1
|
Jiang S, Zhou Z, Han J, Fan Q, Long Z, Wang J. Enhanced enzyme thermostability of a family I.3 lipase LipSR1 by T118A mutation at the calcium-binding site. Biotechnol Lett 2023; 45:1199-1207. [PMID: 37439931 DOI: 10.1007/s10529-023-03413-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/24/2023] [Accepted: 06/26/2023] [Indexed: 07/14/2023]
Abstract
OBJECTIVES The lipase gene lipSR1 isolated from oil-contaminated soil exhibits high hydrolytic activity for short-chain fatty acid substrates. A single calcium ion is required to anchor the lid of LipSR1 in an open conformation by coordination with two aspartate residues and three other residues in the lid. The lid of LipSR1 is anchored by Ca2+, which is coordinated by side-chain carboxyl oxygens of Asp153 and Asp157, carbonyl oxygens of Thr118 and Ser144, and the side chain of Gln120. RESULTS D157A, D153R, Q120A, S144A, and T118A mutants were produced by site-directed mutagenesis in this study. Analyses of hydrolytic activity and thermostability showed that the properties of D157A, D153R, Q120A, and S144A were almost lost, suggesting that Asp157, Asp153, Gln120, and Ser144 are important residues for LipSR1. However, the catalytic performance of T118A was clearly maintained. Moreover, the thermostability of mutant T118A was higher than that of wild-type LipSR1. CONCLUSIONS These results indicated that mutation of threonine at position 118 improved the stability of the enzyme at high temperature.
Collapse
Affiliation(s)
- Shijie Jiang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Zhengfu Zhou
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Jiahui Han
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China
| | - Qingfeng Fan
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Zhijian Long
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China
| | - Jin Wang
- School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China.
- Biotechnology Research Institute, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
| |
Collapse
|
2
|
Assembly of the Cutin Polyester: From Cells to Extracellular Cell Walls. PLANTS 2017; 6:plants6040057. [PMID: 29156572 PMCID: PMC5750633 DOI: 10.3390/plants6040057] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 11/16/2017] [Accepted: 11/16/2017] [Indexed: 01/10/2023]
Abstract
Cuticular matrices covering aerial plant organs or delimiting compartments in these organs are composed of an insoluble hydrophobic polymer of high molecular mass, i.e., cutin, that encompass some cell wall polysaccharides and is filled by waxes. Cutin is a polyester of hydroxy and-or epoxy fatty acids including a low amount of glycerol. Screening of Arabidopsis and more recently of tomato (Solanum lycopersicum) mutants allowed the delineation of the metabolic pathway involved in the formation of cutin monomers, as well as their translocation in the apoplast. Furthermore, these studies identified an extracellular enzyme involved in the polymerization of these monomers, i.e., cutin synthase 1 (CUS1), an acyl transferase of the GDSL lipase protein family. By comparing the structure of tomato fruit cutins from wild type and down-regulated CUS1 mutants, as well as with the CUS1-catalyzed formation of oligomers in vitro, hypothetical models can be elaborated on the polymerization of cutins. The polymorphism of the GDSL-lipase family raises a number of questions concerning the function of the different isoforms in relation with the formation of a composite material, the cuticle, containing entangled hydrophilic and hydrophobic polymers, i.e., polysaccharides and cutin, and plasticizers, i.e., waxes.
Collapse
|
3
|
Murata D, Okano H, Angkawidjaja C, Akutsu M, Tanaka SI, Kitahara K, Yoshizawa T, Matsumura H, Kado Y, Mizohata E, Inoue T, Sano S, Koga Y, Kanaya S, Takano K. Structural Basis for the Serratia marcescens Lipase Secretion System: Crystal Structures of the Membrane Fusion Protein and Nucleotide-Binding Domain. Biochemistry 2017; 56:6281-6291. [PMID: 29094929 DOI: 10.1021/acs.biochem.7b00985] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Serratia marcescens secretes a lipase, LipA, through a type I secretion system (T1SS). The T1SS for LipA, the Lip system, is composed of an inner membrane ABC transporter with its nucleotide-binding domains (NBD), LipB, a membrane fusion protein, LipC, and an outer membrane channel protein, LipD. Passenger protein secreted by this system has been functionally and structurally characterized well, but relatively little information about the transporter complex is available. Here, we report the crystallographic studies of LipC without the membrane anchor region, LipC-, and the NBD of LipB (LipB-NBD). LipC- crystallographic analysis has led to the determination of the structure of the long α-helical and lipoyl domains, but not the area where it interacts with LipB, suggesting that the region is flexible without LipB. The long α-helical domain has three α-helices, which interacts with LipD in the periplasm. LipB-NBD has the common overall architecture and ATP hydrolysis activity of ABC transporter NBDs. Using the predicted models of full-length LipB and LipD, the overall structural insight into the Lip system is discussed.
