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This report highlights recent advances relevant to two complementary glycorandomization strategies. Chemoenzymatic glycorandomization is a biocatalytic approach dependent upon the substrate promiscuity of enzymes to activate and attach sugars to natural products. Neoglycorandomization is an efficient one-step chemical sugar ligation reaction that does not require prior sugar protection or activation.
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Griffith B.R., Langenhan J.M., and Thorson J.S. 'Sweetening' natural products via glycorandomization. Curr Opin Biotechnol 16 (2005) 622-630. This report highlights recent advances relevant to two complementary glycorandomization strategies. Chemoenzymatic glycorandomization is a biocatalytic approach dependent upon the substrate promiscuity of enzymes to activate and attach sugars to natural products. Neoglycorandomization is an efficient one-step chemical sugar ligation reaction that does not require prior sugar protection or activation.
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This review provides a survey of the synthesis of TDP-activated sugars by chemical and chemoenzymatic approaches and discusses the promiscuity of glycosyltransferases. It summarizes the most important enzymes in the field of synthesis using enzymes from biosynthetic pathways.
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Rupprath C., Schumacher T., and Elling L. Nucleotide deoxysugars: essential tools for the glycosylation engineering of novel bioactive compounds. Curr Med Chem 12 (2005) 1637-1675. This review provides a survey of the synthesis of TDP-activated sugars by chemical and chemoenzymatic approaches and discusses the promiscuity of glycosyltransferases. It summarizes the most important enzymes in the field of synthesis using enzymes from biosynthetic pathways.
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Menendez N., Nur-e-Alam M., Brana A.F., Rohr J., Salas J.A., and Mendez C. Tailoring modification of deoxysugars during biosynthesis of the antitumor drug chromomycin A3 by Streptomyces griseus ssp. griseus. Mol Microbiol 53 (2004) 903-915
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Salas J.A., and Mendez C. Biosynthesis pathways for deoxysugars in antibiotic-producing actinomycetes: isolation, characterization and generation of novel glycosylated derivatives. J Mol Microbiol Biotechnol 9 (2005) 77-85
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Reports the biochemical characterization of purified DesII and the mechanistic implications for the overall C4 deoxygenation. The deoxygenation at the C4 position is proposed to proceed via an amino sugar intermediate. DesII is shown to be a member of the S-adenosylmethionine (SAM) family of radical enzymes. The involvement of a SAM radical in the reaction with DesII identifies a new strategy for deoxygenation reactions of sugars.
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Szu P.-h., He X., Zhao L., and Liu H.-w. Biosynthesis of TDP-D-desosamine: identification of a strategy for C4 deoxygenation. Angew Chem Int Ed Engl 44 (2005) 6742-6746. Reports the biochemical characterization of purified DesII and the mechanistic implications for the overall C4 deoxygenation. The deoxygenation at the C4 position is proposed to proceed via an amino sugar intermediate. DesII is shown to be a member of the S-adenosylmethionine (SAM) family of radical enzymes. The involvement of a SAM radical in the reaction with DesII identifies a new strategy for deoxygenation reactions of sugars.
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In this mini-review, the proposed biosynthetic pathways for the deoxyaminosugar components of both macrolide and non-macrolide antibiotics are highlighted.
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Nedal A., and Zotchev S.B. Biosynthesis of deoxyaminosugars in antibiotic-producing bacteria. Appl Microbiol Biotechnol 64 (2004) 7-15. In this mini-review, the proposed biosynthetic pathways for the deoxyaminosugar components of both macrolide and non-macrolide antibiotics are highlighted.
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Nedal, A.1
Zotchev, S.B.2
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Zhao Z., Hong L., and Liu H.-w. Characterization of protein encoded by spnR from the spinosyn gene cluster of Saccharopolyspora spinosa: mechanistic implications for forosamine biosynthesis. J Am Chem Soc 127 (2005) 7692-7693
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Melancon III C.E., Yu W.-l., and Liu H.-w. TDP-mycaminose biosynthetic pathway revised and conversion of desosamine pathway to mycaminose pathway with one gene. J Am Chem Soc 127 (2005) 12240-12241
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Liu, H.-w.3
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Genes encoding enzymes responsible for biosynthesis of L-lyxose and attachment of eurekanate during avilamycin biosynthesis
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Hofmann C., Boll R., Heitmann B., Hauser G., Duerr C., Frerich A., Weitnauer G., Glaser S.J., and Bechthold A. Genes encoding enzymes responsible for biosynthesis of L-lyxose and attachment of eurekanate during avilamycin biosynthesis. Chem Biol 12 (2005) 1137-1143
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Hofmann, C.1
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Bililign T., Shepard E.M., Ahlert J., and Thorson J.S. On the origin of deoxypentoses: evidence to support a glucose progenitor in the biosynthesis of calicheamicin. ChemBioChem 3 (2002) 1143-1146
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Takahashi H., Liu Y.-n., Chen H., and Liu H.-w. Biosynthesis of TDP-L-mycarose: the specificity of a single enzyme governs the outcome of the pathway. J Am Chem Soc 127 (2005) 9340-9341
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Takahashi, H.1
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The first report to describe in vitro activity of the glycosyltransferase responsible for the attachment of TDP-desosamine to two macrolactones, DesVII from S. venezuelae. DesVII was shown to require the additional protein component DesVIII for its activity; thus, this report stands as the first disclosure of a two-component glycosyltransferase system.
