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Lv Y, Zhang Z, Wang M, Wang Y, Chen M, Jia J, Guo Y, Wang K, Li Z, Wang W, Li H. Discovery of novel FUT8 inhibitors with promising affinity and in vivo efficacy for colorectal cancer therapy. Bioorg Chem 2024; 149:107492. [PMID: 38820939 DOI: 10.1016/j.bioorg.2024.107492] [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: 03/26/2024] [Revised: 05/07/2024] [Accepted: 05/22/2024] [Indexed: 06/02/2024]
Abstract
As a member of glycosyltransferases, fucosyltransferase 8 (FUT8) is essential to core fucosylation and has been considered as a potential therapeutic target for malignant tumors, including colorectal cancer (CRC). Based on the identification of key binding residues and probable conformation of FUT8, an integrated strategy that combines virtual screening and chemical optimization was carried out and compound 15 was identified as a potent FUT8 inhibitor with novel chemical structure and in vitro antitumor activity. Moreover, chemical pulldown experiments and binding assays confirmed that compound 15 selectively bound to FUT8. In vivo, compound 15 showed promising anti-CRC effects in SW480 xenografts. These data support that compound 15 is a potential FUT8 inhibitor for CRC treatment and deserve further optimization studies.
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Affiliation(s)
- Yixin Lv
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Zhoudong Zhang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Mengmeng Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China; Department of Pharmacy, The Second Affiliated Hospital of Soochow University, Soochow University, Suzhou 215123, China
| | - Yiyun Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Mengxi Chen
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Jie Jia
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Yueyue Guo
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Kai Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Zhi Li
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China
| | - Weipeng Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China.
| | - Huanqiu Li
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215123, China.
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2
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Lv Y, Zhang Z, Tian S, Wang W, Li H. Therapeutic potential of fucosyltransferases in cancer and recent development of targeted inhibitors. Drug Discov Today 2023; 28:103394. [PMID: 36223858 DOI: 10.1016/j.drudis.2022.103394] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 09/05/2022] [Accepted: 10/04/2022] [Indexed: 11/05/2022]
Abstract
Fucosyltransferases (FUTs) have significant roles in various pathophysiological events. Their high expression is a signature of malignant cell transformation, contributing to many abnormal events during cancer development, such as uncontrolled cell proliferation, tumor cell invasion, angiogenesis, metastasis, immune evasion, and therapy resistance. Therefore, FUTs have evolved as an attractive therapeutic target for treating solid cancers, and many substrate analogs have been discovered with potential as FUT inhibitors for cancer therapy. Meanwhile, the development of FUT protein structures represents a significant advance in the design of FUT inhibitors with nonsubstrate structures. In this review, we summarize the role of FUTs in cancers, the resolved protein crystal structures and progress in the development of FUT inhibitors as cancer therapeutics.
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Affiliation(s)
- Yixin Lv
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215006, Jiangsu, China
| | - Zhoudong Zhang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215006, Jiangsu, China
| | - Sheng Tian
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215006, Jiangsu, China
| | - Weipeng Wang
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215006, Jiangsu, China.
| | - Huanqiu Li
- College of Pharmaceutical Sciences, Soochow University, Suzhou 215006, Jiangsu, China.
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3
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Strecker C, Baerenfaenger M, Miehe M, Spillner E, Meyer B. In Silico Evaluation of the Binding Site of Fucosyltransferase 8 and First Attempts to Synthesize an Inhibitor with Drug-Like Properties. Chembiochem 2020; 21:1923-1931. [PMID: 31194280 DOI: 10.1002/cbic.201900289] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Indexed: 12/15/2022]
Abstract
Core fucosylation of N-glycans is catalyzed by fucosyltransferase 8 and is associated with various types of cancer. Most reported fucosyltransferase inhibitors contain non-drug-like features, such as charged groups. New starting points for the development of inhibitors of fucosyltransferase 8 using a fragment-based strategy are presented. Firstly, we discuss the potential of a new putative binding site of fucosyltransferase 8 that, according to a molecular dynamics (MD) simulation, is made accessible by a significant motion of the SH3 domain. This might enable the design of completely new inhibitor types for fucosyltransferase 8. Secondly, we have performed a docking study targeting the donor binding site of fucosyltransferase 8, and this yielded two fragments that were linked and trimmed in silico. The resulting ligand was synthesized. Saturation transfer difference (STD) NMR confirmed binding of the ligand featuring a pyrazole core that mimics the guanine moiety. This ligand represents the first low-molecular-weight compound for the development of inhibitors of fucosyltransferase 8 with drug-like properties.
