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Liu HW, Wang LL, Meng Z, Tang X, Li YS, Xia QY, Zhao P. A clip domain serine protease involved in moulting in the silkworm, Bombyx mori: cloning, characterization, expression patterns and functional analysis. INSECT MOLECULAR BIOLOGY 2017; 26:507-521. [PMID: 28597953 DOI: 10.1111/imb.12312] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Clip domain serine proteases (CLIPs), characterized by one or more conserved clip domains, are essential components of extracellular signalling cascades in various biological processes, especially in innate immunity and the embryonic development of insects. Additionally, CLIPs may have additional non-immune functions in insect development. In the present study, the clip domain serine protease gene Bombyx mori serine protease 95 (BmSP95), which encodes a 527-residue protein, was cloned from the integument of B. mori. Bioinformatics analysis indicated that BmSP95 is a typical CLIP of the subfamily D and possesses a clip domain at the N terminus, a trypsin-like serine protease (tryp_spc) domain at the C terminus and a conserved proline-rich motif between these two domains. At the transcriptional level, BmSP95 is expressed in the integument during moulting and metamorphosis, and the expression pattern is consistent with the fluctuating 20-hydroxyecdysone (20E) titre in B. mori. At the translational level, BmSP95 protein is synthesized in the epidermal cells, secreted as a zymogen and activated in the moulting fluid. Immunofluorescence revealed that BmSP95 is distributed into the old endocuticle in the moulting stage. The expression of BmSP95 was upregulated by 20E. Moreover, expression of BmSP95 was downregulated by pathogen infection. RNA interference-mediated silencing of BmSP95 led to delayed moulting from pupa to moth. These results suggest that BmSP95 is involved in integument remodelling during moulting and metamorphosis.
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Affiliation(s)
- H-W Liu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - L-L Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Z Meng
- College of Biotechnology, Southwest University, Chongqing, China
| | - X Tang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - Y-S Li
- Vitamin D Research Institute, Shaanxi University of Technology, Hanzhong, Shaanxi, China
| | - Q-Y Xia
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
| | - P Zhao
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing, China
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Post-embryonic changes in the hindgut of honeybee Apis mellifera workers: Morphology, cuticle deposition, apoptosis, and cell proliferation. Dev Biol 2017; 431:194-204. [PMID: 28939335 DOI: 10.1016/j.ydbio.2017.09.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 09/04/2017] [Accepted: 09/17/2017] [Indexed: 12/13/2022]
Abstract
In insects, the hindgut is a homeostatic region of the digestive tract, divided into pylorus, ileum, and rectum, that reabsorbs water, ions, and small molecules produced during hemolymph filtration. The hindgut anatomy in bee larvae is different from that of adult workers. This study reports the morphological changes and cellular events that occur in the hindgut during the metamorphosis of the honeybee Apis mellifera. We describe the occurrence of autophagosomes and the ultrastructure of the epithelial cells and cuticle, suggesting that cuticular degradation begins in prepupae, with the cuticle being reabsorbed and recycled by autophagosomes in white- and pink-eyed pupae, followed by the deposition of new cuticle in light-brown-eyed pupae. In L5S larvae and prepupae, the hindgut undergoes cell proliferation in the anterior and posterior ends. In the pupae, the pylorus, ileum, and rectum regions are differentiated, and cell proliferation ceases in dark-brown-eyed pupae. Apoptosis occurs in the hindgut from the L5S larval to the pink-eyed pupal stage. In light-brown- and dark-brown-eyed pupae, the ileum epithelium changes from pseudostratified to simple only after the production of the basal lamina, whereas the rectal epithelium is always flattened. In black-eyed pupae, ileum epithelial cells have large vacuoles and subcuticular spaces, while in adult forager workers these cells have long invaginations in the cell apex and many mitochondria, indicating a role in the transport of compounds. Our findings show that hindgut morphogenesis is a dynamic process, with tissue remodeling and cellular events taking place for the formation of different regions of the organ, the reconstruction of a new cuticle, and the remodeling of visceral muscles.
