1
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Yuasa H, Morino N, Wagatsuma T, Munekane M, Ueda S, Matsunaga M, Uchida Y, Katayama T, Katoh T, Kambe T. ZNT5-6 and ZNT7 play an integral role in protein N-glycosylation by supplying Zn 2+ to Golgi α-mannosidase II. J Biol Chem 2024; 300:107378. [PMID: 38762179 PMCID: PMC11209640 DOI: 10.1016/j.jbc.2024.107378] [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: 02/19/2024] [Revised: 04/20/2024] [Accepted: 05/07/2024] [Indexed: 05/20/2024] Open
Abstract
The stepwise addition of monosaccharides to N-glycans attached to client proteins to generate a repertoire of mature proteins involves a concerted action of many glycosidases and glycosyltransferases. Here, we report that Golgi α-mannosidase II (GMII), a pivotal enzyme catalyzing the first step in the conversion of hybrid- to complex-type N-glycans, is activated by Zn2+ supplied by the early secretory compartment-resident ZNT5-ZNT6 heterodimers (ZNT5-6) and ZNT7 homodimers (ZNT7). Loss of ZNT5-6 and ZNT7 function results in marked accumulation of hybrid-type and complex/hybrid glycans with concomitant reduction of complex- and high-mannose-type glycans. In cells lacking the ZNT5-6 and ZNT7 functions, the GMII activity is substantially decreased. In contrast, the activity of its homolog, lysosomal mannosidase (LAMAN), is not decreased. Moreover, we show that the growth of pancreatic cancer MIA PaCa-2 cells lacking ZNT5-6 and ZNT7 is significantly decreased in a nude mouse xenograft model. Our results indicate the integral roles of ZNT5-6 and ZNT7 in N-glycosylation and highlight their potential as novel target proteins for cancer therapy.
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Affiliation(s)
- Hana Yuasa
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Naho Morino
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Takumi Wagatsuma
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Masayuki Munekane
- Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Sachiko Ueda
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Mayu Matsunaga
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Yasuo Uchida
- Department of Molecular Systems Pharmaceutics, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima City, Japan
| | - Takane Katayama
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Toshihiko Katoh
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan
| | - Taiho Kambe
- Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kyoto, Japan.
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2
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Laghmani K. Protein Quality Control of NKCC2 in Bartter Syndrome and Blood Pressure Regulation. Cells 2024; 13:818. [PMID: 38786040 PMCID: PMC11120568 DOI: 10.3390/cells13100818] [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: 04/01/2024] [Revised: 05/03/2024] [Accepted: 05/09/2024] [Indexed: 05/25/2024] Open
Abstract
Mutations in NKCC2 generate antenatal Bartter syndrome type 1 (type 1 BS), a life-threatening salt-losing nephropathy characterized by arterial hypotension, as well as electrolyte abnormalities. In contrast to the genetic inactivation of NKCC2, inappropriate increased NKCC2 activity has been associated with salt-sensitive hypertension. Given the importance of NKCC2 in salt-sensitive hypertension and the pathophysiology of prenatal BS, studying the molecular regulation of this Na-K-2Cl cotransporter has attracted great interest. Therefore, several studies have addressed various aspects of NKCC2 regulation, such as phosphorylation and post-Golgi trafficking. However, the regulation of this cotransporter at the pre-Golgi level remained unknown for years. Similar to several transmembrane proteins, export from the ER appears to be the rate-limiting step in the cotransporter's maturation and trafficking to the plasma membrane. The most compelling evidence comes from patients with type 5 BS, the most severe form of prenatal BS, in whom NKCC2 is not detectable in the apical membrane of thick ascending limb (TAL) cells due to ER retention and ER-associated degradation (ERAD) mechanisms. In addition, type 1 BS is one of the diseases linked to ERAD pathways. In recent years, several molecular determinants of NKCC2 export from the ER and protein quality control have been identified. The aim of this review is therefore to summarize recent data regarding the protein quality control of NKCC2 and to discuss their potential implications in BS and blood pressure regulation.
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Affiliation(s)
- Kamel Laghmani
- Centre de Recherche des Cordeliers, INSERM, Sorbonne Université, Université de Paris, F-75006 Paris, France;
- CNRS, ERL8228, F-75006 Paris, France
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3
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Liu FF, Wang M, Ma GH, Kulinich A, Liu L, Voglmeir J. Characterization of Solitalea canadensis α-mannosidase with specific activity towards α1,3-Mannosidic linkages. Carbohydr Res 2024; 538:109100. [PMID: 38555657 DOI: 10.1016/j.carres.2024.109100] [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: 02/03/2024] [Revised: 03/20/2024] [Accepted: 03/25/2024] [Indexed: 04/02/2024]
Abstract
A recombinant exo-α-mannosidase from Solitalea canadensis (Sc3Man) has been characterized to exhibit strict specificity for hydrolyzing α1,3-mannosidic linkages located at the non-reducing end of glycans containing α-mannose. Enzymatic characterization revealed that Sc3Man operates optimally at a pH of 5.0 and at a temperature of 37 °C. The enzymatic activity was notably enhanced twofold in the presence of Ca2+ ions, emphasizing its potential dependency on this metal ion, while Cu2+ and Zn2+ ions notably impaired enzyme function. Sc3Man was able to efficiently cleave the terminal α1,3 mannose residue from various high-mannose N-glycan structures and from the model glycoprotein RNase B. This work not only expands the categorical scope of bacterial α-mannosidases, but also offers new insight into the glycan metabolism of S. canadensis, highlighting the enzyme's utility for glycan analysis and potential biotechnological applications.
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Affiliation(s)
- Fang-Fang Liu
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Meng Wang
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Guan-Hua Ma
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Anna Kulinich
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China
| | - Li Liu
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China.
| | - Josef Voglmeir
- Glycomics and Glycan Bioengineering Research Center (GGBRC), College of Food Science and Technology, Nanjing Agricultural University, Nanjing, People's Republic of China.
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4
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Baboo S, Diedrich JK, Torres JL, Copps J, Singh B, Garrett PT, Ward AB, Paulson JC, Yates JR. Evolving spike-protein N-glycosylation in SARS-CoV-2 variants. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.08.539897. [PMID: 37214937 PMCID: PMC10197516 DOI: 10.1101/2023.05.08.539897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Since >3 years, SARS-CoV-2 has plunged humans into a colossal pandemic. Henceforth, multiple waves of infection have swept through the human population, led by variants that were able to partially evade acquired immunity. The co-evolution of SARS-CoV-2 variants with human immunity provides an excellent opportunity to study the interaction between viral pathogens and their human hosts. The heavily N-glycosylated spike-protein of SARS-CoV-2 plays a pivotal role in initiating infection and is the target for host immune-response, both of which are impacted by host-installed N-glycans. Using highly-sensitive DeGlyPHER approach, we compared the N-glycan landscape on spikes of the SARS-CoV-2 Wuhan-Hu-1 strain to seven WHO-defined variants of concern/interest, using recombinantly expressed, soluble spike-protein trimers, sharing same stabilizing-mutations. We found that N-glycan processing is conserved at most sites. However, in multiple variants, processing of N-glycans from high mannose- to complex-type is reduced at sites N165, N343 and N616, implicated in spike-protein function.
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Affiliation(s)
- Sabyasachi Baboo
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Jolene K. Diedrich
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Jonathan L. Torres
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Jeffrey Copps
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Bhavya Singh
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Patrick T. Garrett
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
| | - Andrew B. Ward
- Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - James C. Paulson
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
- Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, California 92037, United States
| | - John R. Yates
- Department of Molecular Medicine, The Scripps Research Institute, La Jolla, California 92037, United States
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5
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Huang S, Haga Y, Li J, Zhang J, Kweon HK, Seino J, Hirayama H, Fujita M, Moremen KW, Andrews P, Suzuki T, Wang Y. Mitotic phosphorylation inhibits the Golgi mannosidase MAN1A1. Cell Rep 2022; 41:111679. [DOI: 10.1016/j.celrep.2022.111679] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 08/16/2022] [Accepted: 10/25/2022] [Indexed: 11/23/2022] Open
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6
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Golgi Metal Ion Homeostasis in Human Health and Diseases. Cells 2022; 11:cells11020289. [PMID: 35053405 PMCID: PMC8773785 DOI: 10.3390/cells11020289] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/31/2021] [Accepted: 01/11/2022] [Indexed: 12/24/2022] Open
Abstract
The Golgi apparatus is a membrane organelle located in the center of the protein processing and trafficking pathway. It consists of sub-compartments with distinct biochemical compositions and functions. Main functions of the Golgi, including membrane trafficking, protein glycosylation, and sorting, require a well-maintained stable microenvironment in the sub-compartments of the Golgi, along with metal ion homeostasis. Metal ions, such as Ca2+, Mn2+, Zn2+, and Cu2+, are important cofactors of many Golgi resident glycosylation enzymes. The homeostasis of metal ions in the secretory pathway, which is required for proper function and stress response of the Golgi, is tightly regulated and maintained by transporters. Mutations in the transporters cause human diseases. Here we provide a review specifically focusing on the transporters that maintain Golgi metal ion homeostasis under physiological conditions and their alterations in diseases.
