一个具有中等氧潜力的新型双域:物理化学和结构性质
Liubov I Trubitsina1, Ivan V Trubitsin2, Alexander V Lisov2
1Federal Research Center "Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences", Skryabin Institute of Biochemistry and Physiology of Microorganisms of the Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. lyubov_yurevich@mail.ru.
Biochemistry. Biokhimiia
|December 17, 2023
概括
从Streptomyces carpinensis中特征了一种新型的两个域的laccase,ScaSL. 这种酶表现出独特的多分子活性,高热稳定性和中等氧化还原潜力,为工业应用提供了新的可能性.
科学领域:
- 生物化学和分子生物学
- 酶学 是一种酶学.
- 微生物生物技术 微生物生物技术
背景情况:
- 乳酶是多铜氧化酶,具有多种工业应用.
- 双域乳糖是一种独特的子类,但它们的特性较少被探索.
- Streptomyces 种类是已知的新型酶的来源.
研究的目的:
- 鉴定和描述一种来自Streptomyces carpinensis的新型双域乳.
- 为了研究酶的生物化学特性,包括活性,稳定性和还氧化潜力.
- 阐明其独特特征的结构基础.
主要方法:
- 在大肠杆菌中基因鉴定和异质表达.
- 使用亲和染色学净化酶.
- 对活性,稳定性,pH最佳值和基质特异性的生物化学测试.
- 确定动力参数 (Km,kcat) 和氧化还原潜力.
- 用于结构分析的X射线晶体学.
主要成果:
- 一种新型的双域乳糖酶,ScaSL,已成功表达和净化.
- 在多重体形式中,ScaSL表现出独特的活性,与同类体活性一起.
- 该酶表现出高热稳定性 (在80°C的最佳活性) 和广泛的pH稳定性 (pH9-11).
- ScaSL催化了酸和素的聚合.
- 确定的氧化还原潜力 (0.472 ± 0.007 V) 被归类为中等,这是两个域的laccases中的第一个.
- 晶体结构揭示了与氨基酸残留230.0相关的中 redox 潜力的潜在结构基础.
结论:
- ScaSL是第一个具有中等氧化还原潜力的两域乳酶的特征.
- 其独特的特性,包括热稳定性和多重体活性,使其成为生物技术应用的有希望的候选者.
- 结构洞察力为理解和设计laccase功能提供了基础.
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