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Qu M, Ren Y, Liu Y, Yang Q. Studies on the chitin/chitosan binding properties of six cuticular proteins analogous to peritrophin 3 from Bombyx mori. INSECT MOLECULAR BIOLOGY 2017; 26:432-439. [PMID: 28432772 DOI: 10.1111/imb.12308] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Chitin deacetylation is required to make the cuticle rigid and compact through chitin chain crosslinking. Thus it is presumed that specialized proteins are required to bind deacetylated chitin chains together. However, deacetylated-chitin binding proteins have not ever been reported. In a previous work, six cuticular proteins analogous to peritrophin 3 (CPAP3s) were found to be abundant in the moulting fluid of Bombyx mori. In this study, these BmCPAP3s (BmCPAP3-A1, BmCPAP3-A2, BmCPAP3-B, BmCPAP3-C, BmCPAP3-D1 and BmCPAP3-D2) were cloned and expressed in Escherichia coli and purified using metal-chelating affinity chromatography. Their binding activities demonstrated that although all of the BmCPAP3s showed similar binding abilities toward crystalline chitin and colloidal chitin, they differed in their affinities toward partially and fully deacetylated chitin. Amongst them, BmCPAP3-D1 exhibited the highest binding activity toward deacetylated chitin. The gene expression pattern of BmCPAP3-D1 was similar to BmCPAP3-A1 and BmCPAP3-C at most stages except that it was dramatically upregulated at the beginning of the pupa to adult transition stage. This work is the first report of a chitin-binding protein, BmCPAP3-D1, which exhibits high binding affinity to deacetylated chitin.
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Affiliation(s)
- M Qu
- State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| | - Y Ren
- State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| | - Y Liu
- State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
| | - Q Yang
- State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology, Dalian University of Technology, Dalian, China
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, China
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54
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Brummett LM, Kanost MR, Gorman MJ. The immune properties of Manduca sexta transferrin. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2017; 81:1-9. [PMID: 27986638 PMCID: PMC5292288 DOI: 10.1016/j.ibmb.2016.12.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 12/06/2016] [Accepted: 12/12/2016] [Indexed: 05/20/2023]
Abstract
Transferrins are secreted proteins that bind iron. The well-studied transferrins are mammalian serum transferrin, which is involved in iron transport, and mammalian lactoferrin, which functions as an immune protein. Lactoferrin and lactoferrin-derived peptides have bactericidal activity, and the iron-free form of lactoferrin has bacteriostatic activity due to its ability to sequester iron. Insect transferrin is similar in sequence to both serum transferrin and lactoferrin, and its functions are not well-characterized; however, many studies of insect transferrin indicate that it has some type of immune function. The goal of this study was to determine the specific immune functions of transferrin from Manduca sexta (tobacco hornworm). We verified that transferrin expression is upregulated in response to infection in M. sexta larvae and determined that the concentration of transferrin in hemolymph increases from 2 μM to 10 μM following an immune challenge. It is also present in molting fluid and prepupal midgut fluid, two extracellular fluids with immune capabilities. No immune-induced proteolytic cleavage of transferrin in hemolymph was observed; therefore, M. sexta transferrin does not appear to be a source of antimicrobial peptides. Unlike iron-saturated lactoferrin, iron-saturated transferrin had no detectable antibacterial activity. In contrast, 1 μM iron-free transferrin inhibited bacterial growth, and this inhibition was blocked by supplementing the culture medium with 1 μM iron. Our results suggest that M. sexta transferrin does not have bactericidal activity, but that it does have a bacteriostatic function that depends on its iron sequestering ability. This study supports the hypothesis that insect transferrin participates in an iron withholding strategy to protect insects from infectious bacteria.
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Affiliation(s)
- Lisa M Brummett
- Department of Biochemistry and Molecular Biophysics, 141 Chalmers, 1711 Claflin Road, Kansas State University, Manhattan, KS 66506, USA.
| | - Michael R Kanost
- Department of Biochemistry and Molecular Biophysics, 141 Chalmers, 1711 Claflin Road, Kansas State University, Manhattan, KS 66506, USA.
| | - Maureen J Gorman
- Department of Biochemistry and Molecular Biophysics, 141 Chalmers, 1711 Claflin Road, Kansas State University, Manhattan, KS 66506, USA.
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55
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Liu T, Chen L, Zhou Y, Jiang X, Duan Y, Yang Q. Structure, Catalysis, and Inhibition of OfChi-h, the Lepidoptera-exclusive Insect Chitinase. J Biol Chem 2017; 292:2080-2088. [PMID: 28053084 DOI: 10.1074/jbc.m116.755330] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 11/28/2016] [Indexed: 12/31/2022] Open
Abstract
Chitinase-h (Chi-h) is of special interest among insect chitinases due to its exclusive distribution in lepidopteran insects and high sequence identity with bacterial and baculovirus homologs. Here OfChi-h, a Chi-h from Ostrinia furnacalis, was investigated. Crystal structures of both OfChi-h and its complex with chitoheptaose ((GlcN)7) reveal that OfChi-h possesses a long and asymmetric substrate binding cleft, which is a typical characteristics of a processive exo-chitinase. The structural comparison between OfChi-h and its bacterial homolog SmChiA uncovered two phenylalanine-to-tryptophan site variants in OfChi-h at subsites +2 and possibly -7. The F232W/F396W double mutant endowed SmChiA with higher hydrolytic activities toward insoluble substrates, such as insect cuticle, α-chitin, and chitin nanowhisker. An enzymatic assay demonstrated that OfChi-h outperformed OfChtI, an insect endo-chitinase, toward the insoluble substrates, but showed lower activity toward the soluble substrate ethylene glycol chitin. Furthermore, OfChi-h was found to be inhibited by N,N',N″-trimethylglucosamine-N,N',N″,N″'-tetraacetylchitotetraose (TMG-(GlcNAc)4), a substrate analog which can be degraded into TMG-(GlcNAc)1-2 Injection of TMG-(GlcNAc)4 into 5th-instar O. furnacalis larvae led to severe defects in pupation. This work provides insights into a molting-indispensable insect chitinase that is phylogenetically closer to bacterial chitinases than insect chitinases.