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7
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Demaretz S, Seaayfan E, Bakhos-Douaihy D, Frachon N, Kömhoff M, Laghmani K. Golgi Alpha1,2-Mannosidase IA Promotes Efficient Endoplasmic Reticulum-Associated Degradation of NKCC2. Cells 2021; 11:cells11010101. [PMID: 35011665 PMCID: PMC8750359 DOI: 10.3390/cells11010101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2021] [Revised: 12/24/2021] [Accepted: 12/27/2021] [Indexed: 12/18/2022] Open
Abstract
Mutations in the apically located kidney Na-K-2Cl cotransporter NKCC2 cause type I Bartter syndrome, a life-threatening kidney disorder. We previously showed that transport from the ER represents the limiting phase in NKCC2 journey to the cell surface. Yet very little is known about the ER quality control components specific to NKCC2 and its disease-causing mutants. Here, we report the identification of Golgi alpha1, 2-mannosidase IA (ManIA) as a novel binding partner of the immature form of NKCC2. ManIA interaction with NKCC2 takes place mainly at the cis-Golgi network. ManIA coexpression decreased total NKCC2 protein abundance whereas ManIA knock-down produced the opposite effect. Importantly, ManIA coexpression had a more profound effect on NKCC2 folding mutants. Cycloheximide chase assay showed that in cells overexpressing ManIA, NKCC2 stability and maturation are heavily hampered. Deleting the cytoplasmic region of ManIA attenuated its interaction with NKCC2 and inhibited its effect on the maturation of the cotransporter. ManIA-induced reductions in NKCC2 expression were offset by the proteasome inhibitor MG132. Likewise, kifunensine treatment greatly reduced ManIA effect, strongly suggesting that mannose trimming is involved in the enhanced ERAD of the cotransporter. Moreover, depriving ManIA of its catalytic domain fully abolished its effect on NKCC2. In summary, our data demonstrate the presence of a ManIA-mediated ERAD pathway in renal cells promoting retention and degradation of misfolded NKCC2 proteins. They suggest a model whereby Golgi ManIA contributes to ERAD of NKCC2, by promoting the retention, recycling, and ERAD of misfolded proteins that initially escape protein quality control surveillance within the ER.
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Affiliation(s)
- Sylvie Demaretz
- Centre de Recherche des Cordeliers, Sorbonne Université, Inserm, Université de Paris, F-75006 Paris, France; (S.D.); (E.S.); (D.B.-D.); (N.F.)
- CNRS, ERL8228, F-75006 Paris, France
| | - Elie Seaayfan
- Centre de Recherche des Cordeliers, Sorbonne Université, Inserm, Université de Paris, F-75006 Paris, France; (S.D.); (E.S.); (D.B.-D.); (N.F.)
- CNRS, ERL8228, F-75006 Paris, France
| | - Dalal Bakhos-Douaihy
- Centre de Recherche des Cordeliers, Sorbonne Université, Inserm, Université de Paris, F-75006 Paris, France; (S.D.); (E.S.); (D.B.-D.); (N.F.)
- CNRS, ERL8228, F-75006 Paris, France
| | - Nadia Frachon
- Centre de Recherche des Cordeliers, Sorbonne Université, Inserm, Université de Paris, F-75006 Paris, France; (S.D.); (E.S.); (D.B.-D.); (N.F.)
- CNRS, ERL8228, F-75006 Paris, France
| | - Martin Kömhoff
- Division of Pediatric Nephrology and Transplantation, University Children’s Hospital, Philipps-University, 35043 Marburg, Germany;
| | - Kamel Laghmani
- Centre de Recherche des Cordeliers, Sorbonne Université, Inserm, Université de Paris, F-75006 Paris, France; (S.D.); (E.S.); (D.B.-D.); (N.F.)
- CNRS, ERL8228, F-75006 Paris, France
- Correspondence:
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8
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Manica G, Ghenea S, Munteanu CVA, Martin EC, Butnaru C, Surleac M, Chiritoiu GN, Alexandru PR, Petrescu AJ, Petrescu SM. EDEM3 Domains Cooperate to Perform Its Overall Cell Functioning. Int J Mol Sci 2021; 22:2172. [PMID: 33671632 PMCID: PMC7926307 DOI: 10.3390/ijms22042172] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2021] [Revised: 02/15/2021] [Accepted: 02/19/2021] [Indexed: 01/20/2023] Open
Abstract
EDEM3 recognizes and directs misfolded proteins to the ER-associated protein degradation (ERAD) process. EDEM3 was predicted to act as lectin or as a mannosidase because of its homology with the GH47 catalytic domain of the Man1B1, but the contribution of the other regions remained unresolved. Here, we dissect the molecular determinants governing EDEM3 function and its cellular interactions. LC/MS analysis indicates very few stable ER interactors, suggesting EDEM3 availability for transient substrate interactions. Sequence analysis reveals that EDEM3 consists of four consecutive modules defined as GH47, intermediate (IMD), protease-associated (PA), and intrinsically disordered (IDD) domain. Using an EDEM3 knock-out cell line, we expressed EDEM3 and domain deletion mutants to address EDEM3 function. We find that the mannosidase domain provides substrate binding even in the absence of mannose trimming and requires the IMD domain for folding. The PA and IDD domains deletions do not impair the trimming, but specifically modulate the turnover of two misfolded proteins, NHK and the soluble tyrosinase mutant. Hence, we demonstrate that EDEM3 provides a unique ERAD timing to misfolded glycoproteins, not only by its mannose trimming activity, but also by the positive and negative feedback modulated by the protease-associated and intrinsically disordered domain, respectively.
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Affiliation(s)
- Georgiana Manica
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (G.M.); (S.G.); (G.N.C.); (P.R.A.)
| | - Simona Ghenea
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (G.M.); (S.G.); (G.N.C.); (P.R.A.)
| | - Cristian V. A. Munteanu
- Department of Bioinformatics and Structural Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (E.C.M.); (C.B.); (M.S.); (A.-J.P.)
| | - Eliza C. Martin
- Department of Bioinformatics and Structural Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (E.C.M.); (C.B.); (M.S.); (A.-J.P.)
| | - Cristian Butnaru
- Department of Bioinformatics and Structural Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (E.C.M.); (C.B.); (M.S.); (A.-J.P.)
| | - Marius Surleac
- Department of Bioinformatics and Structural Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (E.C.M.); (C.B.); (M.S.); (A.-J.P.)
- Research Institute of the University of Bucharest, 030018 Bucharest 17, Romania
| | - Gabriela N. Chiritoiu
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (G.M.); (S.G.); (G.N.C.); (P.R.A.)
| | - Petruta R. Alexandru
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (G.M.); (S.G.); (G.N.C.); (P.R.A.)
| | - Andrei-Jose Petrescu
- Department of Bioinformatics and Structural Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (E.C.M.); (C.B.); (M.S.); (A.-J.P.)
| | - Stefana M. Petrescu
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (G.M.); (S.G.); (G.N.C.); (P.R.A.)
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9
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Li H, Wang G, Yu Y, Jian W, Zhang D, Wang Y, Wang T, Meng Y, Yuan C, Zhang C. α-1,2-Mannosidase MAN1C1 Inhibits Proliferation and Invasion of Clear Cell Renal Cell Carcinoma. J Cancer 2018; 9:4618-4626. [PMID: 30588245 PMCID: PMC6299394 DOI: 10.7150/jca.27673] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Accepted: 10/01/2018] [Indexed: 01/08/2023] Open
Abstract
Background: This study investigated the biological function of the gene MAN1C1 α-mannosidase in renal cell carcinoma. It has been reported that MAN1C1 is probably a potential tumor suppressor gene in Wilms. However, the role of MAN1C1 in human clear cell renal cell carcinoma (ccRCC) has not been reported. Methods: In this study, MAN1C1 gene over-expression was used to transfect human renal cancer cell lines 786-O and OS-RC-2 to study apoptosis and the underlying mechanisms which influence epithelial-mesenchymal transition. Results: MAN1C1 was down-regulated in ccRCC and related to the clinicopathological factors and prognosis of ccRCC. We revealed that over-expression MAN1C1 showed anti-tumor effect by inducing apoptosis, as determined by Cell Counting Kit-8 (CCK-8) assay, cell cycle analysis, and western blot analysis. What's more, MAN1C1 over-expression remarkably increased the ratio of Bax/Bcl-2 and inhibited epithelial-mesenchymal transition by increasing the expression of E-CA. In addition, the ratio of Bax/Bcl-2 and E-CA were also increased in MAN1C1 gene over-expression renal cancer cells compared with the control cells. Conclusion: We find that re-expression of silenced MAN1C1 in ccRCC cell lines inhibited cell viability, colony formation, induced apoptosis, suppressed cell invasion and migration. In conclusion, MAN1C1 is a novel functional tumor suppressor in renal carcinogenesis. This is the first time that the function of MAN1C1 gene has been verified in the renal tumor tissue so far.