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Affiliation(s)
- Claas Strecker
- Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - Melissa Baerenfaenger
- Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany.,Present address: Department of Neurology, Radboud University Medical Center, Geert Grooteplein 10, Nijmegen, 6525, GA, The Netherlands
| | - Michaela Miehe
- Department of Engineering, Aarhus University, Gustav Wieds Vej 10, 8000, Aarhus, Denmark
| | - Edzard Spillner
- Department of Engineering, Aarhus University, Gustav Wieds Vej 10, 8000, Aarhus, Denmark
| | - Bernd Meyer
- Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
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4
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Ehret J, Zimmermann M, Eichhorn T, Zimmer A. Impact of cell culture media additives on IgG glycosylation produced in Chinese hamster ovary cells. Biotechnol Bioeng 2019; 116:816-830. [PMID: 30552760 PMCID: PMC6590254 DOI: 10.1002/bit.26904] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 11/12/2018] [Accepted: 12/14/2018] [Indexed: 01/07/2023]
Abstract
Glycosylation is a key critical quality attribute for monoclonal antibodies and other recombinant proteins because of its impact on effector mechanisms and half‐life. In this study, a variety of compounds were evaluated for their ability to modulate glycosylation profiles of recombinant monoclonal antibodies produced in Chinese hamster ovary cells. Compounds were supplemented into the cell culture feed of fed‐batch experiments performed with a CHO K1 and a CHO DG44 cell line expressing a recombinant immunoglobulin G1 (IgG1). Experiments were performed in spin tubes or the ambr®15 controlled bioreactor system, and the impact of the compounds at various concentrations was determined by monitoring the glycosylation profile of the IgG and cell culture parameters, such as viable cell density, viability, and titer. Results indicate that the highest impact on mannosylation was achieved through 15 µM kifunensine supplementation leading to an 85.8% increase in high‐mannose containing species. Fucosylation was reduced by 76.1% through addition of 800 µM 2‐F‐peracetyl fucose. An increase of 40.9% in galactosylated species was achieved through the addition of 120 mM galactose in combination with 48 µM manganese and 24 µM uridine. Furthermore, 6.9% increased sialylation was detected through the addition of 30 µM dexamethasone in combination with the same manganese, uridine, and galactose mixture used to increase total galactosylation. Further compounds or combinations of additives were also efficient at achieving a smaller overall glycosylation modulation, required, for instance, during the development of biosimilars. To the best of our knowledge, no evaluation of the efficacy of such a variety of compounds in the same cell culture system has been described. The studied cell culture media additives are efficient modulators of glycosylation and are thus a valuable tool to produce recombinant glycoproteins.