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Affiliation(s)
- Tian Liu
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and
| | - Lei Chen
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and
| | - Yong Zhou
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and
| | - Xi Jiang
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and
| | - Yanwei Duan
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and
| | - Qing Yang
- From the State Key Laboratory of Fine Chemical Engineering, School of Life Science and Biotechnology and School of Software, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China and .,Institute of Plant Protection, Chinese Academy of Agricultural Sciences, 2 West Yuanmingyuan Road, Beijing 100193, China
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56
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Zhu W, Wang D, Liu T, Yang Q. Production of N-Acetyl-d-glucosamine from Mycelial Waste by a Combination of Bacterial Chitinases and an Insect N-Acetyl-d-glucosaminidase. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:6738-6744. [PMID: 27546481 DOI: 10.1021/acs.jafc.6b03713] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
N-Acetyl-d-glucosamine (GlcNAc) has great potential to be used as a food additive and medicine. The enzymatic degradation of chitin-containing biomass for producing GlcNAc is an eco-friendly approach but suffers from a high cost. The economical efficiency can be improved by both optimizing the member and ratio of the chitinolytic enzymes and using new inexpensive substrates. To address this, a novel combination of bacterial and insect chitinolytic enzymes was developed in this study to efficiently produce GlcNAc from the mycelia of Asperillus niger, a fermentation waste. This enzyme combination contained three bacterial chitinases (chitinase A from Serratia marcescens (SmChiA), SmChiB, SmChiC) and one insect N-acetyl-d-glucosaminidase from Ostrinia furnacalis (OfHex1) in a ratio of 39.1% of SmChiA, 26.7% of SmChiB, 32.9% of SmChiC, and 1.3% of OfHex1. A yield of 6.3 mM (1.4 mg/mL) GlcNAc with a purity of 95% can be obtained from 10 mg/mL mycelial powder in 24 h. The enzyme combination reported here exhibited 5.8-fold higher hydrolytic activity over the commercial chitinase preparation derived from Streptomyces griseus.
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Affiliation(s)
- Weixing Zhu
- State Key Laboratory of Fine Chemical Engineering and School of Life Science and Biotechnology, Dalian University of Technology , Dalian 116024, China
| | - Di Wang
- State Key Laboratory of Fine Chemical Engineering and School of Life Science and Biotechnology, Dalian University of Technology , Dalian 116024, China
| | - Tian Liu
- State Key Laboratory of Fine Chemical Engineering and School of Life Science and Biotechnology, Dalian University of Technology , Dalian 116024, China
| | - Qing Yang
- State Key Laboratory of Fine Chemical Engineering and School of Life Science and Biotechnology, Dalian University of Technology , Dalian 116024, China
- Institute of Plant Protection, Chinese Academy of Agricultural Sciences , Beijing 100193, China
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57
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Hu W, Liu C, Cheng T, Li W, Wang N, Xia Q. Histomorphometric and transcriptomic features characterize silk glands' development during the molt to intermolt transition process in silkworm. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2016; 76:95-108. [PMID: 27395780 DOI: 10.1016/j.ibmb.2016.07.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Revised: 06/20/2016] [Accepted: 07/05/2016] [Indexed: 06/06/2023]
Abstract
The molt-intermolt cycle is an essential feature in holometabolous and hemimetabolous insects' development. In the silkworm, silk glands are under dramatic morphological and functional changes with fibroin genes' transcription being repeatedly turned off and on during the molt-intermolt cycles. However, the molecular mechanisms controlling it are still unknown. Here, silk gland's histomorphology and transcriptome analysis were used to characterize changes in its structure and gene expression patterns from molt to intermolt stages. By using section staining and transmission electron microscope, a renewable cell damage was detected in the silk gland at the molt stage, and an increased number of autophagosomes and lysosomes were found in silk gland cells' cytoplasm. Next, by using RNA sequencing, 54,578,413 reads were obtained, of which 85% were mapped to the silkworm reference genome. The expression level analysis of silk protein genes and silk gland transcription factors revealed that fibroin heavy chain, fibroin light chain, P25/fhx, sericin1, sericin3 and Dimm had consistent alteration trends in temporal expression. In addition, differentially expressed genes (DEGs) were identified, and most of the DEGs associated with ecdysone signal transduction, mRNA degradation, protein proteolysis, and autophagy were significantly down-regulated in the transition from molt to intermolt, suggesting that these pathways were activated for the silk gland renewal. These findings provide insights into the molecular mechanisms of silk gland development and silk protein genes transcriptional regulation during the molt to intermolt transition process.