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Affiliation(s)
- Haoming Li
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Gang Wang
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yipeng Yu
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Wengang Jian
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Daming Zhang
- Department of Neurosurgery, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yongquan Wang
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Tengda Wang
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Yuyang Meng
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Chao Yuan
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Cheng Zhang
- Department of Urology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang Province, China
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10
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Tu HC, Hsiao YC, Yang WY, Tsai SL, Lin HK, Liao CY, Lu JW, Chou YT, Wang HD, Yuh CH. Up-regulation of golgi α-mannosidase IA and down-regulation of golgi α-mannosidase IC activates unfolded protein response during hepatocarcinogenesis. Hepatol Commun 2017; 1:230-247. [PMID: 29404456 PMCID: PMC5721452 DOI: 10.1002/hep4.1032] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 02/27/2017] [Accepted: 03/09/2017] [Indexed: 12/27/2022] Open
Abstract
α‐1,2 mannosidases, key enzymes in N‐glycosylation, are required for the formation of mature glycoproteins in eukaryotes. Aberrant regulation of α‐1,2 mannosidases can result in cancer, although the underlying mechanisms are unclear. Here, we report the distinct roles of α‐1,2 mannosidase subtypes (MAN1A, MAN1B, ERMAN1, MAN1C) in the formation of hepatocellular carcinoma (HCC). Clinicopathological analyses revealed that the clinical stage, tumor size, α‐fetoprotein level, and invasion status were positively correlated with the expression levels of MAN1A1, MAN1B1, and MAN1A2. In contrast, the expression of MAN1C1 was decreased as early as stage I of HCC. Survival analyses showed that high MAN1A1, MAN1A2, and MAN1B1 expression levels combined with low MAN1C1 expression levels were significantly correlated with shorter overall survival rates. Functionally, the overexpression of MAN1A1 promoted proliferation, migration, and transformation as well as in vivo migration in zebrafish. Conversely, overexpression of MAN1C1 reduced the migration ability both in vitro and in vivo, decreased the colony formation ability, and shortened the S phase of the cell cycle. Furthermore, the expression of genes involved in cell cycle/proliferation and migration was increased in MAN1A1‐overexpressing cells but decreased in MAN1C1‐overexpressing cells. MAN1A1 activated the expression of key regulators of the unfolded protein response (UPR), while treatment with endoplasmic reticulum stress inhibitors blocked the expression of MAN1A1‐activated genes. Using the MAN1A1 liver‐specific overexpression zebrafish model, we observed steatosis and inflammation at earlier stages and HCC formation at a later stage accompanied by the increased expression of the UPR modulator binding immunoglobulin protein (BiP). These data suggest that the up‐regulation of MAN1A1 activates the UPR and might initiate metastasis. Conclusion: MAN1A1 represents a novel oncogene while MAN1C1 plays a role in tumor suppression in hepatocarcinogenesis. (Hepatology Communications 2017;1:230‐247)
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Affiliation(s)
- Hsiao-Chen Tu
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Institute of Biotechnology National Tsing-Hua University Hsinchu Taiwan
| | - Yung-Chun Hsiao
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Institute of Biotechnology National Tsing-Hua University Hsinchu Taiwan
| | - Wan-Yu Yang
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan
| | - Shin-Lin Tsai
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan
| | - Hua-Kuo Lin
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan
| | - Chong-Yi Liao
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Institute of Biotechnology National Tsing-Hua University Hsinchu Taiwan
| | - Jeng-Wei Lu
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Department of Life Sciences National Central University Jhongli City Taoyuan Taiwan
| | - Yu-Ting Chou
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Institute of Biotechnology National Tsing-Hua University Hsinchu Taiwan
| | - Horng-Dar Wang
- Institute of Biotechnology National Tsing-Hua University Hsinchu Taiwan
| | - Chiou-Hwa Yuh
- Institute of Molecular and Genomic Medicine National Health Research Institutes Zhunan Miaoli Taiwan.,Institute of Bioinformatics and Structural Biology National Tsing-Hua University Hsinchu Taiwan.,Department of Biological Science and Technology National Chiao Tung University Hsinchu Taiwan.,Kaohsiung Medical University Kaohsiung Taiwan
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11
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Substrate recognition and catalysis by GH47 α-mannosidases involved in Asn-linked glycan maturation in the mammalian secretory pathway. Proc Natl Acad Sci U S A 2016; 113:E7890-E7899. [PMID: 27856750 DOI: 10.1073/pnas.1611213113] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Maturation of Asn-linked oligosaccharides in the eukaryotic secretory pathway requires the trimming of nascent glycan chains to remove all glucose and several mannose residues before extension into complex-type structures on the cell surface and secreted glycoproteins. Multiple glycoside hydrolase family 47 (GH47) α-mannosidases, including endoplasmic reticulum (ER) α-mannosidase I (ERManI) and Golgi α-mannosidase IA (GMIA), are responsible for cleavage of terminal α1,2-linked mannose residues to produce uniquely trimmed oligomannose isomers that are necessary for ER glycoprotein quality control and glycan maturation. ERManI and GMIA have similar catalytic domain structures, but each enzyme cleaves distinct residues from tribranched oligomannose glycan substrates. The structural basis for branch-specific cleavage by ERManI and GMIA was explored by replacing an essential enzyme-bound Ca2+ ion with a lanthanum (La3+) ion. This ion swap led to enzyme inactivation while retaining high-affinity substrate interactions. Cocrystallization of La3+-bound enzymes with Man9GlcNAc2 substrate analogs revealed enzyme-substrate complexes with distinct modes of glycan branch insertion into the respective enzyme active-site clefts. Both enzymes had glycan interactions that extended across the entire glycan structure, but each enzyme engaged a different glycan branch and used different sets of glycan interactions. Additional mutagenesis and time-course studies of glycan cleavage probed the structural basis of enzyme specificity. The results provide insights into the enzyme catalytic mechanisms and reveal structural snapshots of the sequential glycan cleavage events. The data also indicate that full steric access to glycan substrates determines the efficiency of mannose-trimming reactions that control the conversion to complex-type structures in mammalian cells.
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Del Val IJ, Polizzi KM, Kontoravdi C. A theoretical estimate for nucleotide sugar demand towards Chinese Hamster Ovary cellular glycosylation. Sci Rep 2016; 6:28547. [PMID: 27345611 PMCID: PMC4921913 DOI: 10.1038/srep28547] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Accepted: 06/03/2016] [Indexed: 01/18/2023] Open
Abstract
Glycosylation greatly influences the safety and efficacy of many of the highest-selling recombinant therapeutic proteins (rTPs). In order to define optimal cell culture feeding strategies that control rTP glycosylation, it is necessary to know how nucleotide sugars (NSs) are consumed towards host cell and rTP glycosylation. Here, we present a theoretical framework that integrates the reported glycoproteome of CHO cells, the number of N-linked and O-GalNAc glycosylation sites on individual host cell proteins (HCPs), and the carbohydrate content of CHO glycosphingolipids to estimate the demand of NSs towards CHO cell glycosylation. We have identified the most abundant N-linked and O-GalNAc CHO glycoproteins, obtained the weighted frequency of N-linked and O-GalNAc glycosites across the CHO cell proteome, and have derived stoichiometric coefficients for NS consumption towards CHO cell glycosylation. By combining the obtained stoichiometric coefficients with previously reported data for specific growth and productivity of CHO cells, we observe that the demand of NSs towards glycosylation is significant and, thus, is required to better understand the burden of glycosylation on cellular metabolism. The estimated demand of NSs towards CHO cell glycosylation can be used to rationally design feeding strategies that ensure optimal and consistent rTP glycosylation.
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Affiliation(s)
- Ioscani Jimenez Del Val
- School of Chemical &Bioprocess Engineering, University College Dublin, Belfield campus, Dublin 4, Ireland.,Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K
| | - Karen M Polizzi
- Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K.,Centre for Synthetic Biology and Innovation, Department of Life Sciences, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Cleo Kontoravdi
- Centre for Process Systems Engineering, Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, U.K
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'Click chemistry' synthesis of 1-(α-D-mannopyranosyl)-1,2,3-triazoles for inhibition of α-mannosidases. Carbohydr Res 2015; 406:34-40. [PMID: 25658064 DOI: 10.1016/j.carres.2015.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Revised: 01/09/2015] [Accepted: 01/11/2015] [Indexed: 12/14/2022]
Abstract
Three new triazole conjugates derived from d-mannose were synthesized and assayed in in vitro assays to investigate their ability to inhibit α-mannosidase enzymes from the glycoside hydrolase (GH) families 38 and 47. The triazole conjugates were more selective for a GH47 α-mannosidase (Aspergillus saitoi α1,2-mannosidase), showing inhibition at the micromolar level (IC50 values of 50-250 μM), and less potent towards GH38 mannosidases (IC50 values in the range of 0.5-6 mM towards jack bean α-mannosidase or Drosophila melanogaster lysosomal and Golgi α-mannosidases). The highest selectivity ratio [IC50(GH38)/IC50(GH47)] of 100 was exhibited by the phenyltriazole conjugate. To understand structure-activity properties of synthesized compounds, 3-D complexes of inhibitors with α-mannosidases were built using molecular docking calculations.
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Mathieu-Rivet E, Scholz M, Arias C, Dardelle F, Schulze S, Le Mauff F, Teo G, Hochmal AK, Blanco-Rivero A, Loutelier-Bourhis C, Kiefer-Meyer MC, Fufezan C, Burel C, Lerouge P, Martinez F, Bardor M, Hippler M. Exploring the N-glycosylation pathway in Chlamydomonas reinhardtii unravels novel complex structures. Mol Cell Proteomics 2013; 12:3160-83. [PMID: 23912651 PMCID: PMC3820931 DOI: 10.1074/mcp.m113.028191] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 08/01/2013] [Indexed: 01/13/2023] Open
Abstract
Chlamydomonas reinhardtii is a green unicellular eukaryotic model organism for studying relevant biological and biotechnological questions. The availability of genomic resources and the growing interest in C. reinhardtii as an emerging cell factory for the industrial production of biopharmaceuticals require an in-depth analysis of protein N-glycosylation in this organism. Accordingly, we used a comprehensive approach including genomic, glycomic, and glycoproteomic techniques to unravel the N-glycosylation pathway of C. reinhardtii. Using mass-spectrometry-based approaches, we found that both endogenous soluble and membrane-bound proteins carry predominantly oligomannosides ranging from Man-2 to Man-5. In addition, minor complex N-linked glycans were identified as being composed of partially 6-O-methylated Man-3 to Man-5 carrying one or two xylose residues. These findings were supported by results from a glycoproteomic approach that led to the identification of 86 glycoproteins. Here, a combination of in-source collision-induced dissodiation (CID) for glycan fragmentation followed by mass tag-triggered CID for peptide sequencing and PNGase F treatment of glycopeptides in the presence of (18)O-labeled water in conjunction with CID mass spectrometric analyses were employed. In conclusion, our data support the notion that the biosynthesis and maturation of N-linked glycans in the endoplasmic reticulum and Golgi apparatus occur via a GnT I-independent pathway yielding novel complex N-linked glycans that maturate differently from their counterparts in land plants.
