2021-09-18Our another new paper was published on Angew. Chem. Intl. Ed.. Congratulations to the authors!
Our new paper was published on Angewandte Chemie International Edition recently. In this study, we analyze the activities of three representative CYP152 peroxygenases (OleTJE, P450SPα and P450BSβ) towards cis- and trans-dodecenoic acids as substrate probes. The unexpected 6S-hydroxylation of the trans-isomer and 4R-hydroxylation of the cis-isomer by OleTJE, and molecular docking results suggested that the unprecedented selectivity is likely due to OleTJE 's preference of C2-C3 cis-configuration. More surprisingly, in addition to the common epoxide products, undecanal is the unexpected major product of P450SPα and P450BSβ regardless the cis/trans-configuration of substrates. The combined isotopically-labeled H218O2 tracing experiments, MD simulations and QM/MM calculations unravel an unusual mechanism for Compound I-mediated aldehyde formation, in which the active site water derived from H2O2 activation is involved in the generation of a four-membered ring lactone intermediate. These findings provide new insights into the unusual mechanisms of CYP152 peroxygenases. (Angew. Chem. Intl. Ed. 2021, https://onlinelibrary.wiley.com/doi/10.1002/anie.202111163.)
2021-09-18Biosynthesis of chuangxinmycin featuring a deubiquitinase-like sulfurtransferase
Our new paper was published on Angewandte Chemie International Edition recently. In this study, we resolved the central biosynthetic problem of enzymatic mechanism for sulfur incorporation by in vitro biochemical characterization of the key enzymes, and reconstitute the TPI skeleton in a one-pot enzymatic reaction. Particularly, we revealed that the JAMM/MPN+ protein Cxm3 functions as a deubiquitinase-like sulfurtransferase to catalyze a non-classical sulfur-transfer reaction by interacting with the ubiquitin-like sulfur carrier protein Cxm4GG. This finding adds a new mechanism for sulfurtransferase in nature. (Angew. Chem. Intl. Ed. 2021, https://onlinelibrary.wiley.com/doi/10.1002/ange.202107745.)
2021-09-06Our new paper was published on Science China Life Sciences. Congratulations to the authors!
Recently, our new paper was published on Science China Life Sciences. In this study, we designed a novel “multi-enzymes-for-multi-substrates” (MEMS) DE model and establish the proof-of concept by running a NE-mimicking and higher-throughput screening on the basis of “two-P450s-against-seven-substrates” (2P×7S) in one pot. With the multiplied throughput and improved hit rate, we witnessed a series of convergent evolution events of the two archetypal cytochrome P450 enzymes (P450 BM3 and P450cam) in laboratory. It is anticipated that the new strategy of MEMS DE will find broader application for a larger repertoire of enzymes in the future. Furthermore, structural and substrate docking analysis of the two functionally convergent P450 variants provide important insights into how distinct P450 active-sites can reach a common catalytic goal. (Sci. China Life Sci. 2021, https://doi.org/10.1007/s11427-021-1994-1.)
2021-05-26The public Open Day of the SKLMT held on May 22-25, 2021.
The 2nd public Open Day of the State Key Laboratory of Microbial Technology (SKLMT) held on May 22-25, 2021 at Shandong University. Our group showed visitors the experiment of enzymatic degradation process of plastic film by the specific microbe, which enabled visitors to experience science at a short range.
2021-03-12Cytochrome P450 enzymes in fungal natural product biosynthesis
Our new review was published on Natural Product Reports. In this review, we provide a comprehensive review to cover the most recent progresses from 2015 to 2020 on catalytic functions and mechanisms, research methodologies and remaining challenges in the fast-growing ﬁeld of fungal natural product biosynthetic P450s. (Nat. Prod. Rep. 2021. https://pubs.rsc.org/en/content/articlelanding/2021/np/d1np00004g#!divAbstract)
Prof. Jing Wu from State Key Laboratory of Food Science and Technology, Jiangnan University was invited to give a lecture of "New Technology of Industrial Enzyme Fermentation and Its Application" at Microbial Technology Institute of Shandong University.
2020-10-282020 Annual Meeting of the Chinese Society for Microbiology
On October 23-27, 2020, the 2020 Annual Meeting of the Chinese Society for Microbiology was held in Chengdu. The theme of the meeting is microbiology and great health. A total of 13 teachers and students in our group attended the meeting. Prof. Wei Zhang was invited to give a lecture. In poster session, our group members displayed 9 posters and had positive discussion with the participants.
2020-06-07Welcome students back home !
Starting from May 18, Shandong University students can begin returning to campus in batches. For the prevention and control of the epidemic situation on campus with students returning to school, SDU has formulated special work and emergency plans. At the same time, our lab will actively cooperate with SDU to do a good job in students management, including back-to-school approval, school entry, teaching and research arrangements, health monitoring, daily sanitation and disinfection, and laboratory management.