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Borisova S.A., Zhao L., Melancon III C.E., Kao C.-L., and Liu H.-w. Characterization of the glycosyltransferase activity of DesVII: analysis of and implications for the biosynthesis of macrolide antibiotics. J Am Chem Soc 126 (2004) 6534-6535. The first report to describe in vitro activity of the glycosyltransferase responsible for the attachment of TDP-desosamine to two macrolactones, DesVII from S. venezuelae. DesVII was shown to require the additional protein component DesVIII for its activity; thus, this report stands as the first disclosure of a two-component glycosyltransferase system.
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Borisova, S.A.1
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Liu, H.-w.5
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The role of a second protein (DesVIII) in glycosylation for the biosynthesis of hybrid macrolide antibiotics in Streptomyces venezuelae
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Hong J.S.J., Kim W.S., Lee S.K., Koh H.S., Park H.S., Park S.J., Kim Y.S., and Yoon Y.J. The role of a second protein (DesVIII) in glycosylation for the biosynthesis of hybrid macrolide antibiotics in Streptomyces venezuelae. J Microbiol Biotechnol 15 (2005) 640-645
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Hong, J.S.J.1
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Kim, Y.S.7
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Lu W., Leimkuhler C., Gatto G.J., Kruger R.G., Oberthur M., Kahne D., and Walsh C.T. AknT is an activating protein for the glycosyltransferase AknS in L-aminodeoxysugar transfer to the aglycone of aclacinomycin A. Chem Biol 12 (2005) 527-534
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Lu, W.1
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Melancon III C.E., Takahashi H., and Liu H.-w. Characterization of TylM3/TylM2 and MydC/MycB pairs required for efficient glycosyltransfer in macrolide antibiotic biosynthesis. J Am Chem Soc 126 (2004) 16726-16727
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Yuan Y., Chung H.S., Leimkuhler C., Walsh C.T., Kahne D., and Walker S. In vitro reconstitution of EryCIII activity for the preparation of unnatural macrolides. J Am Chem Soc 127 (2005) 14128-14129
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Yuan, Y.1
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Walker, S.6
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28
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A report of an unusually aglycon-indiscriminant glycosyltransferase (VinC) and its application toward constructing small glycoside libraries with diverse hydrophobic aglycon scaffolds. Structural elements of aglycon recognition by VinC were proposed from modeling studies and were supported by the successful glycosylation of a designed aglycon.
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Minami A., Uchida R., Eguchi T., and Kakinuma K. Enzymatic approach to unnatural glycosides with diverse aglycon scaffolds using glycosyltransferase VinC. J Am Chem Soc 127 (2005) 6148-6149. A report of an unusually aglycon-indiscriminant glycosyltransferase (VinC) and its application toward constructing small glycoside libraries with diverse hydrophobic aglycon scaffolds. Structural elements of aglycon recognition by VinC were proposed from modeling studies and were supported by the successful glycosylation of a designed aglycon.
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J Am Chem Soc
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Minami, A.1
Uchida, R.2
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Kakinuma, K.4
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Probing the breadth of macrolide glycosyltransferases: in vitro remodeling of a polyketide antibiotic creates active bacterial uptake and enhances potency
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Yang M., Proctor M.R., Bolam D.N., Errey J.C., Field R.A., Gilbert H.J., and Davis B.G. Probing the breadth of macrolide glycosyltransferases: in vitro remodeling of a polyketide antibiotic creates active bacterial uptake and enhances potency. J Am Chem Soc 127 (2005) 9336-9337
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Yang, M.1
Proctor, M.R.2
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Gilbert, H.J.6
Davis, B.G.7
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Hoffmeister D., Weber M., Draeger G., Ichinose K., Duerr C., and Bechthold A. Rational saccharide extension by using the natural product glycosyltransferase LanGT4. ChemBioChem 5 (2004) 369-371
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Bechthold, A.6
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31
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Iteratively acting glycosyltransferases involved in the hexasaccharide biosynthesis of landomycin A
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Reports detailed studies on the biosynthesis of the hexasaccharide side chain of landomycin A, produced by S. cyanogenus, that revealed the function of each glycosyltransferase gene within the biosynthetic gene cluster. This is the first description of glycosyltransferases (LanGT1 and LanGT4) involved in natural product biosynthesis that are working iteratively on a growing oligosaccharide chain.