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Affiliation(s)
- Elodie Mathieu-Rivet
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Martin Scholz
- ¶Institute of Plant Biology and Biotechnology, Schlossplatz 8, University of Münster, D-48143, Germany
| | - Carolina Arias
- ‖Comisión Docente de Fisiología Vegetal, Departamento de Biología, Edificio de Biología Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Flavien Dardelle
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Stefan Schulze
- ¶Institute of Plant Biology and Biotechnology, Schlossplatz 8, University of Münster, D-48143, Germany
| | - François Le Mauff
- ‡‡Bioprocessing Technology Institute, Agency for Science Technology and Research (A*STAR), 20 Biopolis Way, #06-01, Centros, Singapore, 138668
| | - Gavin Teo
- ‡‡Bioprocessing Technology Institute, Agency for Science Technology and Research (A*STAR), 20 Biopolis Way, #06-01, Centros, Singapore, 138668
| | - Ana Karina Hochmal
- ¶Institute of Plant Biology and Biotechnology, Schlossplatz 8, University of Münster, D-48143, Germany
| | - Amaya Blanco-Rivero
- ‖Comisión Docente de Fisiología Vegetal, Departamento de Biología, Edificio de Biología Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Corinne Loutelier-Bourhis
- §§Université de Rouen, Laboratoire COBRA UMR 6014 & FR 3038, INSA de Rouen, 1 Rue Tesnière, 76821 Mont St Aignan Cedex, France
| | - Marie-Christine Kiefer-Meyer
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Christian Fufezan
- ¶Institute of Plant Biology and Biotechnology, Schlossplatz 8, University of Münster, D-48143, Germany
| | - Carole Burel
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Patrice Lerouge
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Flor Martinez
- ‖Comisión Docente de Fisiología Vegetal, Departamento de Biología, Edificio de Biología Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Muriel Bardor
- From the ‡Université de Rouen, Laboratoire Glyco-MEV, EA 4358, Institut de Recherche et d'Innovation Biomédicale (IRIB), 76821 Mont-Saint-Aignan Cedex, France
| | - Michael Hippler
- ¶Institute of Plant Biology and Biotechnology, Schlossplatz 8, University of Münster, D-48143, Germany
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Characterisation of class I and II α-mannosidases from Drosophila melanogaster. Glycoconj J 2013; 30:899-909. [DOI: 10.1007/s10719-013-9495-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2013] [Revised: 08/02/2013] [Accepted: 08/07/2013] [Indexed: 12/31/2022]
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16
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Horvat T, Deželjin M, Redžić I, Barišić D, Herak Bosnar M, Lauc G, Zoldoš V. Reversibility of membrane N-glycome of HeLa cells upon treatment with epigenetic inhibitors. PLoS One 2013; 8:e54672. [PMID: 23336012 PMCID: PMC3545996 DOI: 10.1371/journal.pone.0054672] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2012] [Accepted: 12/17/2012] [Indexed: 01/20/2023] Open
Abstract
Glycans are essential regulators of protein function and are now in the focus of research in many physiological and pathophysiological processes. There are numerous modes of regulating their biosynthesis, including epigenetic mechanisms implicated in the expression of glyco-genes. Since N-glycans located at the cell membrane define intercellular communication as well as a cellular response to a given environment, we developed a method to preferentially analyze this fraction of glycans. The method is based on incorporation of living cells into polyacrylamide gels, partial denaturation of membrane proteins with 3 M urea and subsequent release of N-glycans with PNGase F followed by HPLC analysis. Using this newly developed method, we revealed multiple effects of epigenetic inhibitors Trichostatin A, sodium butyrate and zebularine on the composition of N-glycans in human cells. The induced changes were found to be reversible after inhibitor removal. Given that many epigenetic inhibitors are currently explored as a therapeutic strategy in treatment of cancer, wherein surface glycans play an important role, the presented work contributes to our understanding of their efficiency in altering the N-glycan profile of cancer cells in culture.
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Affiliation(s)
| | | | - Irma Redžić
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Zagreb, Croatia
| | - Darko Barišić
- Faculty of Science, University of Zagreb, Zagreb, Croatia
| | | | - Gordan Lauc
- Faculty of Pharmacy and Biochemistry, University of Zagreb, Zagreb, Croatia
- Glycobiology Laboratory, Genos Ltd, Zagreb, Croatia
- Edith Cowan University, Perth, Australia
- * E-mail: (VZ); (GL)
| | - Vlatka Zoldoš
- Faculty of Science, University of Zagreb, Zagreb, Croatia
- * E-mail: (VZ); (GL)
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17
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Virtual screening and QSAR study of some pyrrolidine derivatives as α-mannosidase inhibitors for binding feature analysis. Bioorg Med Chem 2012; 20:6945-59. [DOI: 10.1016/j.bmc.2012.10.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 10/14/2012] [Indexed: 11/22/2022]
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18
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Thompson AJ, Dabin J, Iglesias-Fernández J, Ardèvol A, Dinev Z, Williams SJ, Bande O, Siriwardena A, Moreland C, Hu TC, Smith DK, Gilbert HJ, Rovira C, Davies GJ. The Reaction Coordinate of a Bacterial GH47 α-Mannosidase: A Combined Quantum Mechanical and Structural Approach. Angew Chem Int Ed Engl 2012; 51:10997-1001. [DOI: 10.1002/anie.201205338] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Indexed: 11/10/2022]
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19
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Thompson AJ, Dabin J, Iglesias-Fernández J, Ardèvol A, Dinev Z, Williams SJ, Bande O, Siriwardena A, Moreland C, Hu TC, Smith DK, Gilbert HJ, Rovira C, Davies GJ. The Reaction Coordinate of a Bacterial GH47 α-Mannosidase: A Combined Quantum Mechanical and Structural Approach. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205338] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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20
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Isoyama-Tanaka J, Dohi K, Misaki R, Fujiyama K. Improved expression and characterization of recombinant human Golgi α1,2-mannosidase I isoforms (IA2 and IC) by Escherichia coli. J Biosci Bioeng 2011; 112:14-9. [PMID: 21450520 DOI: 10.1016/j.jbiosc.2011.02.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Revised: 02/02/2011] [Accepted: 02/23/2011] [Indexed: 10/18/2022]
Abstract
Golgi α1,2-mannosidase I is involved in the N-linked oligosaccharide processing pathway. In this study, two truncated genes encoding for human Golgi α1,2-mannosidase I (hManIA2: amino acids 127-626 and hManIC: amino acids 118-617) were expressed in Escherichia coli to characterize the enzymes. These genes were fused to a T7 protein tag and a histidine tag at the N- and C-terminal ends, respectively, and purified using Co(2+) affinity chromatography. The properties including optimal temperature, optimal pH, and substrate specificity of the purified enzymes were investigated by HPLC using pyridylamino (PA)-labeled oligosaccharides as substrates. The stability of hManIA2 was dependent on the presence of Ca(2+), which was also required for its activity. On the other hand, hManIC was stable in the absence of Ca(2+), even though Ca(2+) was also effective for the activity of hManIC. While the similarity of the amino acid sequences is over 60%, hManIA2 and hManIC showed different substrate specificities particularly toward M9A and M8C.
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Affiliation(s)
- Junko Isoyama-Tanaka
- International Center for Biotechnology, Osaka University, 2–1 Yamada-oka, Suita, Osaka 565–0871, Japan
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21
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Baïet B, Burel C, Saint-Jean B, Louvet R, Menu-Bouaouiche L, Kiefer-Meyer MC, Mathieu-Rivet E, Lefebvre T, Castel H, Carlier A, Cadoret JP, Lerouge P, Bardor M. N-glycans of Phaeodactylum tricornutum diatom and functional characterization of its N-acetylglucosaminyltransferase I enzyme. J Biol Chem 2011; 286:6152-64. [PMID: 21169367 PMCID: PMC3057864 DOI: 10.1074/jbc.m110.175711] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 12/08/2010] [Indexed: 11/06/2022] Open
Abstract
N-glycosylation, a major co- and post-translational event in the synthesis of proteins in eukaryotes, is unknown in aquatic photosynthetic microalgae. In this paper, we describe the N-glycosylation pathway in the diatom Phaeodactylum tricornutum. Bio-informatic analysis of its genome revealed the presence of a complete set of sequences potentially encoding for proteins involved in the synthesis of the lipid-linked Glc(3)Man(9)GlcNAc(2)-PP-dolichol N-glycan, some subunits of the oligosaccharyltransferase complex, as well as endoplasmic reticulum glucosidases and chaperones required for protein quality control and, finally, the α-mannosidase I involved in the trimming of the N-glycan precursor into Man-5 N-glycan. Moreover, one N-acetylglucosaminyltransferase I, a Golgi glycosyltransferase that initiates the synthesis of complex type N-glycans, was predicted in the P. tricornutum genome. We demonstrated that this gene encodes for an active N-acetylglucosaminyltransferase I, which is able to restore complex type N-glycans maturation in the Chinese hamster ovary Lec1 mutant, defective in its endogeneous N-acetylglucosaminyltransferase I. Consistent with these data, the structural analyses of N-linked glycans demonstrated that P. tricornutum proteins carry mainly high mannose type N-glycans ranging from Man-5 to Man-9. Although representing a minor glycan population, paucimannose N-glycans were also detected, suggesting the occurrence of an N-acetylglucosaminyltransferase I-dependent maturation of N-glycans in this diatom.
