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Title: S -3-Carboxypropyl-l-cysteine specifically inhibits cystathionine γ-lyase–dependent hydrogen sulfide synthesis

Abstract

Hydrogen sulfide (H 2S) is a gaseous signaling molecule, which modulates a wide range of mammalian physiological processes. Cystathionine γ-lyase (CSE) catalyzes H 2S synthesis and is a potential target for modulating H 2S levels under pathophysiological conditions. CSE is inhibited by propargylglycine (PPG), a widely used mechanism-based inhibitor. In this study, we report that inhibition of H 2S synthesis from cysteine, but not the canonical cystathionine cleavage reaction catalyzed by CSE in vitro, is sensitive to preincubation of the enzyme with PPG. In contrast, the efficacy of S-3-carboxpropyl-L-cysteine (CPC) a new inhibitor described herein, was not dependent on the order of substrate/inhibitor addition. We observed that CPC inhibited the γ-elimination reaction of cystathionine and H2S synthesis from cysteine by human CSE with Ki values of 50 ± 3 and 180 ± 15 μM, respectively. We noted that CPC spared the other enzymes involved either directly (cystathionine β-synthase and mercaptopyruvate sulfurtransferase) or indirectly (cysteine aminotransferase) in H2S biogenesis. CPC also targeted CSE in cultured cells, inhibiting transsulfuration flux by 80–90%, as monitored by the transfer of radiolabel from [35S]methionine to GSH. The 2.5 Å resolution crystal structure of human CSE in complex with the CPC-derived aminoacrylate intermediate provided a structuralmore » framework for the molecular basis of its inhibitory effect. In summary, our study reveals a previously unknown confounding effect of PPG, widely used to inhibit CSE-dependent H 2S synthesis, and reports on an alternative inhibitor, CPC, which could be used as a scaffold to develop more potent H 2S biogenesis inhibitors.« less

Authors:
ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Institutes of Health (NIH)
OSTI Identifier:
1544848
Grant/Contract Number:  
HL58984; DK111465
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Biological Chemistry
Additional Journal Information:
Journal Volume: 294; Journal Issue: 28; Journal ID: ISSN 0021-9258
Publisher:
American Society for Biochemistry and Molecular Biology
Country of Publication:
United States
Language:
ENGLISH
Subject:
59 BASIC BIOLOGICAL SCIENCES; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; enzyme kinetics; crystal structure; pyridoxal phosphate; hydrogen sulfide; enzyme inhibitor; chemical screen; cystathionine gamma-lyase; cysteine catabolism; PLP enzyme; propargylglycine; transsulfuration pathway

Citation Formats

Yadav, Pramod K., Vitvitsky, Victor, Kim, Hanseong, White, Andrew, Cho, Uhn-Soo, and Banerjee, Ruma. S -3-Carboxypropyl-l-cysteine specifically inhibits cystathionine γ-lyase–dependent hydrogen sulfide synthesis. United States: N. p., 2019. Web. doi:10.1074/jbc.RA119.009047.
Yadav, Pramod K., Vitvitsky, Victor, Kim, Hanseong, White, Andrew, Cho, Uhn-Soo, & Banerjee, Ruma. S -3-Carboxypropyl-l-cysteine specifically inhibits cystathionine γ-lyase–dependent hydrogen sulfide synthesis. United States. https://doi.org/10.1074/jbc.RA119.009047
Yadav, Pramod K., Vitvitsky, Victor, Kim, Hanseong, White, Andrew, Cho, Uhn-Soo, and Banerjee, Ruma. Mon . "S -3-Carboxypropyl-l-cysteine specifically inhibits cystathionine γ-lyase–dependent hydrogen sulfide synthesis". United States. https://doi.org/10.1074/jbc.RA119.009047. https://www.osti.gov/servlets/purl/1544848.
@article{osti_1544848,
title = {S -3-Carboxypropyl-l-cysteine specifically inhibits cystathionine γ-lyase–dependent hydrogen sulfide synthesis},
author = {Yadav, Pramod K. and Vitvitsky, Victor and Kim, Hanseong and White, Andrew and Cho, Uhn-Soo and Banerjee, Ruma},
abstractNote = {Hydrogen sulfide (H2S) is a gaseous signaling molecule, which modulates a wide range of mammalian physiological processes. Cystathionine γ-lyase (CSE) catalyzes H2S synthesis and is a potential target for modulating H2S levels under pathophysiological conditions. CSE is inhibited by propargylglycine (PPG), a widely used mechanism-based inhibitor. In this study, we report that inhibition of H2S synthesis from cysteine, but not the canonical cystathionine cleavage reaction catalyzed by CSE in vitro, is sensitive to preincubation of the enzyme with PPG. In contrast, the efficacy of S-3-carboxpropyl-L-cysteine (CPC) a new inhibitor described herein, was not dependent on the order of substrate/inhibitor addition. We observed that CPC inhibited the γ-elimination reaction of cystathionine and H2S synthesis from cysteine by human CSE with Ki values of 50 ± 3 and 180 ± 15 μM, respectively. We noted that CPC spared the other enzymes involved either directly (cystathionine β-synthase and mercaptopyruvate sulfurtransferase) or indirectly (cysteine aminotransferase) in H2S biogenesis. CPC also targeted CSE in cultured cells, inhibiting transsulfuration flux by 80–90%, as monitored by the transfer of radiolabel from [35S]methionine to GSH. The 2.5 Å resolution crystal structure of human CSE in complex with the CPC-derived aminoacrylate intermediate provided a structural framework for the molecular basis of its inhibitory effect. In summary, our study reveals a previously unknown confounding effect of PPG, widely used to inhibit CSE-dependent H2S synthesis, and reports on an alternative inhibitor, CPC, which could be used as a scaffold to develop more potent H2S biogenesis inhibitors.},
doi = {10.1074/jbc.RA119.009047},
url = {https://www.osti.gov/biblio/1544848}, journal = {Journal of Biological Chemistry},
issn = {0021-9258},
number = 28,
volume = 294,
place = {United States},
year = {2019},
month = {6}
}

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