1
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Wang G, Chen X, Yu C, Shi X, Lan W, Gao C, Yang J, Dai H, Zhang X, Zhang H, Zhao B, Xie Q, Yu N, He Z, Zhang Y, Wang E. Release of a ubiquitin brake activates OsCERK1-triggered immunity in rice. Nature 2024; 629:1158-1164. [PMID: 38750355 DOI: 10.1038/s41586-024-07418-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2022] [Accepted: 04/12/2024] [Indexed: 05/31/2024]
Abstract
Plant pattern-recognition receptors perceive microorganism-associated molecular patterns to activate immune signalling1,2. Activation of the pattern-recognition receptor kinase CERK1 is essential for immunity, but tight inhibition of receptor kinases in the absence of pathogen is crucial to prevent autoimmunity3,4. Here we find that the U-box ubiquitin E3 ligase OsCIE1 acts as a molecular brake to inhibit OsCERK1 in rice. During homeostasis, OsCIE1 ubiquitinates OsCERK1, reducing its kinase activity. In the presence of the microorganism-associated molecular pattern chitin, active OsCERK1 phosphorylates OsCIE1 and blocks its E3 ligase activity, thus releasing the brake and promoting immunity. Phosphorylation of a serine within the U-box of OsCIE1 prevents its interaction with E2 ubiquitin-conjugating enzymes and serves as a phosphorylation switch. This phosphorylation site is conserved in E3 ligases from plants to animals. Our work identifies a ligand-released brake that enables dynamic immune regulation.
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Affiliation(s)
- Gang Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
| | - Xi Chen
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Chengzhi Yu
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Xiaobao Shi
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Wenxian Lan
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
| | - Chaofeng Gao
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
- University of the Chinese Academy of Sciences, Beijing, China
| | - Jun Yang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
| | - Huiling Dai
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
| | - Xiaowei Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China
- The New Cornerstone Science Laboratory, Shenzhen, China
| | - Huili Zhang
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou, China
| | - Boyu Zhao
- The New Cornerstone Science Laboratory, Shenzhen, China
- School of Life Science, Shanghai Normal University, Shanghai, China
| | - Qi Xie
- Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China
| | - Nan Yu
- School of Life Science, Shanghai Normal University, Shanghai, China
| | - Zuhua He
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
- School of Life Science and Technology, Shanghai Tech University, Shanghai, China.
| | - Yu Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
| | - Ertao Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Chinese Academy of Sciences, Shanghai, China.
- The New Cornerstone Science Laboratory, Shenzhen, China.
- School of Life Science and Technology, Shanghai Tech University, Shanghai, China.
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2
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Kumar R, R R, Diwakar V, Khan N, Kumar Meghwanshi G, Garg P. Structural-functional analysis of drug target aspartate semialdehyde dehydrogenase. Drug Discov Today 2024; 29:103908. [PMID: 38301800 DOI: 10.1016/j.drudis.2024.103908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Revised: 01/17/2024] [Accepted: 01/25/2024] [Indexed: 02/03/2024]
Abstract
Aspartate β-semialdehyde dehydrogenase (ASADH) is a key enzyme in the biosynthesis of essential amino acids in microorganisms and some plants. Inhibition of ASADHs can be a potential drug target for developing novel antimicrobial and herbicidal compounds. This review covers up-to-date information about sequence diversity, ligand/inhibitor-bound 3D structures, potential inhibitors, and key pharmacophoric features of ASADH useful in designing novel and target-specific inhibitors of ASADH. Most reported ASADH inhibitors have two highly electronegative functional groups that interact with two key arginyl residues present in the active site of ASADHs. The structural information, active site binding modes, and key interactions between the enzyme and inhibitors serve as the basis for designing new and potent inhibitors against the ASADH family.
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Affiliation(s)
- Rajender Kumar
- Division of Glycoscience, Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 106 91 Stockholm, Sweden
| | - Rajkumar R
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar 160062, Punjab, India
| | - Vineet Diwakar
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar 160062, Punjab, India
| | - Nazam Khan
- Clinical Laboratory Science Department, Applied Medical Science College, Shaqra University, Shaqra, Kingdom of Saudi Arabia
| | | | - Prabha Garg
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar 160062, Punjab, India.