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Affiliation(s)
- Bérengère Baïet
- Université de Rouen, Laboratoire Glycobiologie et Matrice Extracellulaire Végétale, Faculté des Sciences, 76821 Mont-Saint-Aignan Cédex, France
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Roth J, Zuber C, Park S, Jang I, Lee Y, Kysela KG, Le Fourn V, Santimaria R, Guhl B, Cho JW. Protein N-glycosylation, protein folding, and protein quality control. Mol Cells 2010; 30:497-506. [PMID: 21340671 DOI: 10.1007/s10059-010-0159-z] [Citation(s) in RCA: 119] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2010] [Accepted: 11/11/2010] [Indexed: 11/27/2022] Open
Abstract
Quality control of protein folding represents a fundamental cellular activity. Early steps of protein N-glycosylation involving the removal of three glucose and some specific mannose residues in the endoplasmic reticulum have been recognized as being of importance for protein quality control. Specific oligosaccharide structures resulting from the oligosaccharide processing may represent a glycocode promoting productive protein folding, whereas others may represent glyco-codes for routing not correctly folded proteins for dislocation from the endoplasmic reticulum to the cytosol and subsequent degradation. Although quality control of protein folding is essential for the proper functioning of cells, it is also the basis for protein folding disorders since the recognition and elimination of non-native conformers can result either in loss-of-function or pathological-gain-of-function. The machinery for protein folding control represents a prime example of an intricate interactome present in a single organelle, the endoplasmic reticulum. Here, current views of mechanisms for the recognition and retention leading to productive protein folding or the eventual elimination of misfolded glycoproteins in yeast and mammalian cells are reviewed.
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Affiliation(s)
- Jürgen Roth
- Department of Integrated OMICs for Biomedical Sciences, WCU Program of Graduate School, Yonsei University, Seoul 120-749, Korea.
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Bontjer I, Melchers M, Eggink D, David K, Moore JP, Berkhout B, Sanders RW. Stabilized HIV-1 envelope glycoprotein trimers lacking the V1V2 domain, obtained by virus evolution. J Biol Chem 2010; 285:36456-70. [PMID: 20826824 DOI: 10.1074/jbc.m110.156588] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The envelope glycoproteins (Env) are the focus of HIV-1 vaccine development strategies based on the induction of humoral immunity, but the mechanisms the virus has evolved to limit the induction and binding of neutralizing antibodies (NAbs) constitute substantial obstacles. Conserved neutralization epitopes are shielded by variable regions and carbohydrates, so one strategy to increase their exposure and, it is hoped, their immunogenicity is to delete the overlying variable loops. However, deleting the variable regions from Env trimers can be problematic, because hydrophobic patches that are normally solvent-inaccessible now become exposed, causing protein misfolding or aggregation, for example. Here, we describe the construction and characterization of recombinant gp140 trimers lacking variable domains 1 and 2 (ΔV1V2). The design of the trimers was guided by HIV-1 evolution studies that identified compensatory changes in V1V2-deleted but functional Env proteins (Bontjer, I., Land, A., Eggink, D., Verkade, E., Tuin, K., Baldwin, C., Pollakis, G., Paxton, W. A., Braakman, I., Berkhout, B., and Sanders, R. W. (2009) J. Virol. 83, 368-383). We now show that specific compensatory changes improved the function of ΔV1V2 Env proteins and hence HIV-1 replication. The changes acted by reducing the exposure of a hydrophobic surface either by replacing a hydrophobic residue with a hydrophilic one or by covering the surface with a glycan. The compensatory changes allowed the efficient expression of well folded, soluble gp140 trimers derived from various HIV-1 isolates. The evolved ΔV1V2 Env viruses were extremely sensitive to NAbs, indicating that neutralization epitopes are well exposed, which was confirmed by studies of NAb binding to the soluble ΔV1V2 gp140 trimers. These evolved ΔV1V2 trimers could be useful reagents for immunogenicity and structural studies.
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Affiliation(s)
- Ilja Bontjer
- Laboratory of Experimental Virology, Department of Medical Microbiology, Academic Medical Center of the University of Amsterdam, 1105 AZ Amsterdam, The Netherlands
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Cobucci-Ponzano B, Conte F, Strazzulli A, Capasso C, Fiume I, Pocsfalvi G, Rossi M, Moracci M. The molecular characterization of a novel GH38 α-mannosidase from the crenarchaeon Sulfolobus solfataricus revealed its ability in de-mannosylating glycoproteins. Biochimie 2010; 92:1895-907. [PMID: 20696204 DOI: 10.1016/j.biochi.2010.07.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Accepted: 07/29/2010] [Indexed: 02/03/2023]
Abstract
α-Mannosidases, important enzymes in the N-glycan processing and degradation in Eukaryotes, are frequently found in the genome of Bacteria and Archaea in which their function is still largely unknown. The α-mannosidase from the hyperthermophilic Crenarchaeon Sulfolobus solfataricus has been identified and purified from cellular extracts and its gene has been cloned and expressed in Escherichia coli. The gene, belonging to retaining GH38 mannosidases of the carbohydrate active enzyme classification, is abundantly expressed in this Archaeon. The purified α-mannosidase activity depends on a single Zn(2+) ion per subunit is inhibited by swainsonine with an IC(50) of 0.2 mM. The molecular characterization of the native and recombinant enzyme, named Ssα-man, showed that it is highly specific for α-mannosides and α(1,2), α(1,3), and α(1,6)-D-mannobioses. In addition, the enzyme is able to demannosylate Man(3)GlcNAc(2) and Man(7)GlcNAc(2) oligosaccharides commonly found in N-glycosylated proteins. More interestingly, Ssα-man removes mannose residues from the glycosidic moiety of the bovine pancreatic ribonuclease B, suggesting that it could process mannosylated proteins also in vivo. This is the first evidence that archaeal glycosidases are involved in the direct modification of glycoproteins.
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Affiliation(s)
- Beatrice Cobucci-Ponzano
- Institute of Protein Biochemistry - Consiglio Nazionale delle Ricerche, Via P. Castellino 111, 80131 Naples, Italy
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Mikami K, Yamaguchi D, Tateno H, Hu D, Qin SY, Kawasaki N, Yamada M, Matsumoto N, Hirabayashi J, Ito Y, Yamamoto K. The sugar-binding ability of human OS-9 and its involvement in ER-associated degradation. Glycobiology 2009; 20:310-21. [DOI: 10.1093/glycob/cwp175] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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26
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Kajiura H, Koiwa H, Nakazawa Y, Okazawa A, Kobayashi A, Seki T, Fujiyama K. Two Arabidopsis thaliana Golgi alpha-mannosidase I enzymes are responsible for plant N-glycan maturation. Glycobiology 2009; 20:235-47. [PMID: 19914916 DOI: 10.1093/glycob/cwp170] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
N-Glycosylation is an important post-translational modification that occurs in many secreted and membrane proteins in eukaryotic cells. Golgi alpha-mannosidase I hydrolases (MANI) are key enzymes that play a role in the early N-glycan modification pathway in the Golgi apparatus. In Arabidopsis thaliana, two putative MANI genes, AtMANIa (At3g21160) and AtMANIb (At1g51590), were identified. Biochemical analysis using bacterially produced recombinant AtMANI isoforms revealed that both AtMANI isoforms encode 1-deoxymannojirimycin-sensitive alpha-mannosidase I and act on Man(8)GlcNAc(2) and Man(9)GlcNAc(2) structures to yield Man(5)GlcNAc(2). Structures of hydrolytic intermediates accumulated in the AtMANI reactions indicate that AtMANIs employ hydrolytic pathways distinct from those of mammalian MANIs. In planta, AtMANI-GFP/DsRed fusion proteins were detected in the Golgi stacks. Arabidopsis mutant lines manIa-1, manIa-2, manIb-1, and manIb-2 showed N-glycan profiles similar to that of wild type. On the other hand, the manIa manIb double mutant lines produced Man(8)GlcNAc(2) as the predominant N-glycan and lacked plant-specific complex and hybrid N-glycans. These data indicate that either AtMANIa or AtMANIb can function as the Golgi alpha-mannosidase I that produces the Man(5)GlcNAc(2) N-glycan structure necessary for complex N-glycan synthesis.