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Affiliation(s)
- Janike Ehret
- Merck Life Sciences, Upstream R&D, Darmstadt, Germany
| | - Martina Zimmermann
- Merck Life Sciences, Upstream R&D, Darmstadt, Germany.,Institute for Organic Chemistry and Biochemistry, Technische Universität Darmstadt, Darmstadt, Germany
| | | | - Aline Zimmer
- Merck Life Sciences, Upstream R&D, Darmstadt, Germany
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5
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Brühlmann D, Jordan M, Hemberger J, Sauer M, Stettler M, Broly H. Tailoring recombinant protein quality by rational media design. Biotechnol Prog 2015; 31:615-29. [DOI: 10.1002/btpr.2089] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 03/04/2015] [Indexed: 02/07/2023]
Affiliation(s)
- David Brühlmann
- Merck Serono SA, Corsier-sur-Vevey, Biotech Process Sciences, Zone Industrielle B; CH-1809 Fenil-sur-Corsier Switzerland
- Dept. of Biotechnology and Biophysics; Julius-Maximilians-Universität Würzburg, Biozentrum; Am Hubland DE-97074 Würzburg Germany
| | - Martin Jordan
- Merck Serono SA, Corsier-sur-Vevey, Biotech Process Sciences, Zone Industrielle B; CH-1809 Fenil-sur-Corsier Switzerland
| | - Jürgen Hemberger
- Inst. for Biochemical Engineering and Analytics; University of Applied Sciences Giessen; Wiesenstrasse 14, DE-35390 Giessen Germany
| | - Markus Sauer
- Dept. of Biotechnology and Biophysics; Julius-Maximilians-Universität Würzburg, Biozentrum; Am Hubland DE-97074 Würzburg Germany
| | - Matthieu Stettler
- Merck Serono SA, Corsier-sur-Vevey, Biotech Process Sciences, Zone Industrielle B; CH-1809 Fenil-sur-Corsier Switzerland
| | - Hervé Broly
- Merck Serono SA, Corsier-sur-Vevey, Biotech Process Sciences, Zone Industrielle B; CH-1809 Fenil-sur-Corsier Switzerland
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6
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One-step purification of phosphinothricin acetyltransferase using reactive dye-affinity chromatography. Methods Mol Biol 2015; 1286:35-42. [PMID: 25749943 DOI: 10.1007/978-1-4939-2447-9_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Reactive dye purification is an affinity purification technique offering unique selectivity and high purification potential. Historically, purification of phosphinothricin acetyltransferase (PAT) has involved several steps of precipitation and column chromatography. Here, we describe a novel purification method that is simple, time-saving, inexpensive, and reproducible. The novel method employs a single chromatography step using a reactive dye resin, Reactive brown 10-agarose. Reactive brown 10 preferentially binds the PAT protein, which can then be specifically released by one of its substrates, acetyl-CoA. Using Reactive brown 10-agarose, PAT protein can be purified to homogeneity from E. coli or plant tissue with high recovery efficiency.
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7
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Tedaldi L, Wagner GK. Beyond substrate analogues: new inhibitor chemotypes for glycosyltransferases. MEDCHEMCOMM 2014. [DOI: 10.1039/c4md00086b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
New inhibitor chemotypes for glycosyltransferases, which are not structurally derived from either donor or acceptor substrate, are being reviewed.
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Affiliation(s)
- Lauren Tedaldi
- Institute of Pharmaceutical Science
- School of Biomedical Sciences
- King's College London
- London
- UK
| | - Gerd K. Wagner
- Institute of Pharmaceutical Science
- School of Biomedical Sciences
- King's College London
- London
- UK
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8
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Purification of phosphinothricin acetyltransferase using Reactive brown 10 affinity in a single chromatography step. Protein Expr Purif 2013; 90:129-34. [DOI: 10.1016/j.pep.2013.05.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2013] [Revised: 05/22/2013] [Accepted: 05/23/2013] [Indexed: 11/20/2022]
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9
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Tu Z, Lin YN, Lin CH. Development of fucosyltransferase and fucosidase inhibitors. Chem Soc Rev 2013; 42:4459-75. [PMID: 23588106 DOI: 10.1039/c3cs60056d] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
L-Fucose-containing glycoconjugates are essential for a myriad of physiological and pathological activities, such as inflammation, bacterial and viral infections, tumor metastasis, and genetic disorders. Fucosyltransferases and fucosidases, the main enzymes involved in the incorporation and cleavage of L-fucose residues, respectively, represent captivating targets for therapeutic treatment and diagnosis. We herein review the important breakthroughs in the development of fucosyltransferase and fucosidase inhibitors. To demonstrate how the synthesized small molecules interact with the target enzymes, i.e. delineation of the structure-activity relationship, we cover the reaction mechanisms and resolved X-ray crystal structures, discuss how this information guides the design of enzyme inhibitors, and explain how the molecules were optimized to achieve satisfying potency and selectivity.