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3
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Pines G, Pines A, Eckert CA. Highly Efficient Libraries Design for Saturation Mutagenesis. Synth Biol (Oxf) 2022; 7:ysac006. [PMID: 35734540 PMCID: PMC9205323 DOI: 10.1093/synbio/ysac006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 04/24/2022] [Accepted: 05/11/2022] [Indexed: 11/30/2022] Open
Abstract
Saturation mutagenesis is a semi-rational approach for protein engineering where sites are saturated either entirely or partially to include amino acids of interest. We previously reported on a codon compression algorithm, where a set of minimal degenerate codons are selected according to user-defined parameters such as the target organism, type of saturation and usage levels. Here, we communicate an addition to our web tool that considers the distance between the wild-type codon and the library, depending on its purpose. These forms of restricted collections further reduce library size, lowering downstream screening efforts or, in turn, allowing more comprehensive saturation of multiple sites. The library design tool can be accessed via http://www.dynamcc.com/dynamcc_d/.
Graphical Abstract
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Affiliation(s)
- Gur Pines
- Department of Entomology, Institute of Plant Protection, Agricultural Research Organization, Rishon LeTsiyon, 7528809, Israel
| | | | - Carrie A Eckert
- Biosciences Division, Oak Ridge National Laboratory, P.O. Box 2008, MS6060, Oak Ridge, Tennessee, 37831, USA
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4
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Xu X, Chemparathy A, Zeng L, Kempton HR, Shang S, Nakamura M, Qi LS. Engineered miniature CRISPR-Cas system for mammalian genome regulation and editing. Mol Cell 2021; 81:4333-4345.e4. [PMID: 34480847 DOI: 10.1016/j.molcel.2021.08.008] [Citation(s) in RCA: 155] [Impact Index Per Article: 51.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 06/29/2021] [Accepted: 08/05/2021] [Indexed: 12/17/2022]
Abstract
Compact and versatile CRISPR-Cas systems will enable genome engineering applications through high-efficiency delivery in a wide variety of contexts. Here, we create an efficient miniature Cas system (CasMINI) engineered from the type V-F Cas12f (Cas14) system by guide RNA and protein engineering, which is less than half the size of currently used CRISPR systems (Cas9 or Cas12a). We demonstrate that CasMINI can drive high levels of gene activation (up to thousands-fold increases), while the natural Cas12f system fails to function in mammalian cells. We show that the CasMINI system has comparable activities to Cas12a for gene activation, is highly specific, and allows robust base editing and gene editing. We expect that CasMINI can be broadly useful for cell engineering and gene therapy applications ex vivo and in vivo.
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Affiliation(s)
- Xiaoshu Xu
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | | | - Leiping Zeng
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Hannah R Kempton
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Stephen Shang
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Muneaki Nakamura
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA
| | - Lei S Qi
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA; Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA; ChEM-H, Stanford University, Stanford, CA 94305, USA.
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5
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Du H, Zhao Y, Wu F, Ouyang P, Chen J, Jiang X, Ye J, Chen GQ. Engineering Halomonas bluephagenesis for L-Threonine production. Metab Eng 2020; 60:119-127. [PMID: 32315761 DOI: 10.1016/j.ymben.2020.04.004] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 04/06/2020] [Accepted: 04/13/2020] [Indexed: 12/13/2022]
Abstract
Halophilic Halomonas bluephagenesis (H. bluephagenesis), a chassis for cost-effective Next Generation Industrial Biotechnology (NGIB), was for the first time engineered to successfully produce L-threonine, one of the aspartic family amino acids (AFAAs). Five exogenous genes including thrA*BC, lysC* and rhtC encoding homoserine dehydrogenase mutant at G433R, homoserine kinase, L-threonine synthase, aspartokinase mutant at T344M, S345L and T352I, and export transporter of threonine, respectively, were grouped into two expression modules for transcriptional tuning on plasmid- and chromosome-based systems in H. bluephagenesis, respectively, after pathway tuning debugging. Combined with deletion of import transporter or/and L-threonine dehydrogenase encoded by sstT or/and thd, respectively, the resulting recombinant H. bluephagenesis TDHR3-42-p226 produced 7.5 g/L and 33 g/L L-threonine when grown under open unsterile conditions in shake flasks and in a 7 L bioreactor, respectively. Engineering H. bluephagenesis demonstrates strong potential for production of diverse metabolic chemicals.