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Affiliation(s)
- Wenbo Hu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
| | - Chun Liu
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China; Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China
| | - Tingcai Cheng
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
| | - Wei Li
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
| | - Niannian Wang
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China
| | - Qingyou Xia
- State Key Laboratory of Silkworm Genome Biology, Southwest University, Chongqing 400716, China; Chongqing Engineering and Technology Research Center for Novel Silk Materials, Chongqing 400716, China.
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58
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Hou Y, Zhang Y, Gong J, Tian S, Li J, Dong Z, Guo C, Peng L, Zhao P, Xia Q. Comparative proteomics analysis of silkworm hemolymph during the stages of metamorphosis via liquid chromatography and mass spectrometry. Proteomics 2016; 16:1421-31. [DOI: 10.1002/pmic.201500427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Revised: 01/20/2016] [Accepted: 03/03/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Yong Hou
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Yan Zhang
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Jing Gong
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Sha Tian
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Jianwei Li
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Zhaoming Dong
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Chao Guo
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Li Peng
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Ping Zhao
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
| | - Qingyou Xia
- State Key Laboratory of Silkworm Genome Biology, College of Biotechnology; Southwest University; Beibei, Chongqing P. R. China
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Mamta, Reddy KRK, Rajam MV. Targeting chitinase gene of Helicoverpa armigera by host-induced RNA interference confers insect resistance in tobacco and tomato. PLANT MOLECULAR BIOLOGY 2016; 90:281-92. [PMID: 26659592 DOI: 10.1007/s11103-015-0414-y] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 11/27/2015] [Indexed: 05/03/2023]
Abstract
Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) is a devastating agricultural insect pest with broad spectrum of host range, causing million dollars crop loss annually. Limitations in the present conventional and transgenic approaches have made it crucial to develop sustainable and environmental friendly methods for crop improvement. In the present study, host-induced RNA interference (HI-RNAi) approach was used to develop H. armigera resistant tobacco and tomato plants. Chitinase (HaCHI) gene, critically required for insect molting and metamorphosis was selected as a potential target. Hair-pin RNAi construct was prepared from the conserved off-target free partial HaCHI gene sequence and was used to generate several HaCHI-RNAi tobacco and tomato plants. Northern hybridization confirmed the production of HaCHI gene-specific siRNAs in HaCHI-RNAi tobacco and tomato lines. Continuous feeding on leaves of RNAi lines drastically reduced the target gene transcripts and consequently, affected the overall growth and survival of H. armigera. Various developmental deformities were also manifested in H. armigera larvae after feeding on the leaves of RNAi lines. These results demonstrated the role of chitinase in insect development and potential of HI-RNAi for effective management of H. armigera.
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Affiliation(s)
- Mamta
- Department of Genetics, University of Delhi South Campus, Benito Juarez Marg, New Delhi, 110021, India
| | - K R K Reddy
- Sri Biotech Laboratory India Ltd., Street No. 2, Sagar Society, Road No. 2, Banjara Hills, Hyderabad, 500034, India
| | - M V Rajam
- Department of Genetics, University of Delhi South Campus, Benito Juarez Marg, New Delhi, 110021, India.
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Preparation and characterization of cross-linked carboxymethyl chitin porous membrane scaffold for biomedical applications. Carbohydr Polym 2015; 126:150-5. [DOI: 10.1016/j.carbpol.2015.02.050] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 02/10/2015] [Accepted: 02/18/2015] [Indexed: 11/20/2022]
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61
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Molecular characterisation and functional analysis of LsChi2, a chitinase found in the salmon louse (Lepeophtheirus salmonis salmonis, Krøyer 1838). Exp Parasitol 2015; 151-152:39-48. [DOI: 10.1016/j.exppara.2015.01.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Revised: 01/22/2015] [Accepted: 01/26/2015] [Indexed: 12/18/2022]
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