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Affiliation(s)
- Hiroyuki Kajiura
- International Center for Biotechnology, Osaka University, Suita-shi, Osaka 565-0871, Japan
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Kim PJ, Lee DY, Jeong H. Centralized modularity of N-linked glycosylation pathways in mammalian cells. PLoS One 2009; 4:e7317. [PMID: 19802388 PMCID: PMC2750756 DOI: 10.1371/journal.pone.0007317] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Accepted: 09/15/2009] [Indexed: 12/02/2022] Open
Abstract
Glycosylation is a highly complex process to produce a diverse repertoire of cellular glycans that are attached to proteins and lipids. Glycans are involved in fundamental biological processes, including protein folding and clearance, cell proliferation and apoptosis, development, immune responses, and pathogenesis. One of the major types of glycans, N-linked glycans, is formed by sequential attachments of monosaccharides to proteins by a limited number of enzymes. Many of these enzymes can accept multiple N-linked glycans as substrates, thereby generating a large number of glycan intermediates and their intermingled pathways. Motivated by the quantitative methods developed in complex network research, we investigated the large-scale organization of such N-linked glycosylation pathways in mammalian cells. The N-linked glycosylation pathways are extremely modular, and are composed of cohesive topological modules that directly branch from a common upstream pathway of glycan synthesis. This unique structural property allows the glycan production between modules to be controlled by the upstream region. Although the enzymes act on multiple glycan substrates, indicating cross-talk between modules, the impact of the cross-talk on the module-specific enhancement of glycan synthesis may be confined within a moderate range by transcription-level control. The findings of the present study provide experimentally-testable predictions for glycosylation processes, and may be applicable to therapeutic glycoprotein engineering.
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Affiliation(s)
- Pan-Jun Kim
- Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
| | - Dong-Yup Lee
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, Singapore
- Bioprocessing Technology Institute, Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
- * E-mail: (DYL); (HJ)
| | - Hawoong Jeong
- Institute for the BioCentury, KAIST, Daejeon, South Korea
- Department of Physics, KAIST, Daejeon, South Korea
- * E-mail: (DYL); (HJ)
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29
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Cantú D, Nerinckx W, Reilly PJ. Theory and computation show that Asp463 is the catalytic proton donor in human endoplasmic reticulum α-(1→2)-mannosidase I. Carbohydr Res 2008; 343:2235-42. [DOI: 10.1016/j.carres.2008.05.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2008] [Revised: 05/07/2008] [Accepted: 05/13/2008] [Indexed: 11/25/2022]
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30
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Chen R, Pawlicki M, Hamilton B, Tolbert T. Enzyme-Catalyzed Synthesis of a Hybrid N-Linked Oligosaccharide using N-Acetylglucosaminyltransferase I. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200800265] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Structural biology of pectin degradation by Enterobacteriaceae. Microbiol Mol Biol Rev 2008; 72:301-16, table of contents. [PMID: 18535148 DOI: 10.1128/mmbr.00038-07] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
SUMMARY Pectin is a structural polysaccharide that is integral for the stability of plant cell walls. During soft rot infection, secreted virulence factors from pectinolytic bacteria such as Erwinia spp. degrade pectin, resulting in characteristic plant cell necrosis and tissue maceration. Catabolism of pectin and its breakdown products by pectinolytic bacteria occurs within distinct cellular environments. This process initiates outside the cell, continues within the periplasmic space, and culminates in the cytoplasm. Although pectin utilization is well understood at the genetic and biochemical levels, an inclusive structural description of pectinases and pectin binding proteins by both extracellular and periplasmic enzymes has been lacking, especially following the recent characterization of several periplasmic components and protein-oligogalacturonide complexes. Here we provide a comprehensive analysis of the protein folds and mechanisms of pectate lyases, polygalacturonases, and carbohydrate esterases and the binding specificities of two periplasmic pectic binding proteins from Enterobacteriaceae. This review provides a structural understanding of the molecular determinants of pectin utilization and the mechanisms driving catabolite selectivity and flow through the pathway.
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32
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Lobsanov YD, Yoshida T, Desmet T, Nerinckx W, Yip P, Claeyssens M, Herscovics A, Howell PL. Modulation of activity by Arg407: structure of a fungal alpha-1,2-mannosidase in complex with a substrate analogue. ACTA CRYSTALLOGRAPHICA SECTION D: BIOLOGICAL CRYSTALLOGRAPHY 2008; 64:227-36. [PMID: 18323617 DOI: 10.1107/s0907444907065572] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2007] [Accepted: 12/04/2007] [Indexed: 11/10/2022]
Abstract
Class I alpha-mannosidases (glycoside hydrolase family GH47) play key roles in the maturation of N-glycans and the ER-associated degradation of unfolded glycoproteins. The 1.95 A resolution structure of a fungal alpha-1,2-mannosidase in complex with the substrate analogue methyl-alpha-D-lyxopyranosyl-(1',2)-alpha-D-mannopyranoside (LM) shows the intact disaccharide spanning the -1/+1 subsites, with the D-lyxoside ring in the -1 subsite in the 1C4 chair conformation, and provides insight into the mechanism of catalysis. The absence of the C5' hydroxymethyl group on the D-lyxoside moiety results in the side chain of Arg407 adopting two alternative conformations: the minor one interacting with Asp375 and the major one interacting with both the D-lyxoside and the catalytic base Glu409, thus disrupting its function. Chemical modification of Asp375 has previously been shown to inactivate the enzyme. Taken together, the data suggest that Arg407, which belongs to the conserved sequence motif RPExxE, may act to modulate the activity of the enzyme. The proposed mechanism for modulating the activity is potentially a general mechanism for this superfamily.
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Affiliation(s)
- Yuri D Lobsanov
- Program in Molecular Structure and Function, Research Institute, The Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada
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33
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Hebert DN, Molinari M. In and out of the ER: protein folding, quality control, degradation, and related human diseases. Physiol Rev 2007; 87:1377-408. [PMID: 17928587 DOI: 10.1152/physrev.00050.2006] [Citation(s) in RCA: 484] [Impact Index Per Article: 28.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
A substantial fraction of eukaryotic gene products are synthesized by ribosomes attached at the cytosolic face of the endoplasmic reticulum (ER) membrane. These polypeptides enter cotranslationally in the ER lumen, which contains resident molecular chaperones and folding factors that assist their maturation. Native proteins are released from the ER lumen and are transported through the secretory pathway to their final intra- or extracellular destination. Folding-defective polypeptides are exported across the ER membrane into the cytosol and destroyed. Cellular and organismal homeostasis relies on a balanced activity of the ER folding, quality control, and degradation machineries as shown by the dozens of human diseases related to defective maturation or disposal of individual polypeptides generated in the ER.
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Affiliation(s)
- Daniel N Hebert
- Department of Biochemistry and Molecular Biology, Program in Molecular and Cellular Biology, University of Massachusetts, Amherst, Massachusetts 01003, USA.
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34
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Abbott DW, Boraston AB. A family 2 pectate lyase displays a rare fold and transition metal-assisted beta-elimination. J Biol Chem 2007; 282:35328-36. [PMID: 17881361 DOI: 10.1074/jbc.m705511200] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The family 2 pectate lyase from Yersinia enterocolitica (YePL2A), solved to 1.5A, reveals it to be the first prokaryotic protein reported to display the rare (alpha/alpha)(7) barrel fold. In addition to its apo form, we have also determined the structure of a metal-bound form of YePL2A (to 2.0A) and a trigalacturonic acid-bound substrate complex (to 2.1A) Although its fold is rare, the catalytic center of YePL2A can be superimposed with structurally unrelated families, underlining the conserved catalytic amino acid architecture of the beta-elimination mechanism. In addition to its overall structure, YePL2A also has two other unique features: 1) it utilizes a metal atom other than calcium for catalysis, and 2) its Brønstead base is in an alternate conformation and directly interacts with the uronate group of the substrate.
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Affiliation(s)
- D Wade Abbott
- Biochemistry & Microbiology, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
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35
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Chang VT, Crispin M, Aricescu AR, Harvey DJ, Nettleship JE, Fennelly JA, Yu C, Boles KS, Evans EJ, Stuart DI, Dwek RA, Jones EY, Owens RJ, Davis SJ. Glycoprotein structural genomics: solving the glycosylation problem. Structure 2007; 15:267-73. [PMID: 17355862 PMCID: PMC1885966 DOI: 10.1016/j.str.2007.01.011] [Citation(s) in RCA: 229] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2006] [Revised: 01/08/2007] [Accepted: 01/08/2007] [Indexed: 10/29/2022]
Abstract
Glycoproteins present special problems for structural genomic analysis because they often require glycosylation in order to fold correctly, whereas their chemical and conformational heterogeneity generally inhibits crystallization. We show that the "glycosylation problem" can be solved by expressing glycoproteins transiently in mammalian cells in the presence of the N-glycosylation processing inhibitors, kifunensine or swainsonine. This allows the correct folding of the glycoproteins, but leaves them sensitive to enzymes, such as endoglycosidase H, that reduce the N-glycans to single residues, enhancing crystallization. Since the scalability of transient mammalian expression is now comparable to that of bacterial systems, this approach should relieve one of the major bottlenecks in structural genomic analysis.