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Affiliation(s)
- Hetong Du
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Yiqing Zhao
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Fuqing Wu
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Peifei Ouyang
- China Fortune Land Development Industrial Investment Co. Ltd., Beijing, 100027, China; Research Center for Healthcare Management, School of Economics and Management, Tsinghua University, China
| | - Jinchun Chen
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China
| | - Xiaoran Jiang
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China.
| | - Jianwen Ye
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China.
| | - Guo-Qiang Chen
- Center for Synthetic and Systems Biology, Tsinghua University, Beijing, 100084, China; Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Bioinformatics, Center for Nano and Micro Mechanics, Tsinghua University, Beijing, 100084, China; MOE Key Lab of Industrial Biocatalysis, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China.
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6
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Qu G, Li A, Acevedo‐Rocha CG, Sun Z, Reetz MT. Die zentrale Rolle der Methodenentwicklung in der gerichteten Evolution selektiver Enzyme. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201901491] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Aitao Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei Collaborative Innovation Center for Green Transformation of Bio-resources Hubei Key Laboratory of Industrial Biotechnology College of Life Sciences Hubei University 368 Youyi Road Wuchang Wuhan 430062 China
| | | | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Manfred T. Reetz
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim Deutschland
- Department of Chemistry, Hans-Meerwein-Straße 4 Philipps-Universität 35032 Marburg Deutschland
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7
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Qu G, Li A, Acevedo‐Rocha CG, Sun Z, Reetz MT. The Crucial Role of Methodology Development in Directed Evolution of Selective Enzymes. Angew Chem Int Ed Engl 2020; 59:13204-13231. [PMID: 31267627 DOI: 10.1002/anie.201901491] [Citation(s) in RCA: 238] [Impact Index Per Article: 59.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Indexed: 12/14/2022]
Affiliation(s)
- Ge Qu
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Aitao Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering Hubei Collaborative Innovation Center for Green Transformation of Bio-resources Hubei Key Laboratory of Industrial Biotechnology College of Life Sciences Hubei University 368 Youyi Road Wuchang Wuhan 430062 China
| | | | - Zhoutong Sun
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
| | - Manfred T. Reetz
- Tianjin Institute of Industrial Biotechnology Chinese Academy of Sciences 32 West 7th Avenue, Tianjin Airport Economic Area Tianjin 300308 China
- Max-Planck-Institut für Kohlenforschung Kaiser-Wilhelm-Platz 1 45470 Mülheim Germany
- Department of Chemistry, Hans-Meerwein-Strasse 4 Philipps-University 35032 Marburg Germany
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8
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Tonin F, Otten LG, Arends IWCE. NAD + -Dependent Enzymatic Route for the Epimerization of Hydroxysteroids. CHEMSUSCHEM 2019; 12:3192-3203. [PMID: 30265441 PMCID: PMC6681466 DOI: 10.1002/cssc.201801862] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 09/28/2018] [Indexed: 05/12/2023]
Abstract
Epimerization of cholic and chenodeoxycholic acid (CA and CDCA, respectively) is a notable conversion for the production of ursodeoxycholic acid (UDCA). Two enantiocomplementary hydroxysteroid dehydrogenases (7α- and 7β-HSDHs) can carry out this transformation fully selectively by specific oxidation of the 7α-OH group of the substrate and subsequent reduction of the keto intermediate to the final product (7β-OH). With a view to developing robust and active biocatalysts, novel NADH-active 7β-HSDH species are necessary to enable a solely NAD+ -dependent redox-neutral cascade for UDCA production. A wild-type NADH-dependent 7β-HSDH from Lactobacillus spicheri (Ls7β-HSDH) was identified, recombinantly expressed, purified, and biochemically characterized. Using this novel NAD+ -dependent 7β-HSDH enzyme in combination with 7α-HSDH from Stenotrophomonas maltophilia permitted the biotransformations of CA and CDCA in the presence of catalytic amounts of NAD+ , resulting in high yields (>90 %) of UCA and UDCA.
