通过全细胞CoA激活-乙转移酶级联,通过基脂肪酸的水相聚凝结
Shuming Jin1,2,3,4,5, Dong Lu1, Qiuyang Wu1
1College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
JACS Au
|February 27, 2026
概括
这项研究提出了一种新型的全细胞生物催化剂,用于从水中的未激活的酸脂肪酸中合成聚酸脂肪酸 (PHFA). 这种绿色化学方法克服了水解的局限性,使高分子量高效的聚生产成为可能.
科学领域:
- 生物催化和代谢工程 生物催化和代谢工程
- 聚合物化学 聚合物化学
- 绿色化学 绿色化学
背景情况:
- 在温和条件下,水相聚形成受到不利的化-水解平衡的阻碍.
- 现有的水性化方法仅限于小分子或需要预先激活的基质.
- 原生聚酸 (PHA) 途径仅限于短链单体,这对更广泛的聚合成构成了挑战.
研究的目的:
- 开发一种高效,完全水性,全细胞的方法,从未激活的氧脂肪酸中合成高摩尔质量聚.
- 设计一种新型的生物催化级联,用于聚氧脂肪酸 (PHFA) 生物合成.
- 为了克服水解平衡的局限性,在使用全细胞催化剂的凝结聚合过程中使用全细胞催化剂.
主要方法:
- 在整个细胞催化剂中构建细胞内CoA激活/乙转移酶级联 (ACOS5At-WS2Mh) 的过程.
- 在工程级联中对基质识别,激活和链生长的机械分析.
- 底盘工程,催化优化和融合蛋白策略,以提高级联流量和产品标位.
主要成果:
- 一个功能性的全细胞催化剂被用于生物合成的多酸脂肪酸 (PHFA).
- 工程级联证明了水中的 ω-基脂肪酸的有效识别和激活.
- 在优化条件下,PHFA标位为1.87g L-1,具有高摩尔质量 (Mn,app = 10.8 kDa) 和低分散性 (Đ = 1.05).
结论:
- 这项工作建立了一条绿色,完全水性,全细胞路径,用于从未激活的 ω-基脂肪酸中生产非PHA聚合物.
- 该研究提供了工程活催化剂的设计原则,以克服凝聚聚合物聚合中的水解限制.
- 开发的系统为聚合成提供了一个可持续的替代方案,产生具有异质链末端的聚合物.
相关概念视频
01:13Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
4.2K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
4.2K
01:28Overview of Fatty Acid Metabolism
37.4K
Lipids also are sources of energy that power cellular processes. Like carbohydrates, lipids are composed of carbon, hydrogen, and oxygen, but these atoms are arranged differently. Most lipids are nonpolar and hydrophobic. Major types include fats and oils, waxes, phospholipids, and steroids.
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
Fatty acids are catabolized in a process called beta-oxidation, which takes place in the matrix of the mitochondria and converts their fatty acid chains into two-carbon units of acetyl groups. The acetyl...
37.4K
01:20Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview
20.9K
The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
20.9K
01:13Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism
10.2K
Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
10.2K
01:19α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview
3.3K
The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
3.3K
01:01Acid Halides to Carboxylic Acids: Hydrolysis
3.7K
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic...
3.7K