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Affiliation(s)
- Zhijay Tu
- Institute of Biological Chemistry and Genomics Research Center, Academia Sinica, No.128 Academia Road Section 2, Nan-Kang, Taipei, 11529, Taiwan
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10
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Grzyb J, Malec P, Rumak I, Garstka M, Strzałka K. Two isoforms of ferredoxin:NADP(+) oxidoreductase from wheat leaves: purification and initial biochemical characterization. PHOTOSYNTHESIS RESEARCH 2008; 96:99-112. [PMID: 18253859 DOI: 10.1007/s11120-008-9289-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2007] [Accepted: 01/17/2008] [Indexed: 05/25/2023]
Abstract
Ferredoxin:NADP(+) oxidoreductase is an enzyme associated with the stromal side of the thylakoid membrane in the chloroplast. It is involved in photosynthetic linear electron transport to produce NADPH and is supposed to play a role in cyclic electron transfer, generating a transmembrane pH gradient allowing ATP production, if photosystem II is non-functional or no NADP(+) is available for reduction. Different FNR isoforms have been described in non-photosynthetic tissues, where the enzyme catalyses the NADPH-dependent reduction of ferredoxin (Fd), necessary for some biosynthetic pathways. Here, we report the isolation and purification of two FNR isoproteins from wheat leaves, called FNR-A and FNR-B. These forms of the enzyme were identified as products of two different genes, as confirmed by mass spectrometry. The molecular masses of FNR-A and FNR-B were 34.3 kDa and 35.5 kDa, respectively. The isoelectric point of both FNR-A and FNR-B was about 5, but FNR-B appeared more acidic (of about 0.2 pH unit) than FNR-A. Both isoenzymes were able to catalyse a NADPH-dependent reduction of dibromothymoquinone and the mixture of isoforms catalysed reduction of cytochrome c in the presence of Fd. For the first time, the pH- and ionic strength dependent oligomerization of FNRs is observed. No other protein was necessary for complex formation. The putative role of the two FNR isoforms in photosynthesis is discussed based on current knowledge of electron transport in chloroplasts.
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Affiliation(s)
- Joanna Grzyb
- Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, ul. Gronostajowa 7, 30-387 Kraków, Poland
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11
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Oguchi Y, Masada S, Kondo T, Terasaka K, Mizukami H. Purification and characterization of UDP-glucose : curcumin glucoside 1,6-glucosyltransferase from Catharanthus roseus cell suspension cultures. PLANT & CELL PHYSIOLOGY 2007; 48:1635-1643. [PMID: 17940060 DOI: 10.1093/pcp/pcm138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Catharanthus roseus cell suspension cultures converted exogenously added curcumin to a series of curcumin glucosides that possessed drastically enhanced water solubility. A cDNA clone encoding a glucosyltransferase responsible for glucosylation of curcumin to form curcumin 4'-O-glucoside was previously isolated, and in the present study a novel sugar-sugar glycosyltransferase, UDP-glucose:curcumin glucoside glucosyltransferase (UCGGT), was purified approximately 900-fold to apparent homogeneity from cultured cells of C. roseus. The purified enzyme (0.2% activity yield) catalyzed 1,6-glucosylation of curcumin 4'-O-glucoside to yield curcumin 4'-O-gentiobioside. The molecular weight and isoelectric point were estimated to be about 50 kDa and 5.2, respectively. The enzyme showed a pH optimum between 7.5 and 7.8. Both flavonoid 3-O- and 7-O-glucosides were also preferred acceptor substrates of the enzyme, whereas little activity was shown toward simple phenolic glucosides such as arbutin and glucovanillin, cyanogenic glucoside (prunasin) or flavonoid galactoside. These results suggest that UCGGT may also function in the biosynthesis of flavonoid glycosides in planta.
