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Old yellow enzymes, highly homologous FMN oxidoreductases with modulating roles in oxidative stress and programmed cell death in yeast.
J Biol Chem. 2007 Dec 07; 282(49):36010-23.JB

Abstract

In a genetic screen to identify modifiers of Bax-dependent lethality in yeast, the C terminus of OYE2 was isolated based on its capacity to restore sensitivity to a Bax-resistant yeast mutant strain. Overexpression of full-length OYE2 suppresses Bax lethality in yeast, lowers endogenous reactive oxygen species (ROS), increases resistance to H(2)O(2)-induced programmed cell death (PCD), and significantly lowers ROS levels generated by organic prooxidants. Reciprocally, Delta oye2 yeast strains are sensitive to prooxidant-induced PCD. Overexpression and knock-out analysis indicate these OYE2 antioxidant activities are opposed by OYE3, a highly homologous heterodimerizing protein, which functions as a prooxidant promoting H(2)O(2)-induced PCD in wild type yeast. To exert its effect OYE3 requires the presence of OYE2. Deletion of the 12 C-terminal amino acids and catalytic inactivation of OYE2 by a Y197F mutation enhance significantly survival upon H(2)O(2)-induced PCD in wild type cells, but accelerate PCD in Delta oye3 cells, implicating the oye2p-oye3p heterodimer for promoting cell death upon oxidative stress. Unexpectedly, a strain with a double knock-out of these genes (Delta oye2 oye3) is highly resistant to H(2)O(2)-induced PCD, exhibits increased respiratory capacity, and undergoes less cell death during the adaptive response in chronological aging. Simultaneous deletion of OYE2 and other antioxidant genes hyperinduces endogenous levels of ROS, promoting H(2)O(2)-induced cell death: in Delta oye2 glr1 yeast high levels of oxidized glutathione elicited gross morphological aberrations involving the actin cytoskeleton and defects in organelle partitioning. Altering the ratio of reduced to oxidized glutathione by exogenous addition of GSH fully reversed these alterations. Based on this work, OYE proteins are firmly placed in the signaling network connecting ROS generation, PCD modulation, and cytoskeletal dynamics in yeast.

Authors+Show Affiliations

Department of Natural Products, Mediterranean Agronomic Institute of Chania, Chania 73100, Greece.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

17897954

Citation

Odat, Osama, et al. "Old Yellow Enzymes, Highly Homologous FMN Oxidoreductases With Modulating Roles in Oxidative Stress and Programmed Cell Death in Yeast." The Journal of Biological Chemistry, vol. 282, no. 49, 2007, pp. 36010-23.
Odat O, Matta S, Khalil H, et al. Old yellow enzymes, highly homologous FMN oxidoreductases with modulating roles in oxidative stress and programmed cell death in yeast. J Biol Chem. 2007;282(49):36010-23.
Odat, O., Matta, S., Khalil, H., Kampranis, S. C., Pfau, R., Tsichlis, P. N., & Makris, A. M. (2007). Old yellow enzymes, highly homologous FMN oxidoreductases with modulating roles in oxidative stress and programmed cell death in yeast. The Journal of Biological Chemistry, 282(49), 36010-23.
Odat O, et al. Old Yellow Enzymes, Highly Homologous FMN Oxidoreductases With Modulating Roles in Oxidative Stress and Programmed Cell Death in Yeast. J Biol Chem. 2007 Dec 7;282(49):36010-23. PubMed PMID: 17897954.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Old yellow enzymes, highly homologous FMN oxidoreductases with modulating roles in oxidative stress and programmed cell death in yeast. AU - Odat,Osama, AU - Matta,Samer, AU - Khalil,Hadi, AU - Kampranis,Sotirios C, AU - Pfau,Raymond, AU - Tsichlis,Philip N, AU - Makris,Antonios M, Y1 - 2007/09/26/ PY - 2007/9/28/pubmed PY - 2008/1/18/medline PY - 2007/9/28/entrez SP - 36010 EP - 23 JF - The Journal of biological chemistry JO - J Biol Chem VL - 282 IS - 49 N2 - In a genetic screen to identify modifiers of Bax-dependent lethality in yeast, the C terminus of OYE2 was isolated based on its capacity to restore sensitivity to a Bax-resistant yeast mutant strain. Overexpression of full-length OYE2 suppresses Bax lethality in yeast, lowers endogenous reactive oxygen species (ROS), increases resistance to H(2)O(2)-induced programmed cell death (PCD), and significantly lowers ROS levels generated by organic prooxidants. Reciprocally, Delta oye2 yeast strains are sensitive to prooxidant-induced PCD. Overexpression and knock-out analysis indicate these OYE2 antioxidant activities are opposed by OYE3, a highly homologous heterodimerizing protein, which functions as a prooxidant promoting H(2)O(2)-induced PCD in wild type yeast. To exert its effect OYE3 requires the presence of OYE2. Deletion of the 12 C-terminal amino acids and catalytic inactivation of OYE2 by a Y197F mutation enhance significantly survival upon H(2)O(2)-induced PCD in wild type cells, but accelerate PCD in Delta oye3 cells, implicating the oye2p-oye3p heterodimer for promoting cell death upon oxidative stress. Unexpectedly, a strain with a double knock-out of these genes (Delta oye2 oye3) is highly resistant to H(2)O(2)-induced PCD, exhibits increased respiratory capacity, and undergoes less cell death during the adaptive response in chronological aging. Simultaneous deletion of OYE2 and other antioxidant genes hyperinduces endogenous levels of ROS, promoting H(2)O(2)-induced cell death: in Delta oye2 glr1 yeast high levels of oxidized glutathione elicited gross morphological aberrations involving the actin cytoskeleton and defects in organelle partitioning. Altering the ratio of reduced to oxidized glutathione by exogenous addition of GSH fully reversed these alterations. Based on this work, OYE proteins are firmly placed in the signaling network connecting ROS generation, PCD modulation, and cytoskeletal dynamics in yeast. SN - 0021-9258 UR - https://www.unboundmedicine.com/medline/citation/17897954/Old_yellow_enzymes_highly_homologous_FMN_oxidoreductases_with_modulating_roles_in_oxidative_stress_and_programmed_cell_death_in_yeast_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0021-9258(20)62137-8 DB - PRIME DP - Unbound Medicine ER -