry approach that led to the selection of novel intramolecularly quenched substrates. For all synthesized compounds, the highest HtrA2-mediated hydrolysis efficiency and selectivity among tested HtrA family members was observed for ABZ-Ile-Met-Thr-Abu-Tyr-Met-Phe-Tyr(3-NO2)-NH2, which displayed a specificity constant kcat/KM value of 14,535M(-1)s(-1).
Insights
Researchers profiled the substrate specificity of HtrA2 (high temperature requirement A2) protease, a key player in mitochondria homeostasis and cell death. They identified a novel substrate with high HtrA2-mediated hydrolysis efficiency and selectivity.
Area of Science:
- Biochemistry
- Enzymology
- Molecular Biology
Background:
- HtrA2 (high temperature requirement A2) is an ATP-independent serine protease crucial for mitochondrial homeostasis.
- Its functions extend to regulating cell death pathways (apoptosis, necrosis, anoikis) and cell signaling.
- Dysregulation of HtrA2 is implicated in cancer and neurodegenerative diseases.
Purpose of the Study:
- To profile the substrate specificity of the HtrA2 protease.
- To identify novel HtrA2 substrates using a combinatorial chemistry approach.
- To determine the efficiency and selectivity of HtrA2 activity against novel substrates.
Main Methods:
- Employed combinatorial chemistry to synthesize novel intramolecularly quenched substrates.
- Assessed HtrA2-mediated hydrolysis efficiency and selectivity for synthesized compounds.
- Compared HtrA2 activity against other HtrA family members.
Main Results:
- Identified a specific substrate, ABZ-Ile-Met-Thr-Abu-Tyr-Met-Phe-Tyr(3-NO2)-NH2, with superior HtrA2-mediated hydrolysis.
- This substrate exhibited the highest efficiency and selectivity among all tested compounds.
- A specificity constant (kcat/KM) of 14,535 M(-1)s(-1) was determined for HtrA2 with the identified substrate.
Conclusions:
- The study successfully profiled HtrA2 substrate specificity, identifying a highly efficient and selective substrate.
- This finding provides a valuable tool for studying HtrA2 function and its role in disease.
- The identified substrate can be used for further biochemical and cellular investigations of HtrA2.
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