Selective Usage of Isozymes for Stress Response.
Selective Usage of Isozymes for Stress Response.
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选择性使用同工酶进行应激反应。
DOI:
10.1021/acschembio.8b00767
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发表时间:
2018
影响因子:
4
通讯作者:
Lin,Hening
中科院分区:
文献类型:
--
作者:
Zhang,Yugang;Lin,Zhewang;Wang,Miao;Lin,Hening
Isozymes are enzymes with similar sequences that catalyze the same reaction in a given species. InSaccharomyces cerevisiae, most isozymes have major isoforms with high expression levels and minor isoforms with little expression under normal growth conditions. In a proteomic study aimed at identifying yeast protein regulated by rapamycin, we found an interesting phenomenon, that, for several metabolic enzymes, the major isozymes are downregulated while the minor isozymes are upregulated. Through enzymological and biochemical studies, we demonstrate that a rapamycin-upregulated enolase isozyme (ENO1) favors gluconeogenesis and a rapamycin-upregulated alcohol dehydrogenase isozyme (ALD4) promotes the reduction of NAD+to NADH (instead of NADP+to NADPH). Gene deletion study in yeast showed that the ENO1 and ALD4 are important for yeast survival under less-favorable growth conditions. Therefore, our study highlights the different metabolic needs of cells under different conditions and how nature chooses different isozymes to fit the metabolic needs.
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