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Affiliation(s)
- Fabio Tonin
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Linda G. Otten
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Isabel W. C. E. Arends
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
- Present address: Faculty of ScienceUtrecht UniversityBudapestlaan 63584 CDUtrechtThe Netherlands
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9
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Wu W, Zhang Y, Liu D, Chen Z. Efficient mining of natural NADH-utilizing dehydrogenases enables systematic cofactor engineering of lysine synthesis pathway of Corynebacterium glutamicum. Metab Eng 2018; 52:77-86. [PMID: 30458240 DOI: 10.1016/j.ymben.2018.11.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Revised: 10/22/2018] [Accepted: 11/16/2018] [Indexed: 12/01/2022]
Abstract
Increasing the availability of NADPH is commonly used to improve lysine production by Corynebacterium glutamicum since 4 mol of NADPH are required for the synthesis of 1 mol of lysine. Alternatively, engineering of enzymes in lysine synthesis pathway to utilize NADH directly can also be explored for cofactor balance during lysine overproduction. To achieve such a goal, enzyme mining was used in this study to quickly identify a full set of NADH-utilizing dehydrogenases, namely aspartate dehydrogenase from Pseudomonas aeruginosa (PaASPDH), aspartate-semialdehyde dehydrogenase from Tistrella mobilis (TmASADH), dihydrodipicolinate reductase from Escherichia coli (EcDHDPR), and diaminopimelate dehydrogenase from Pseudothermotoga thermarum (PtDAPDH). This allowed us to systematically perturb cofactor utilization of lysine synthesis pathway of C. glutamicum for the first time. Individual overexpression of PaASPDH, TmASADH, EcDHDPR, and PtDAPDH in C. glutamicum LC298, a basic lysine producer, increased the production of lysine by 30.7%, 32.4%, 17.4%, and 36.8%, respectively. Combinatorial replacement of NADPH-dependent dehydrogenases in C. glutamicum ATCC 21543, a lysine hyperproducer, also resulted in significantly improved lysine production. The highest increase of lysine production (30.7%) was observed for a triple-mutant strain (27.7 g/L, 0.35 g/g glucose) expressing PaASPDH, TmASADH, and EcDHDPR. A quadruple-mutant strain expressing all of the four NADH-utilizing enzymes allowed high lysine production (24.1 g/L, 0.30 g/g glucose) almost independent of the oxidative pentose phosphate pathway. Collectively, our results demonstrated that a combination of enzyme mining and cofactor engineering was a highly efficient approach to improve lysine production. Similar strategies can be applied for the production of other amino acids or their derivatives.
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Affiliation(s)
- Wenjun Wu
- Key Laboratory of Industrial Biocatalysis (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Ye Zhang
- Key Laboratory of Industrial Biocatalysis (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Dehua Liu
- Key Laboratory of Industrial Biocatalysis (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China
| | - Zhen Chen
- Key Laboratory of Industrial Biocatalysis (Ministry of Education), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China; Tsinghua Innovation Center in Dongguan, Dongguan 523808, China; Center for Synthetic and Systems Biology, Tsinghua University, Beijing 100084, China.