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Affiliation(s)
- Yukie Oguchi
- Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, 467-8603 Japan
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12
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Lin DQ, Yao SJ. Optimizing Dye-Ligand Density with Molecular Analysis for Affinity Chromatography of Rabbit Muscle l-Lactate Dehydrogenase. Biotechnol Prog 2007. [DOI: 10.1002/bp070124g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Abstract
Fucosylated carbohydrate structures are involved in a variety of biological and pathological processes in eukaryotic organisms including tissue development, angiogenesis, fertilization, cell adhesion, inflammation, and tumor metastasis. In contrast, fucosylation appears less common in prokaryotic organisms and has been suggested to be involved in molecular mimicry, adhesion, colonization, and modulating the host immune response. Fucosyltransferases (FucTs), present in both eukaryotic and prokaryotic organisms, are the enzymes responsible for the catalysis of fucose transfer from donor guanosine-diphosphate fucose to various acceptor molecules including oligosaccharides, glycoproteins, and glycolipids. To date, several subfamilies of mammalian FucTs have been well characterized; these enzymes are therefore delineated and used as models. Non-mammalian FucTs that possess different domain construction or display distinctive acceptor substrate specificity are highlighted. It is noteworthy that the glycoconjugates from plants and schistosomes contain some unusual fucose linkages, suggesting the presence of novel FucT subfamilies as yet to be characterized. Despite the very low sequence homology, striking functional similarity is exhibited between mammalian and Helicobacter pylori alpha1,3/4 FucTs, implying that these enzymes likely share a conserved mechanistic and structural basis for fucose transfer; such conserved functional features might also exist when comparing other FucT subfamilies from different origins. Fucosyltranferases are promising tools used in synthesis of fucosylated oligosaccharides and glycoconjugates, which show great potential in the treatment of infectious and inflammatory diseases and tumor metastasis.
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Affiliation(s)
- Bing Ma
- Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
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Khaled A, Ivannikova T, Augé C. Synthesis of unnatural sugar nucleotides and their evaluation as donor substrates in glycosyltransferase-catalyzed reactions. Carbohydr Res 2005; 339:2641-9. [PMID: 15519322 DOI: 10.1016/j.carres.2004.09.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2004] [Accepted: 09/01/2004] [Indexed: 10/26/2022]
Abstract
New unnatural sugar nucleotides, UDP-Fuc and CDP-Fuc were synthesized from fucose-beta-1-phosphate and nucleotide monophosphates activated as morpholidates. Furthermore, a nucleotide analogue was prepared by phosphorylation of 1-(beta-D-ribofuranosyl)cyanuric acid, itself obtained as a protected derivative by condensation of the persilylated derivative of cyanuric acid with 1-O-acetyl-2,3,5-tri-O-benzoyl-beta-D-ribofuranose in 74% yield. This phosphate activated according to the same procedure was condensed with fucose-beta-1-phosphate, affording a new sugar nucleotide conjugate (NDP-Fuc) which was evaluated together with UDP-Fuc, CDP-Fuc and ADP-Fuc, as fucose donors in alpha-(1-->4/3)-fucosyltransferase (FucT-III) catalyzed reaction. Fucose transfer could be observed with each of the donors and kinetic parameters were determined using a fluorescent acceptor substrate. Efficiency of the four analogues towards FucT-III was in the following order: UDP-Fuc=ADP-Fuc>NDP-Fuc>CDP-Fuc. According to the same strategy ADP-GlcNAc was prepared from AMP-morpholidate and N-acetylglucosamine-alpha-1-phosphate; tested as a glucosaminyl donor towards Neisseria meningitidis N-acetylglucosaminyl transferase (LgtA), ADP-GlcNAc was recognized with 0.1% efficiency as compared with UDP-GlcNAc, the natural donor substrate.
