素的α组分中的小胞体交叉链的结构
Shweta Kishen1, Garima Dhiman1, Youran Luo2
1Department of Biochemistry, Hargobind Khorana block, Sector-25, South Campus, Panjab University, Chandigarh-160014, India.
Journal of natural products
|February 16, 2026
概括
这项研究确定了素中特定的乙烯交叉链接,素是一种具有协同抗菌活性的抗生素. 了解这些氨酸和甲基氨酸环是其强大的抗微生物功能的关键.
科学领域:
- 微生物学 微生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 素是一种由 *Streptomyces roseosporus* 生产的新型抗菌剂.
- 它由两种 (Rosα和Rosβ) 组成,对抗阳性病原体具有协同活性.
- 兰西生物的特点是乙烯交叉链,包括兰西 (Lan) 和甲基兰西 (MeLan).
研究的目的:
- 系统地分配roseocin.com的α成分的环形图案.
- 研究特定的氨酸和甲基氨酸环在素的结构和生物活性中的作用.
- 为了阐明乙烯交叉链的立体化学.
主要方法:
- 用局部导向的突变生成来创建六个单个环变体的α通过替换关键的Ser/Thr和Cys残留与Ala.
- 马菲的分析被用来确定兰因和甲基兰因残留物的立体化学.
- 进行了最小抑制度 (MIC) 测试,以评估环中断对生物活性的影响.
主要成果:
- 这项研究提出了红素α的特定环形模式:Cys10-Ser2 (Lan环A),Cys11-Thr7 (MeLan环B),Ser18-Cys23 (Lan环C) 和Thr21-Cys27 (MeLan环D).
- 所有已识别的氨酸和甲基氨酸残留物都具有DL立体化学.
- 氨酸环的破坏显著影响了氨酸的结构和生物活性,而甲基氨酸环虽然可消耗,但对于最佳活性很重要,因为它们的破坏增加了MIC值.
结论:
- 素中氨酸和甲基氨酸环的精确排列对于其协同抗菌功效至关重要.
- 两种氨酸环的形成对于实现活动必不可少的本土环形状显得尤为决定性.
- 这项研究提供了对抗生素结构功能关系的关键见解,有助于开发新型抗菌剂.
相关概念视频
Preparation of Epoxides
9.4K
Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
9.4K
Preparation and Reactions of Thiols
7.6K
Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
7.6K
Structure and Nomenclature of Thiols and Sulfides
5.8K
Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry,...
5.8K
Structure and Nomenclature of Epoxides
8.1K
Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain...
8.1K
β-Dicarbonyl Compounds via Crossed Claisen Condensations
3.9K
Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
3.9K
Preparation and Reactions of Sulfides
5.9K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.9K


![Solid-phase Synthesis of [4.4] Spirocyclic Oximes](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F58508.jpg&w=3840&q=50)