González Carolina, Rodríguez Sebastián, Reyes-Godoy José Pablo, Razmilic Valeria, Martínez Irene
Centre for Biotechnology and Bioengineering (CeBiB), Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago 8370459, Chile.
Int J Mol Sci. 2025 Jun 20;26(13):5940. doi: 10.3390/ijms26135940.
The Atacama Desert is emerging as an unexpected source of microbial life and, thus, a source of bioactive compounds and novel enzymes. Baeyer-Villiger monooxygenases (BVMOs), a subclass of flavin-dependent monooxygenases (FPMOs), have gained attention as promising biocatalysts for the biosynthesis of industrially relevant molecules for a wide range of applications, such as pharmaceuticals and polymers, among others. BVMOs catalyze the oxidation of ketones and cyclic ketones to esters and lactones, respectively, by using molecular oxygen and NAD(P)H. BVMOs may also catalyze heteroatoms oxidation including sulfoxidations and -oxidations. This work aims to search for novel BVMOs in the genomes of new bacterial strains isolated from the Atacama Desert. Bioinformatic analysis led to the identification of 10 putative BVMOs, where the monooxygenase named MO-G35A was selected. Genome context showed, downstream of the MO-G35A, a gene encoding for an enzyme from the short-chain dehydrogenase/reductase family, suggesting a closer redox loop between both enzymes. MO-G35A was successfully expressed in three expression systems, where higher yields were achieved using the Shuffle T7 as host, suggesting that correct disulfide bond formation is necessary for correct folding. Enzyme characterization showed that it operates optimally at 35-38 °C, exhibiting a of 0.06 mM and a of 0.15 s for bicyclo [3.2.0] hept-2-en-6-one (BHC). Furthermore, the study revealed high stability in the presence of organic solvents, making it suitable for applications in various industrial processes, especially when the substrates have poor solubility in aqueous solutions. These results highlight the robustness and adaptability of enzymes in extreme environments, making them valuable candidates for biotechnological applications.
阿塔卡马沙漠正成为微生物生命的一个意想不到的来源,因此也是生物活性化合物和新型酶的来源。拜耳-维利格单加氧酶(BVMOs)是黄素依赖性单加氧酶(FPMOs)的一个亚类,作为一种有前景的生物催化剂,可用于生物合成多种工业相关分子,如药物和聚合物等,已受到关注。BVMOs分别利用分子氧和NAD(P)H将酮和环酮氧化为酯和内酯。BVMOs还可催化杂原子氧化,包括硫氧化和氮氧化。这项工作旨在从阿塔卡马沙漠分离出的新细菌菌株的基因组中寻找新型BVMOs。生物信息学分析鉴定出10种假定的BVMOs,其中选择了名为MO-G35A的单加氧酶。基因组背景显示,在MO-G35A的下游,有一个编码短链脱氢酶/还原酶家族酶的基因,这表明两种酶之间存在更紧密的氧化还原循环。MO-G35A在三种表达系统中成功表达,以Shuffle T7作为宿主时产量更高,这表明正确的二硫键形成对于正确折叠是必要的。酶的表征表明,它在35-38℃下最佳运行,对双环[3.2.0]庚-2-烯-6-酮(BHC)的Km为0.06 mM,kcat为0.15 s-1。此外,该研究还揭示了其在有机溶剂存在下具有高稳定性,使其适用于各种工业过程,特别是当底物在水溶液中的溶解度较差时。这些结果突出了极端环境中酶的稳健性和适应性,使其成为生物技术应用的有价值候选者。