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Affiliation(s)
- Veronica T. Chang
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Max Crispin
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - A. Radu Aricescu
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - David J. Harvey
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - Joanne E. Nettleship
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Janet A. Fennelly
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Chao Yu
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Kent S. Boles
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - Edward J. Evans
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
| | - David I. Stuart
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Raymond A. Dwek
- Oxford Glycobiology Institute, Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, United Kingdom
| | - E. Yvonne Jones
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
| | - Raymond J. Owens
- Division of Structural Biology and Oxford Protein Production Facility, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom
- Corresponding author
| | - Simon J. Davis
- Nuffield Department of Clinical Medicine and MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, United Kingdom
- Corresponding author
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36
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Mulakala C, Nerinckx W, Reilly PJ. The fate of β-d-mannopyranose after its formation by endoplasmic reticulum α-(1→2)-mannosidase I catalysis. Carbohydr Res 2007; 342:163-9. [PMID: 17157281 DOI: 10.1016/j.carres.2006.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2006] [Revised: 10/26/2006] [Accepted: 11/07/2006] [Indexed: 11/21/2022]
Abstract
The automated docking program AutoDock was used to dock all 38 characteristic beta-D-mannopyranose ring conformers into the active site of the yeast endoplasmic reticulum alpha-(1-->2)-mannosidase I, a Family 47 glycoside hydrolase that converts Man9GlcNAc2 to Man8GlcNAc2. The subject of this work is to establish the conformational pathway that allows the cleaved glycon product to leave the enzyme active site and eventually reach the ground-state conformation. Twelve of the 38 conformers optimally dock in the active site where the inhibitors 1-deoxymannonojirimycin and kifunensine are found in enzyme crystal structures. A further 23 optimally dock in a second site on the side of the active-site well, while three dock outside the active-site cavity. It appears, through analysis of the internal energies of different ring conformations, of intermolecular energies between the ligands and enzyme, and of forces exerted on the ligands by the enzyme, that beta-D-mannopyranose follows the path 3E-->1C4-->1H2-->B2,5 before being expelled by the enzyme. The highly conserved second site that strongly binds beta-D-mannopyranose-4C1 may exist to prevent competitive inhibition by the product, and is worthy of further investigation.
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Affiliation(s)
- Chandrika Mulakala
- Department of Chemical and Biological Engineering, 2114 Sweeney Hall, Iowa State University, Ames, IA 50011, USA
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37
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Abstract
Glycosylation of asparagine residues in Asn-x-Ser/Thr motifs is a common covalent modification of proteins in the lumen of the endoplasmic reticulum (ER). By substantially contributing to the overall hydrophilicity of the polypeptide, pre-assembled core glycans inhibit possible aggregation caused by the inevitable exposure of hydrophobic patches on the as yet unstructured chains. Thereafter, N-glycans are modified by ER-resident enzymes glucosidase I (GI), glucosidase II (GII), UDP-glucose:glycoprotein glucosyltransferase (UGT) and mannosidase(s) and become functional appendices that determine the fate of the associated polypeptide. Recent work has improved our understanding of how the removal of terminal glucose residues from N-glycans allows newly synthesized proteins to access the calnexin chaperone system; how substrate retention in this specialized chaperone system is regulated by de-/re-glucosylation cycles catalyzed by GII and UGT1; and how acceleration of N-glycan dismantling upon induction of EDEM variants promotes ER-associated degradation (ERAD) under conditions of ER stress. In particular, characterization of cells lacking certain ER chaperones has revealed important new information on the mechanisms regulating protein folding and quality control. Tight regulation of N-glycan modifications is crucial to maintain protein quality control, to ensure the synthesis of functional polypeptides and to avoid constipation of the ER with folding-defective polypeptides.
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Affiliation(s)
- Lloyd W Ruddock
- Biocenter Oulu and Department of Biochemistry, University of Oulu, FIN-90014 Oulu, Finland
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38
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Tremblay LO, Nagy Kovács E, Daniels E, Wong NK, Sutton-Smith M, Morris HR, Dell A, Marcinkiewicz E, Seidah NG, McKerlie C, Herscovics A. Respiratory distress and neonatal lethality in mice lacking Golgi alpha1,2-mannosidase IB involved in N-glycan maturation. J Biol Chem 2006; 282:2558-66. [PMID: 17121831 DOI: 10.1074/jbc.m608661200] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
There are three mammalian Golgi alpha1,2-mannosidases, encoded by different genes, that form Man5GlcNAc2 from Man(8-9)GlcNAc2 for the biosynthesis of hybrid and complex N-glycans. Northern blot analysis and in situ hybridization indicate that the three paralogs display distinct developmental and tissue-specific expression. The physiological role of Golgi alpha1,2-mannosidase IB was investigated by targeted gene ablation. The null mice have normal gross appearance at birth, but they display respiratory distress and die within a few hours. Histology of fetal lungs the day before birth indicate some delay in development, whereas neonatal lungs show extensive pulmonary hemorrhage in the alveolar region. No significant histopathological changes occur in other tissues. No remarkable ultrastructural differences are detected between wild type and null lungs. The membranes of a subset of bronchiolar epithelial cells are stained with lectins from Phaseolus vulgaris (leukoagglutinin and erythroagglutinin) and Datura stramonium in wild type lungs, but this staining disappears in lungs from null mice. Mass spectrometry of N-glycans from different tissues shows no significant changes in global N-glycans of null mice. Therefore, only a few glycoproteins required for normal lung function depend on alpha1,2-mannosidase IB for maturation. There are no apparent differences in the expression of several lung epithelial cell and endothelial cell markers between null and wild type mice. The alpha1,2-mannosidase IB null phenotype differs from phenotypes caused by ablation of other enzymes in N-glycan biosynthesis and from other mouse gene disruptions that affect pulmonary development and function.
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Affiliation(s)
- Linda O Tremblay
- McGill Cancer Centre, McGill University, Montréal, Québec, Canada
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39
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Olivari S, Cali T, Salo KEH, Paganetti P, Ruddock LW, Molinari M. EDEM1 regulates ER-associated degradation by accelerating de-mannosylation of folding-defective polypeptides and by inhibiting their covalent aggregation. Biochem Biophys Res Commun 2006; 349:1278-84. [PMID: 16987498 DOI: 10.1016/j.bbrc.2006.08.186] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2006] [Accepted: 08/28/2006] [Indexed: 11/28/2022]
Abstract
Proteins expressed in the endoplasmic reticulum (ER) are covalently modified by co-translational addition of pre-assembled core glycans (glucose(3)-mannose(9)-N-acetylglucosamine(2)) to asparagines in Asn-X-Ser/Thr motifs. N-Glycan processing is essential for protein quality control in the ER. Cleavages and re-additions of the innermost glucose residue prolong folding attempts in the calnexin cycle. Progressive loss of mannoses is a symptom of long retention in the ER and elicits preparation of terminally misfolded polypeptides for dislocation into the cytosol and proteasome-mediated degradation. The ER stress-induced protein EDEM1 regulates disposal of folding-defective glycoproteins and has been described as a mannose-binding lectin. Here we show that elevation of the intralumenal concentration of EDEM1 accelerates ER-associated degradation (ERAD) by accelerating de-mannosylation of terminally misfolded glycoproteins and by inhibiting formation of covalent aggregates upon release of terminally misfolded ERAD candidates from calnexin. Acceleration of Man(9) or Man(5)N-glycans dismantling upon overexpression was fully blocked by substitution in EDEM1 of one catalytic residue conserved amongst alpha1,2-mannosidases, thus suggesting that EDEM1 is an active mannosidase. This mutation did not affect the chaperone function of EDEM1.
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Affiliation(s)
- Silvia Olivari
- Institute for Research in Biomedicine, CH-6500 Bellinzona, Switzerland
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40
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Moremen KW, Molinari M. N-linked glycan recognition and processing: the molecular basis of endoplasmic reticulum quality control. Curr Opin Struct Biol 2006; 16:592-9. [PMID: 16938451 PMCID: PMC3976202 DOI: 10.1016/j.sbi.2006.08.005] [Citation(s) in RCA: 101] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2006] [Revised: 07/04/2006] [Accepted: 08/16/2006] [Indexed: 12/30/2022]
Abstract
Nascent polypeptides emerging into the lumen of the endoplasmic reticulum (ER) are N-glycosylated on asparagines in Asn-Xxx-Ser/Thr motifs. Processing of the core oligosaccharide eventually determines the fate of the associated polypeptide by regulating entry into and retention by the calnexin chaperone system, or extraction from the ER folding environment for disposal. Recent advances have shown that at least two N-glycans are necessary for protein access to the calnexin chaperone system and that polypeptide cycling in the system is a rather rare event, which, for folding-defective polypeptides, is activated only upon persistent misfolding. Additionally, dismantling of the polypeptide-bound N-glycan interrupts futile folding attempts, and elicits preparation of the misfolded chain for dislocation into the cytosol and degradation.
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Affiliation(s)
- Kelley W Moremen
- Complex Carbohydrate Research Center, University of Georgia, Athens, GA 30602-4712, USA
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41
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Hirao K, Natsuka Y, Tamura T, Wada I, Morito D, Natsuka S, Romero P, Sleno B, Tremblay LO, Herscovics A, Nagata K, Hosokawa N. EDEM3, a soluble EDEM homolog, enhances glycoprotein endoplasmic reticulum-associated degradation and mannose trimming. J Biol Chem 2006; 281:9650-8. [PMID: 16431915 DOI: 10.1074/jbc.m512191200] [Citation(s) in RCA: 198] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Quality control in the endoplasmic reticulum ensures that only properly folded proteins are retained in the cell through mechanisms that recognize and discard misfolded or unassembled proteins in a process called endoplasmic reticulum-associated degradation (ERAD). We previously cloned EDEM (ER degradation-enhancing alpha-mannosidase-like protein) and showed that it accelerates ERAD of misfolded glycoproteins. We now cloned mouse EDEM3, a soluble homolog of EDEM. EDEM3 consists of 931 amino acids and has all the signature motifs of Class I alpha-mannosidases (glycosyl hydrolase family 47) in its N-terminal domain and a protease-associated motif in its C-terminal region. EDEM3 accelerates glycoprotein ERAD in transfected HEK293 cells, as shown by increased degradation of misfolded alpha1-antitrypsin variant (null (Hong Kong)) and of TCRalpha. Overexpression of EDEM3 also greatly stimulates mannose trimming not only from misfolded alpha1-AT null (Hong Kong) but also from total glycoproteins, in contrast to EDEM, which has no apparent alpha1,2-mannosidase activity. Furthermore, overexpression of the E147Q EDEM3 mutant, which has the mutation in one of the conserved acidic residues essential for enzyme activity of alpha1,2-mannosidases, abolishes the stimulation of mannose trimming and greatly decreases the stimulation of ERAD by EDEM3. These results show that EDEM3 has alpha1,2-mannosidase activity in vivo, suggesting that the mechanism whereby EDEM3 accelerates glycoprotein ERAD is different from that of EDEM.
