扩大碳聚合的酶工具箱:增加"分裂"的跨基酶序列空间多样性的增加
Alessia Tonoli1, Silvia Anselmi2, John M Ward1
1Department of Biochemical Engineering, University College London, Bernard Katz Building, Gower Street, London, W1CE 6BT, United Kingdom.
Chembiochem : a European journal of chemical biology
|January 31, 2025
概括
研究人员发现了近500个新的分裂转基因酶 (TK) 对,使已知的谱系扩大了14倍. 两种高热性TK表现出显著的热稳定性,在长时间暴露于热量后保持活性.
科学领域:
- 酶学 是一种酶学.
- 生物催化剂是一种生物催化剂.
- 蛋白质工程是指蛋白质工程.
背景情况:
- 转基因酶 (TKs) 是依赖胺二酸盐 (ThDP) 的酶,对于转移二碳单元至关重要.
- 虽然大多数TK都是全长的蛋白质,但在古生物和细菌中存在一个独特的"分裂"TK类,作为两个独立的子单元.
- 了解分裂的TC提供了对酶功能,反应性和潜在的生物催化剂应用的见解.
研究的目的:
- 显著扩大已知多样性的分裂的技术知识.
- 通过实验来表征生物催化剂的新型分裂TK候选物.
- 调查分割TK的结构和功能特性,特别是它们的热稳定性.
主要方法:
- 生物信息分析用于识别假定分裂的TK子单元对.
- 基因组和元基因组数据挖掘用于新型酶发现.
- 克隆,蛋白质表达,净化和酶活性测试.
- 在高温下对净化裂变TCK进行热稳定性测试.
主要成果:
- 识别和目录了大约500个新的假定分裂的TK子单元对,已知曲目增加了约14倍.
- 实验性地描述了十个分裂的TK候选者,使测试酶的数量翻了一番.
- 发现了两种超热友分裂TKs (pQR2809和pQR2812),表现出增强的热稳定性,在90°C和100°C下分别在1小时后保持活性.
结论:
- 这项研究大大扩大了已知的分裂TK的范围,为酶发现提供了宝贵的资源.
- 实验验证证证实了分裂TC作为生物催化剂的潜力,新型候选物显示出有希望的稳定性.
- 已识别的高热友分裂TC代表了需要高温酶化过程的工业应用的有希望的候选者.
相关概念视频
Translesion DNA Polymerases
9.8K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
9.8K
Preparation of Diols and Pinacol Rearrangement
3.3K
Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.
3.3K
Keto–Enol Tautomerism: Mechanism
5.1K
The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed conditions. Both the reactions involve the same steps—protonation and deprotonation— although in the reverse order.
5.1K
Cofactors and Coenzymes
80.9K
Enzymes require additional components for proper function. There are two such classes of molecules: cofactors and coenzymes. Cofactors are metallic ions and coenzymes are non-protein organic molecules. Both of these types of helper molecule can be tightly bound to the enzyme or bound only when the substrate binds.
80.9K
Aldol Condensation with β-Diesters: Knoevenagel Condensation
2.9K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
2.9K
Ketones with Nonenolizable Aromatic Aldehydes: Claisen–Schmidt Condensation
3.7K
Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt...
As the self-condensation of ketones is generally not favored in basic conditions, the self-condensed products do not form in the reaction between ketones and benzaldehyde. The general reaction of Claisen–Schmidt...
3.7K