2020-05-19Fungal-derived brevianamide assembly by a stereoselective semipinacolase
Recently, our new paper was published on Nature Catalysis in collaboration with Prof. David Sherman’s group from University of Michigan and Prof. Robert Williams’s group from University of Oxford. In this study, we have identified the brevianamide A biosynthetic gene cluster from Penicillium brevicompactum NRRL 864 and elucidated the metabolic pathway. BvnE was revealed to be an essential isomerase/semipinacolase that specifies the selective production of the natural product. Structural elucidation, molecular modelling and mutational analysis of BvnE as well as quantum chemical calculations have provided mechanistic insights into the diastereoselective formation of the 3-spiro-ψ-indoxyl moiety in brevianamide A. This occurs through a BvnE-controlled semipinacol rearrangement and a subsequent spontaneous intramolecular [4+2] hetero-Diels–Alder cycloaddition. (Nat. Catal. 2020, https://doi.org/10.1038/s41929-020-0454-9)
2020-05-06Fragrant venezuelaenes: Discovery, biosynthesis, and mechanisms of central catalysts
Our new paper was published on ACS Catalysis. In this study, a cryptic terpenoid biosynthetic gene cluster ven was characterized from the model actinomycetic strain Streptomyces venezuelae ATCC 15439 through a genome mining approach. Silent gene activation and heterologous expression of ven led to the discovery of two diterpene metabolites venezuelaene A (1 ) and B (2 , 5-oxo-venezuelaene A), both of which bear a 5−5−6−7 tetracyclic skeleton and show fragrance. A class I diterpene synthase VenA with an atypical 115 DSFVSD120 motif was revealed to catalyze the cyclization of geranylgeranyl pyrophosphate (GGPP) generated by the GGPP synthase VenD, giving rise to 1. The unique cyclization mechanism was elucidated by 13 C-tracer NMR experiments. The oxidative transformation of 1 into 2 was also characterized to be mediated by the cytochrome P450 enzyme VenC. (ACS Catal. 2020, 10, 5846-5851. https://pubs.acs.org/doi/10.1021/acscatal.0c01575)
2020-03-18Opinion- Redox partners: Function modulators of bacterial P450 enzymes
Per the invitation from Trends in Microbiology, we published an Opinion article entitled "Redox partners: Function modulators of bacterial P450 enzymes" together with Prof. Rita Bernhardt from Saarland University. This article introduced the arising trend to treat bacterial redox partners as important P450 function modulators in addition to the auxiliary electron transfer proteins. (Trends Microbiol. 2020. https://www.sciencedirect.com/science/article/pii/S0966842X20300482)
2020-03-16Establishing an enzyme cascade for one-pot production of α-olefns
Our new paper was published on Biotechnology for Biofuels. In this study, a novel enzyme cascade was developed for one-pot production of α-olefns from low-cost triacylglycerols (TAGs) and natural oils without exogenous H2O2 addition. This artificial biocatalytic route consists of a lipase (CRL, AOL or Lip2) for TAG hydrolysis to produce glycerol and free fatty acids (FFAs), an alditol oxidase (AldO) for H2O2 generation upon glycerol oxidation, and the P450 fatty acid decarboxylase OleTJE for FFA decarboxylation using H2O2 generated in situ. The multi-enzyme system was systematically optimized leading to the production of α-olefns with the conversion rates ranging from 37.2 to 68.5%. Furthermore, a reaction using lyophilized CRL/OleTJE/AldO enzymes at an optimized ratio (5 U/6 μM/30 μM) gave a promising α-olefn yield of 0.53 g/L from 1500 μM (~1 g/L) coconut oil. (Biotechnol. Biofuels. 2020, 12, 52. https://biotechnologyforbiofuels.biomedcentral.com/articles/10.1186/s13068-020-01684-1)
2020-01-08Directed evolution of P450 fatty acid decarboxylases via high-throughput screening
Our new methodology paper showed up on Chemcatchem. In this study, we devised a catalase-deficient Escherichia coli host strain and reported an HTS approach based on colorimetric detection of H2O2-consumption activity of P450 fatty acid decarboxylases (FADCs). Directed evolution enabled by this method has led to effective identification for the first time of improved FADC variants for medium-chain 1-alkene production from both DNA shuffling and random mutagenesis libraries. Advantageously, this screening method can be extended to other enzymes that stoichiometrically utilize H2O2 as co-substrate. (ChemCatChem. 2020, 12, 80-84. https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/cctc.201901347)
Prof. Changning Liu from Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences was invited to give a lecture of "Long Non-coding RNA Studies - from Data Collection, Functional Prediction to Experimental Validation" at Microbial Technology Institute of Shandong University.