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Luzhetskyy A., Fedoryshyn M., Duerr C., Taguchi T., Novikov V., and Bechthold A. Iteratively acting glycosyltransferases involved in the hexasaccharide biosynthesis of landomycin A. Chem Biol 12 (2005) 725-729. Reports detailed studies on the biosynthesis of the hexasaccharide side chain of landomycin A, produced by S. cyanogenus, that revealed the function of each glycosyltransferase gene within the biosynthetic gene cluster. This is the first description of glycosyltransferases (LanGT1 and LanGT4) involved in natural product biosynthesis that are working iteratively on a growing oligosaccharide chain.
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Chem Biol
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Luzhetskyy, A.1
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Duerr, C.3
Taguchi, T.4
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Bechthold, A.6
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32
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Deciphering the late steps in the biosynthesis of the anti-tumour indolocarbazole staurosporine: sugar donor substrate flexibility of the StaG glycosyltransferase
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Staurosporine biosynthesis was reconstituted in vivo in the heterologous host S. albus. Attachment of the sugar to the two indole nitrogens of the indolocarbazole core was shown to be dependent on the combined action of glycosyltransferase StaG and P450 oxygenase StaN. The StaG glycosyltransferase and StaN displayed flexibility with respect to the sugar donor.
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Salas A.P., Zhu L., Sanchez C., Brana A.F., Rohr J., Mendez C., and Salas J.A. Deciphering the late steps in the biosynthesis of the anti-tumour indolocarbazole staurosporine: sugar donor substrate flexibility of the StaG glycosyltransferase. Mol Microbiol 58 (2005) 17-27. Staurosporine biosynthesis was reconstituted in vivo in the heterologous host S. albus. Attachment of the sugar to the two indole nitrogens of the indolocarbazole core was shown to be dependent on the combined action of glycosyltransferase StaG and P450 oxygenase StaN. The StaG glycosyltransferase and StaN displayed flexibility with respect to the sugar donor.
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Mol Microbiol
, vol.58
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Salas, A.P.1
Zhu, L.2
Sanchez, C.3
Brana, A.F.4
Rohr, J.5
Mendez, C.6
Salas, J.A.7
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33
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4544291468
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The glycosyltransferase UrdGT2 catalyzes both C- and O-glycosidic sugar transfers
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The authors demonstrate, for the first time, that the urdamycin C-glycosyltransferase (UrdGT2) displays the unusual ability to generate both C-C and C-O glycosidic bonds. The UrdGT2-catalyzed production of an O-glycoside lends support for one of the two postulated mechanisms for C-glycosylation of aromatic polyketides.
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Durr C., Hoffmeister D., Wohlert S.-E., Ichinose K., Weber M., von Mulert U., Thorson J.S., and Bechthold A. The glycosyltransferase UrdGT2 catalyzes both C- and O-glycosidic sugar transfers. Angew Chem Int Ed Engl 43 (2004) 2962-2965. The authors demonstrate, for the first time, that the urdamycin C-glycosyltransferase (UrdGT2) displays the unusual ability to generate both C-C and C-O glycosidic bonds. The UrdGT2-catalyzed production of an O-glycoside lends support for one of the two postulated mechanisms for C-glycosylation of aromatic polyketides.
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Angew Chem Int Ed Engl
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Durr, C.1
Hoffmeister, D.2
Wohlert, S.-E.3
Ichinose, K.4
Weber, M.5
von Mulert, U.6
Thorson, J.S.7
Bechthold, A.8
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The hedamycin locus implicates a novel aromatic PKS priming mechanism
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Bililign T., Hyun C.-G., Williams J.S., Czisny A.M., and Thorson J.S. The hedamycin locus implicates a novel aromatic PKS priming mechanism. Chem Biol 11 (2004) 959-969
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Hyun, C.-G.2
Williams, J.S.3
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Fischbach M.A., Lin H., Liu D.R., and Walsh C.T. In vitro characterization of IroB, a pathogen-associated C-glycosyltransferase. Proc Natl Acad Sci USA 102 (2005) 571-576
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Seminal report of the glycorandomization proof-of-concept. This study reports both the use of GtfE to construct monoglycosylated vancomycin variants and the downstream application of chemoselective ligation to produce analogs that rival vancomycin in potency.
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Yang J., Fu X., Liao J., Liu L., and Thorson J.S. Structure-based engineering of E. coli galactokinase as a first step toward in vivo glycorandomization. Chem Biol 12 (2005) 657-664. This work reveals a homology model for further structure-based galactokinase engineering and highlights a prototype strain for in vivo phosphorylation of unnatural sugars. This notable success stands as the first step toward constructing short sugar-activation pathways in vivo and, ultimately, a universal glycorandomization strain for in vivo natural product glycodiversification.
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