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10
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Mank NJ, Pote S, Majorek K, Arnette AK, Klapper VG, Hurlburt BK, Chruszcz M. Structure of aspartate β-semialdehyde dehydrogenase from Francisella tularensis. Acta Crystallogr F Struct Biol Commun 2018; 74:14-22. [PMID: 29372903 PMCID: PMC5947688 DOI: 10.1107/s2053230x17017241] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 12/01/2017] [Indexed: 11/10/2022] Open
Abstract
Aspartate β-semialdehyde dehydrogenase (ASADH) is an enzyme involved in the diaminopimelate pathway of lysine biosynthesis. It is essential for the viability of many pathogenic bacteria and therefore has been the subject of considerable research for the generation of novel antibiotic compounds. This manuscript describes the first structure of ASADH from Francisella tularensis, the causative agent of tularemia and a potential bioterrorism agent. The structure was determined at 2.45 Å resolution and has a similar biological assembly to other bacterial homologs. ASADH is known to be dimeric in bacteria and have extensive interchain contacts, which are thought to create a half-sites reactivity enzyme. ASADH from higher organisms shows a tetrameric oligomerization, which also has implications for both reactivity and regulation. This work analyzes the apo form of F. tularensis ASADH, as well as the binding of the enzyme to its cofactor NADP+.
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Affiliation(s)
- N. J. Mank
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
| | - S. Pote
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
| | - K.A. Majorek
- Department of Molecular Physiology and Biological Physics, University of Virginia, PO Box 800736, Charlottesville, VA 22908, USA
| | - A. K. Arnette
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
| | - V. G. Klapper
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
| | - B. K. Hurlburt
- Agricultural Research Service, Southern Regional Research Center, US Department of Agriculture, 1100 Robert E. Lee Boulevard, New Orleans, LA 70124, USA
| | - M. Chruszcz
- Department of Chemistry and Biochemistry, University of South Carolina, 631 Sumter Street, Columbia, SC 29208, USA
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11
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Abstract
Saturation mutagenesis is conveniently located between the two extremes of protein engineering, namely random mutagenesis, and rational design. It involves mutating a confined number of target residues to other amino acids, and hence requires knowledge regarding the sites for mutagenesis, but not their final identity. There are many different strategies for performing and designing such experiments, ranging from simple single degenerate codons to codon collections that code for distinct sets of amino acids. Here, we provide detailed information on the Dynamic Management for Codon Compression (DYNAMCC) approaches that allow us to precisely define the desired amino acid composition to be introduced to a specific target site. DYNAMCC allows us to set usage thresholds and to eliminate undesirable stop and wild-type codons, thus allowing us to control library size and subsequently downstream screening efforts. The DYNAMCC algorithms are free of charge and are implemented in a website for easy access and usage: www.dynamcc.com .
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Affiliation(s)
- Gur Pines
- Renewable and Sustainable Energy Institute (RASEI), University of Colorado Boulder, Boulder, CO, USA. .,Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA.
| | - Ryan T Gill
- Renewable and Sustainable Energy Institute (RASEI), University of Colorado Boulder, Boulder, CO, USA.,Department of Chemical and Biological Engineering, University of Colorado Boulder, Boulder, CO, USA
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12
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Abstract
The standard genetic code is robust to mutations during transcription and translation. Point mutations are likely to be synonymous or to preserve the chemical properties of the original amino acid. Saturation mutagenesis experiments suggest that in some cases the best-performing mutant requires replacement of more than a single nucleotide within a codon. These replacements are essentially inaccessible to common error-based laboratory engineering techniques that alter a single nucleotide per mutation event, due to the extreme rarity of adjacent mutations. In this theoretical study, we suggest a radical reordering of the genetic code that maximizes the mutagenic potential of single nucleotide replacements. We explore several possible genetic codes that allow a greater degree of accessibility to the mutational landscape and may result in a hyperevolvable organism that could serve as an ideal platform for directed evolution experiments. We then conclude by evaluating the challenges of constructing such recoded organisms and their potential applications within the field of synthetic biology. The conservative nature of the genetic code prevents bioengineers from efficiently accessing the full mutational landscape of a gene via common error-prone methods. Here, we present two computational approaches to generate alternative genetic codes with increased accessibility. These new codes allow mutational transitions to a larger pool of amino acids and with a greater extent of chemical differences, based on a single nucleotide replacement within the codon, thus increasing evolvability both at the single-gene and at the genome levels. Given the widespread use of these techniques for strain and protein improvement, along with more fundamental evolutionary biology questions, the use of recoded organisms that maximize evolvability should significantly improve the efficiency of directed evolution, library generation, and fitness maximization.
