一个自给自足的β-Methylarginine生物合成途径在植物菌体中
Darwin Daniel Lara1, Bryan Tianzuo Zeng2, Yang Hai1,2
1Interdisciplinary Program in Quantitative Biosciences, University of California Santa Barbara, Santa Barbara, CA, 93106, USA.
Chembiochem : a European journal of chemical biology
|June 16, 2025
概括
科学家们发现了细菌制造β-甲基氨基酸 (β-MAA) 的新方法. 这一发现揭示了Planctomycetes细菌中的新型酶,扩大了这些重要化合物的已知途径.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 代谢学 代谢学 代谢学
背景情况:
- β-甲基氨基酸 (β-MAA) 是非正规的氨基酸,已知可以增强天然产品的生物活性,并具有固有的药理价值.
- 在Gammaproteobacteria和Actinomycetes中已经确定了β-MAA的生物合成途径,但其他细菌系仍未得到充分研究.
- 探索新的微生物血统对于发现新的二次代谢物和生物合成能力至关重要.
研究的目的:
- 在尚未探索的细菌类中识别新的β-MAA生物合成基因集群.
- 描述参与植物菌体中β-甲基氨酸生物合成的酶和机制.
- 扩大对β-MAA生产中的催化多样性的理解.
主要方法:
- 基因组挖掘用于识别潜在的生物合成基因集群.
- 涉及异质表达或本地宿主特征的体内研究.
- 在体外酶分析以确认酶活性和反应机制.
主要成果:
- 在植物系Planctomycetes中发现了一种用于β-methylarginine的新生物合成基因集群.
- 鉴定了两个关键酶,一种转氨酶 (PlaA) 和一种甲基转移酶 (PlaB),负责β-MAA合成.
- 证明PlaA-PlaB酶级联独立运作,不需要额外的酸或氨基酸基质.
结论:
- 植物菌体具有独特且自给自足的酶系统,用于β-甲基氨酸生物合成.
- 这一发现扩大了已知的β-MAA生产的催化谱.
- 浮游生物体代表了一个有前途的新来源,用于发现各种二次代谢产物.
更多相关视频
07:59A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
Published on: October 4, 2019
10.0K
14:42Liquid Chromatography Coupled to Refractive Index or Mass Spectrometric Detection for Metabolite Profiling in Lysate-based Cell-free Systems
Published on: September 23, 2021
5.1K
相关概念视频
Amino Acid Biosynthetic Pathways
165
Amino acid biosynthesis is essential for cell growth, protein synthesis, and metabolic regulation. Cells generate essential and non-essential amino acids from metabolic intermediates to sustain vital biological functions. These intermediates originate from key metabolic pathways: glycolysis, the tricarboxylic acid (TCA) cycle, and the pentose phosphate pathway. Important precursors include α-ketoglutarate, pyruvate, oxaloacetate, phosphoenolpyruvate, and erythrose-4-phosphate, which...
165
Amino Acid Catabolism
213
Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
213
Biosynthesis in Bacteria
122
Biosynthesis in bacteria is a fundamental anabolic process that generates essential macromolecules, including proteins, nucleic acids, lipids, and polysaccharides. These macromolecules are critical for cellular growth, replication, and function. The process is tightly regulated and energetically linked to catabolic pathways to ensure optimal resource utilization.Biosynthetic pathways begin with precursor metabolites such as pyruvate, acetyl-CoA, and glucose-6-phosphate derived from glycolysis,...
122
Inorganic Nitrogen Assimilation
118
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
118
Respiration Pathways
221
Cellular respiration is a fundamental metabolic process that enables organisms to generate energy from organic molecules. One of its central pathways is the tricarboxylic acid (TCA) cycle, also known as the Krebs cycle, which plays a crucial role in energy production and biosynthetic processes.Conversion of Pyruvate to Acetyl-CoAThe pyruvate generated from glycolysis undergoes oxidative decarboxylation by the pyruvate dehydrogenase complex, producing acetyl-CoA, one molecule of NADH, and one...
221
Sulfur Assimilation
80
Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...
80