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Affiliation(s)
- Kazuyoshi Hirao
- Department of Molecular and Cellular Biology, Institute for Frontier Medical Sciences, Kyoto University, Kyoto 606-8397, Japan, CREST, JST, Saitama 332-0012, Japan
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42
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Abstract
Alpha-mannosidases in eukaryotic cells are involved in both glycan biosynthetic reactions and glycan catabolism. Two broad families of enzymes have been identified that cleave terminal mannose linkages from Asn-linked oligosaccharides (Moremen, 2000), including the Class 1 mannosidases (CAZy GH family 47 (Henrissat and Bairoch, 1996)) of the early secretory pathway involved in the processing of N-glycans and quality control and the Class 2 mannosidases (CAZy family GH38 [Henrissat and Bairoch, 1996]) involved in glycoprotein biosynthesis or catabolism. Within the Class 1 family of alpha-mannosidases, three subfamilies of enzymes have been identified (Moremen, 2000). The endoplasmic reticulum (ER) alpha1,2-mannosidase I (ERManI) subfamily acts to cleave a single residue from Asn-linked glycans in the ER. The Golgi alpha-mannosidase I (GolgiManI) subfamily has at least three members in mammalian systems (Herscovics et al., 1994; Lal et al., 1994; Tremblay and Herscovics, 2000) involved in glycan maturation in the Golgi complex to form the Man(5)GlcNAc(2) processing intermediate. The third subfamily of GH47 proteins comprises the ER degradation, enhancing alpha-mannosidase-like proteins (EDEM proteins) (Helenius and Aebi, 2004; Hirao et al., 2006; Mast et al., 2005). These proteins have been proposed to accelerate the degradation of misfolded proteins in the lumen of the ER by a lectin function that leads to retrotranslocation to the cytosol and proteasomal degradation. Recent studies have also indicated that ERManI acts as a timer for initiation of glycoprotein degradation via the ubiquitin-proteasome pathway (Hosokawa et al., 2003; Wu et al., 2003). This article discusses methods for analysis of the GH47 alpha-mannosidases, including expression, purification, activity assays, generation of point mutants, and binding studies by surface plasmon resonance.
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Affiliation(s)
- Steven W Mast
- Department of Biochemistry & Molecular Biology, University of Georgia Complex Carbohydrate Research Center, Athens, GA, USA
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43
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Hossler P, Goh LT, Lee MM, Hu WS. GlycoVis: Visualizing glycan distribution in the proteinN-glycosylation pathway in mammalian cells. Biotechnol Bioeng 2006; 95:946-60. [PMID: 16807922 DOI: 10.1002/bit.21062] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Glycosylation has profound effects on the quality of recombinant proteins produced in mammalian cells. The biosynthetic pathways of N-linked glycans on glycoproteins involves a relatively small number of enzymes and nucleotide sugars. Many of these glycoconjugate enzymes can utilize multiple N-glycans as substrates, thus generating a large number of glycan intermediates, and making the biosynthetic pathway resemble a network with diverging and converging paths. The N-glycans on secreted glycoprotein molecules include not only terminal glycans, but also pathway intermediates. To better assess the glycan distribution and the potential route of their synthesis, we created GlycoVis, a visualization program that displays the distribution and the potential reaction paths leading to each N-glycan on the reaction network. The substrate specificities of the enzymes involved were organized into a relationship matrix. With the input of glycan distribution data, the program outputs a reaction pathway map which labels the relative abundance levels of different glycans with different colors. The program also traces all possible reaction paths leading to each glycan and identifies each pathway on the map. Glycoform distribution of Chinese Hamster Ovary cell-derived tissue plasminogen activator (TPA), and human and mouse IgG were used as illustrations for the application of GlycoVis. In addition, the intracellular and secreted IgG from an NS0 producer cell line were isolated, and their glycoform profiles were displayed using GlycoVis for comparison. This visualization tool facilitates the analysis of potential reaction paths utilized under different physiological or culture conditions, and may provide insight on the potential targets for metabolic engineering.
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Affiliation(s)
- Patrick Hossler
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455-0132, USA
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44
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Hering KW, Karaveg K, Moremen KW, Pearson WH. A Practical Synthesis of Kifunensine Analogues as Inhibitors of Endoplasmic Reticulum α-Mannosidase I. J Org Chem 2005; 70:9892-904. [PMID: 16292820 DOI: 10.1021/jo0516382] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] A practical synthesis of the potent class I alpha-mannosidase inhibitor kifunensine (1) beginning from the inexpensive and readily available starting material L-ascorbic acid (15) is described. The protected amino-alcohol ((2R,3R,4R,5R)-5-amino-2,3:4,6-diisopropylidenedioxyhexanol, 11) served as a key intermediate from which several N-1 substituted kifunensine analogues (including N-methyl, N-cyclohexyl, and N-bis(hydroxymethyl)methyl) and 2-desoxakifunensine analogues (including N-H and N-methyl) were prepared and screened for inhibition of human endoplasmic reticulum alpha-mannosidase I (ER Man I) and mouse Golgi alpha-mannosidase IA (Golgi Man IA). In addition, several pseudodisaccharide kifunensine analogues in which a mannose residue was tethered to N-1 of kifunensine via a two-, three-, or four-carbon linker and an affinity-bound kifunensine analogue were also prepared and evaluated for biological activity. While the synthesized N-1 kifunesine analogues were found to be less potent inhibitors of Class I alpha-mannosidases than kifuensine itself, the bis(hydroxymethyl)methylkifunensine analogue 6 was shown to selectively inhibit ER Man I over Golgi Man IA.
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Affiliation(s)
- Kirk W Hering
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA
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Karaveg K, Moremen KW. Energetics of Substrate Binding and Catalysis by Class 1 (Glycosylhydrolase Family 47) α-Mannosidases Involved in N-Glycan Processing and Endoplasmic Reticulum Quality Control. J Biol Chem 2005; 280:29837-48. [PMID: 15911611 DOI: 10.1074/jbc.m505130200] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nascent glycoproteins are subject to quality control in the lumen of the endoplasmic reticulum (ER) where they can either be effectively folded with the aid of a collection of ER chaperones or they can be targeted for disposal in a process known as ER-associated degradation. Initiation of the ER disposal process involves selective trimming of N-glycans by ER alpha-mannosidase I and subsequent recognition by the ER degradation-enhancing alpha-mannosidase-like protein family of lectins, both members of glycosylhydrolase family 47. The kinetics and energetics of substrate binding and catalysis by members of this family were investigated here by the analysis of wild type and mutant forms of human ER alpha-mannosidase I. The contributions of several amino acid residues and an enzyme-associated Ca(2+) ion to substrate binding and catalysis were demonstrated by a combination of surface plasmon resonance and enzyme kinetic analyses. One mutant, E330Q, shown previously to alter general acid function within the catalytic site, resulted in an enzyme that possessed increased glycan binding affinity but compromised glycan hydrolysis. This mutant protein was used in a series of glycan binding studies with a library of mannose-containing ligands to examine the energetics of Man(9)GlcNAc(2) substrate interactions. These studies provide a framework for understanding the nature of the unusual substrate interactions within the family 47 mannosidases involved in glycan maturation and ER-associated glycoprotein degradation.
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Affiliation(s)
- Khanita Karaveg
- Complex Carbohydrate Research Center and the Department of Biochemistry and Molecular Biology, University of Georgia, Athens, 30602, USA
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Karaveg K, Siriwardena A, Tempel W, Liu ZJ, Glushka J, Wang BC, Moremen KW. Mechanism of Class 1 (Glycosylhydrolase Family 47) α-Mannosidases Involved in N-Glycan Processing and Endoplasmic Reticulum Quality Control. J Biol Chem 2005; 280:16197-207. [PMID: 15713668 DOI: 10.1074/jbc.m500119200] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Quality control in the endoplasmic reticulum (ER) determines the fate of newly synthesized glycoproteins toward either correct folding or disposal by ER-associated degradation. Initiation of the disposal process involves selective trimming of N-glycans attached to misfolded glycoproteins by ER alpha-mannosidase I and subsequent recognition by the ER degradation-enhancing alpha-mannosidase-like protein family of lectins, both members of glycosylhydrolase family 47. The unusual inverting hydrolytic mechanism catalyzed by members of this family is investigated here by a combination of kinetic and binding analyses of wild type and mutant forms of human ER alpha-mannosidase I as well as by structural analysis of a co-complex with an uncleaved thiodisaccharide substrate analog. These data reveal the roles of potential catalytic acid and base residues and the identification of a novel (3)S(1) sugar conformation for the bound substrate analog. The co-crystal structure described here, in combination with the (1)C(4) conformation of a previously identified co-complex with the glycone mimic, 1-deoxymannojirimycin, indicates that glycoside bond cleavage proceeds through a least motion conformational twist of a properly predisposed substrate in the -1 subsite. A novel (3)H(4) conformation is proposed as the exploded transition state.
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Affiliation(s)
- Khanita Karaveg
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602, USA
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