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13
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Xu X, Wang C, Chen J, Yang S. Streptomyces virginiae PPDC Is a New Type of Phenylpyruvate Decarboxylase Composed of Two Subunits. ACS Chem Biol 2017; 12:2008-2014. [PMID: 28719183 DOI: 10.1021/acschembio.7b00307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Streptomyces virginiae phenylpyruvate decarboxylase (PPDC) has not been identified before. Two putative branched-chain α-keto acid dehydrogenase subunit genes bkdC and bkdD from S. virginiae are similar to halves of other PPDC coding sequences. We cloned and characterized them biochemically in this work. The two proteins formed a stable complex attested by pull-down assay, consistent with the finding that their soluble expression was obtained only when they were coexpressed in Escherichia coli. The subunits were redesignated as SvPPDCα and SvPPDCβ, because the SvPPDCα/β complex catalyzed the conversion of phenylpyruvate to phenylacetaldehyde, reflecting the nature of the enzyme. Moreover, mutations of conserved residues in either of the two subunits led to inactivation or decreased specific activity of the enzymatic reaction. All previously identified PPDCs are encoded by a single gene. Here, we identified a new type of PPDC that contains two subunits, which gives new insights into the PPDC family.
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Affiliation(s)
- Xiaoshu Xu
- University of Chinese Academy of Sciences, Beijing 100049, China
| | | | | | - Sheng Yang
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing 210009, China
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Wang C, Wang G, Zhang C, Zhu P, Dai H, Yu N, He Z, Xu L, Wang E. OsCERK1-Mediated Chitin Perception and Immune Signaling Requires Receptor-like Cytoplasmic Kinase 185 to Activate an MAPK Cascade in Rice. MOLECULAR PLANT 2017; 10:619-633. [PMID: 28111288 DOI: 10.1016/j.molp.2017.01.006] [Citation(s) in RCA: 106] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 01/02/2017] [Accepted: 01/10/2017] [Indexed: 05/06/2023]
Abstract
Conserved pathogen-associated molecular patterns (PAMPs), such as chitin, are perceived by pattern recognition receptors (PRRs) located at the host cell surface and trigger rapid activation of mitogen-activated protein kinase (MAPK) cascades, which are required for plant resistance to pathogens. However, the direct links from PAMP perception to MAPK activation in plants remain largely unknown. In this study, we found that the PRR-associated receptor-like cytoplasmic kinase Oryza sativa RLCK185 transmits immune signaling from the PAMP receptor OsCERK1 to an MAPK signaling cascade through interaction with an MAPK kinase kinase, OsMAPKKKε, which is the initial kinase of the MAPK cascade. OsRLCK185 interacts with and phosphorylates the C-terminal regulatory domain of OsMAPKKKε. Coexpression of phosphomimetic OsRLCK185 and OsMAPKKKε activates MAPK3/6 phosphorylation in Nicotiana benthamiana leaves. Moreover, OsMAPKKKε interacts with and phosphorylates OsMKK4, a key MAPK kinase that transduces the chitin signal. Overexpression of OsMAPKKKε increases chitin-induced MAPK3/6 activation, whereas OsMAPKKKε knockdown compromises chitin-induced MAPK3/6 activation and resistance to rice blast fungus. Taken together, our results suggest the existence of a phospho-signaling pathway from cell surface chitin perception to intracellular activation of an MAPK cascade in rice.
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Affiliation(s)
- Chao Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Gang Wang
- Department of Biology, East China Normal University, Shanghai 200241, China; National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Chi Zhang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Pinkuan Zhu
- Department of Biology, East China Normal University, Shanghai 200241, China
| | - Huiling Dai
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Nan Yu
- College of Life and Environment Sciences, Shanghai Normal University, Shanghai 200234, China
| | - Zuhua He
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China
| | - Ling Xu
- Department of Biology, East China Normal University, Shanghai 200241, China.
| | - Ertao Wang
- National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Institute of Plant Physiology and Ecology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
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