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Affiliation(s)
- Amira Khaled
- Laboratoire de Chimie Organique Multifonctionnelle, UMR 8614, GDR 2590, Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), Université Paris-Sud, Bât 420, F-91405 Orsay, France
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15
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Bastida A, Latorre M, García-Junceda E. In vivo chaperone-assisted folding of alpha-1,6-fucosyltransferase from Rhizobium sp. Chembiochem 2003; 4:531-3. [PMID: 12794864 DOI: 10.1002/cbic.200200514] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Agatha Bastida
- Departamento de Química Orgánica Biológica Instituto de Química Orgánica General CSIC, C/Juan de la Cierva 3, Madrid 28006, Spain
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Kamińska J, Wiśniewska A, Kościelak J. Chemical modifications of alpha1,6-fucosyltransferase define amino acid residues of catalytic importance. Biochimie 2003; 85:303-10. [PMID: 12770769 DOI: 10.1016/s0300-9084(03)00074-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
alpha1,6-Fucosyltransferase (alpha6FucT) of human platelets was subjected to the action of phenylglyoxal (PLG), pyridoxal-5'-phosphate/NaBH(4) (PLP), and diethyl pyrocarbonate (DEPC) the reagents that selectively modify the structure of amino acids arginine, lysine and histidine, respectively, as well as to N-ethylmaleimide (NEM), mersalyl, p-chloromercuribenzoate (pCMB), iodoacetate, iodoacetamide, and methyl iodide that react with sulfhydryl group of cysteine. In addition, we treated the enzyme with beta-mercaptoethanol, a reagent that disrupts disulfide bonds. All reagents except NEM significantly inactivated alpha6FucT. Protection against the action of PLG, PLP and sulfhydryl modifying reagents was offered by GDP-fucose, GDP, and the acceptor substrate, a transferrin-derived biantennary glycopeptide with terminal GlcNAc residues. Neither donor nor acceptor substrate offered, however, any protection against inactivation by DEPC or beta-mercaptoethanol. We conclude that arginine, cysteine and probably lysine residues are present in, or closely by, the donor and acceptor substrate binding domains of the enzyme, whereas histidine may be a part of its catalytic domain. However, the primary structure of alpha6FucT does not show cysteine residues in proximity to the postulated GDP-fucose-binding site and acceptor substrate binding site of the enzyme that contains two neighboring arginine residues and one lysine residue (Glycobiol. 10 (2000) 503). To rationalize our results we postulate that platelet alpha6FucT is folded through disulfide bonds that bring together donor/acceptor-binding- and cysteine- and lysine-rich, presumably acceptor substrate binding sites, thus creating a catalytic center of the enzyme.
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Affiliation(s)
- J Kamińska
- Department of Biochemistry, Institute of Hematology and Blood Transfusion, Chocimska 5, 00-957 Warsaw, Poland
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17
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Clarke W, Hage DS. Clinical Applications of Affinity Chromatography. SEPARATION AND PURIFICATION REVIEWS 2003. [DOI: 10.1081/spm-120025025] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Abstract
Dye-ligands have been considered as one of the important alternatives to natural counterparts for specific affinity chromatography. Dye-ligands are able to bind most types of proteins, in some cases in a remarkably specific manner. They are commercially available, inexpensive, and can easily be immobilized, especially on matrices bearing hydroxyl groups. Although dyes are all synthetic in nature, they are still classified as affinity ligands because they interact with the active sites of many proteins mimicking the structure of the substrates, cofactors, or binding agents for those proteins. A number of textile dyes, known as reactive dyes, have been used for protein purification. Most of these reactive dyes consist of a chromophore (either azo dyes, anthraquinone, or phathalocyanine), linked to a reactive group (often a mono- or dichlorotriazine ring). The interaction between the dye ligand and proteins can be by complex combination of electrostatic, hydrophobic, hydrogen bonding. Selection of the supporting matrix is the first important consideration in dye-affinity systems. There are several methods for immobilization of dye molecules onto the support matrix, in which usually several intermediate steps are followed. Both the adsorption and elution steps should carefully be optimized/designed for a successful separation. Dye-affinity systems in the form of spherical sorbents or as affinity membranes have been used in protein separation.
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Affiliation(s)
- A Denizli
- Biochemistry Division, Department of Chemistry, Hacettepe University, 06532 Beytepe, Ankara, Turkey
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