Prof. Yazhong Xiao from Anhui University was invited to give a lecture of "Discovery of New Amylase" at Microbial Technology Institute of Shandong University.
2019-12-06Engineering cytochrome P450 enzyme systems for biomedical and biotechnological applications
A new review from this laboratory was published on the Journal of Biological Chemistry. In this review, we focused on recent progress of different strategies, including protein engineering, redox-partner engineering, substrate engineering, electron source engineering, and P450-mediated metabolic engineering, in efforts to more efficiently produce pharmaceuticals and other chemicals. We also discussed future opportunities for engineering and applications of the P450 systems. (J. Biol. Chem. 2020, 295(3), 833-849. https://www.jbc.org/content/295/3/833.full?sid=0c2d804f-d2a3-4f53-9b71-f6f6612ea810)
2019-11-15Congratulations to Prof. Shengying Li for receiving the ICBS-2019 Young Chemical Biologist Award
Prof. Shengying Li was invited to attend The 8th Annual Conference of International Chemical Biology Society (ICBS-2019) at CSIR-IICT, Hyderabad, India during November 2-4, 2019. In this conference, Prof. Li was awarded the ICBS-2019 Young Chemical Biologist.
2019-10-31Prof. Shengying Li joined The International Advisory Committee
Prof. Shengying Li joined The International Advisory Committee for International Symposia on Cytochrome P450 (https://my.vanderbilt.edu/p450meetings/iac/)
2019-09-17Biosynthesis of fatty acid-derived hydrocarbons: Perspectives on enzymology and enzyme engineering
Enormous fuel consumption and growing environmental concerns have been spurring development of renewable biofuels. Among various biofuels, fatty acid-derived biohydrocarbons are ideal alternatives to non-renewable fossil fuels due to their closest properties to petroleum-based fuels. In the past decade, novel hydrocarbon-producing enzymes have continuously been discovered and engineered. Recently, we published a review on Current Opinion in Biotechnology about the recent advances in biosynthesis of fatty acid-derived hydrocarbons with emphasis on enzymology and enzyme engineering, based on which some outlooks are provided. (Curr. Opin. Biotechnol. 2020, 62, 7-14. https://www.sciencedirect.com/science/article/pii/S0958166919300485 )
2019-07-26The 4th Actinomycete Biology and the 2nd Microbial Drug Symposium was held in Qingdao
From July 19-22, 2019, the 4th Actinomycete Biology and the 2nd Microbial Drug Symposium was held in Qingdao. The national meeting was co-sponsored by the Molecular Microbiology and Bioengineering Professional Committee of China’s Microbiology Society, Shandong Microbiology Society, and the State Key Laboratory of Microbial Technology, Shandong University. About 400 experts, scholars and students studying actinomycete biology, microbial drugs, and synthetic biology from all over the country attended the conference. The opening ceremony of the conference was presided by Prof. Shengying Li.
2019-06-05Compartmentalized biosynthesis of mycophenolic acid
We elucidate the full biosynthetic pathway of the fungal natural product mycophenolic acid (MPA). Besides the intriguing enzymatic mechanisms, we reveal that the MPA biosynthetic enzymes are elegantly compartmentalized; the oxygenase MpaB’ is the long-sought enzyme responsible for initiating the oxidative cleavage of the farnesyl side chain; and the subcellular localization of the acyl-coenzyme A hydrolase MpaH’ in peroxisomes is required for the unique cooperation between biosynthetic and β-oxidation catabolism machineries. This work highlights the importance of a cell biology perspective for understanding the underexplored organelle-associated essential catalytic mechanisms in natural product biosynthesis of fungi and other higher organisms. The insights gained in our study will benefit future efforts for both industrial strain improvement and novel drug development. (Proc. Natl. Acad. Sci. U.S.A. 2019, 116(27), 13305-13310. https://www.pnas.org/content/116/27/13305)
2019-04-08Biochemical characterization of three new α-olefn-producing P450 fatty acid decarboxylases
2018-10-02Mechanistic insights into interactions between bacterial class I P450 enzymes and redox partners
We constituted a P450 reaction matrix network with 16 Fdxs, 8 FdRs, and 6 P450s (against 7 substrates). By analyzing the reactivity proﬁles of 896 P450 reactions, together with phylogenetic analysis, redox potential measurements, structural simulations, and Fdx-P450 molecular docking, we provide important mechanistic insights into the recognition and interactions between bacterial Class I P450 enzymes and redox partners.
(ACS Catal. 2018, 8, 9992-10003. https://pubs.acs.org/doi/10.1021/acscatal.8b02913)