Collapse
Affiliation(s)
- Daichi Murata
- Department of Biomolecular Chemistry, Kyoto Prefectural University , Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
| | - Hiroyuki Okano
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Clement Angkawidjaja
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Masato Akutsu
- Buchmann Institute for Molecular Life Sciences, Goethe University Frankfurt , Max-von-Laue-Straße, 60438 Frankfurt am Main, Germany
| | - Shun-Ichi Tanaka
- College of Life Sciences, Ritsumeikan University , Noji-Higashi, Kusatsu 525-8577, Japan
| | - Kenyu Kitahara
- Department of Biomolecular Chemistry, Kyoto Prefectural University , Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
| | - Takuya Yoshizawa
- College of Life Sciences, Ritsumeikan University , Noji-Higashi, Kusatsu 525-8577, Japan
| | - Hiroyoshi Matsumura
- College of Life Sciences, Ritsumeikan University , Noji-Higashi, Kusatsu 525-8577, Japan
| | - Yuji Kado
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Eiichi Mizohata
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Tsuyoshi Inoue
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Satoshi Sano
- Department of Biomolecular Chemistry, Kyoto Prefectural University , Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
| | - Yuichi Koga
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Shigenori Kanaya
- Graduate School of Engineering, Osaka University , Yamadaoka, Suita 565-0871, Japan
| | - Kazufumi Takano
- Department of Biomolecular Chemistry, Kyoto Prefectural University , Hangi-cho, Shimogamo, Sakyo-ku, Kyoto 606-8522, Japan
| |
Collapse
|
4
|
Protein Engineering and Homologous Expression of Serratia marcescens Lipase for Efficient Synthesis of a Pharmaceutically Relevant Chiral Epoxyester. Appl Biochem Biotechnol 2017; 183:543-554. [PMID: 28766104 DOI: 10.1007/s12010-017-2543-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 06/20/2017] [Indexed: 01/08/2023]
Abstract
The lipase isolated from Serratia marcescens (LipA) is a useful biocatalyst for kinetic resolution of a pharmaceutically relevant epoxyester, (±)-3-(4'-methoxyphenyl) glycidic acid methyl ester [(±)-MPGM], to afford optically pure (-)-MPGM, a key intermediate for the synthesis of diltiazem hydrochloride. Two mutants, LipAL315S and LipAS271F, were identified from the combinatorial saturation mutation library of 14 amino acid residues lining the substrate-binding pocket. LipAL315S, LipAS271F, and their combination LipAL315S/S271F showed 2.6-, 2.2-, and 4.6-fold improvements in their specific activities towards para-nitrophenyl butyrate (pNPB), respectively. Among these positive mutants, LipAS271F displayed a 3.5-fold higher specific activity towards the pharmaco substrate (±)-MPGM. Kinetic study showed that the improvement in catalytic efficiency of LipAS271F against (±)-MPGM was mainly resulted from the enhanced affinity between substrate and enzyme, as indicated by the decrease of K m. Furthermore, to address the insoluble expression issue in Escherichia coli, the homologous expression of LipA gene in S. marcescens was achieved by introducing it into an expression vector pUC18, resulting in ca. 20-fold higher lipase production. The significantly improved volumeric production and specific activity of S. marcescens lipase make it very attractive as a new-generation biocatalyst for more efficient and economical manufacturing of (-)-MPGM.
Collapse
|