期刊
BIOCHEMISTRY
卷 52, 期 28, 页码 4774-4780出版社
AMER CHEMICAL SOC
DOI: 10.1021/bi400652c
关键词
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资金
- Ministry of Education, Culture, Sports, Science, and Technology of Japan [25440194]
- New Energy and Industrial Technology Development Organization (NEDO) of Japan [09A03002]
- Grants-in-Aid for Scientific Research [25440194] Funding Source: KAKEN
Proteins from thermophiles possess high thermostability. The stabilization mechanisms differ between archaeal and bacterial proteins, whereby archaeal proteins are mainly stabilized via hydrophobic interactions and bacterial proteins by ion pairs. High stability is an important factor in promoting protein evolution, but the precise means by which different stabilization mechanisms affect the evolution process remain unclear. In this study, we investigated a random mutational drift of esterases from thermophilic archaea and bacteria at high temperatures. Our results indicate that mutations in archaeal proteins lead to improved function with no loss of stability, while mutant bacterial proteins are largely destabilized with decreased activity at high temperatures. On the basis of these findings, we suggest that archaeal proteins possess higher evolvability than bacterial proteins under temperature selection and are additionally able to evolve into eukaryotic proteins.
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