Structure of WbdD: a bifunctional kinase and methyltransferase that regulates the chain length of the O antigen in Escherichia coli O9a

Summary The Escherichia coli serotype O9a O‐antigen polysaccharide (O‐PS) is a model for glycan biosynthesis and export by the ATP‐binding cassette transporter‐dependent pathway. The polymannose O9a O‐PS is synthesized as a polyprenol‐linked glycan by mannosyltransferase enzymes located at the cytop...

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Published inMolecular microbiology Vol. 86; no. 3; pp. 730 - 742
Main Authors Hagelueken, Gregor, Huang, Hexian, Clarke, Bradley R., Lebl, Tomas, Whitfield, Chris, Naismith, James H.
Format Journal Article
LanguageEnglish
Published England Blackwell Publishing Ltd 01.11.2012
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Abstract Summary The Escherichia coli serotype O9a O‐antigen polysaccharide (O‐PS) is a model for glycan biosynthesis and export by the ATP‐binding cassette transporter‐dependent pathway. The polymannose O9a O‐PS is synthesized as a polyprenol‐linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O‐PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non‐reducing mannose of the O‐PS and then methylates the phosphate, stopping polymerization. The 2.2 Å resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C‐terminal coiled‐coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho‐associated protein kinase (ROCK). WbdD phosphorylates 2‐α‐d‐mannosyl‐d‐mannose (2α‐MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co‐complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro, they do not show any in vivo activity. The structures reveal new insight into O‐PS chain‐length regulation in this important model system.
AbstractList The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette transporter-dependent pathway. The polymannose O9a O-PS is synthesized as a polyprenol-linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O-PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non-reducing mannose of the O-PS and then methylates the phosphate, stopping polymerization. The 2.2 Aa resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C-terminal coiled-coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho-associated protein kinase (ROCK). WbdD phosphorylates 2- alpha -d-mannosyl-d-mannose (2 alpha -MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co-complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro, they do not show any in vivo activity. The structures reveal new insight into O-PS chain-length regulation in this important model system.
The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette transporter-dependent pathway. The polymannose O9a O-PS is synthesized as a polyprenol-linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O-PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non-reducing mannose of the O-PS and then methylates the phosphate, stopping polymerization. The 2.2 Å resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C-terminal coiled-coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho-associated protein kinase (ROCK). WbdD phosphorylates 2-α-d-mannosyl-d-mannose (2α-MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co-complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro, they do not show any in vivo activity. The structures reveal new insight into O-PS chain-length regulation in this important model system.
The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette transporter-dependent pathway. The polymannose O9a O-PS is synthesized as a polyprenol-linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O-PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non-reducing mannose of the O-PS and then methylates the phosphate, stopping polymerization. The 2.2 Å resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C-terminal coiled-coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho-associated protein kinase (ROCK). WbdD phosphorylates 2-α- d -mannosyl- d -mannose (2α-MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co-complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro , they do not show any in vivo activity. The structures reveal new insight into O-PS chain-length regulation in this important model system.
Summary The Escherichia coli serotype O9a O‐antigen polysaccharide (O‐PS) is a model for glycan biosynthesis and export by the ATP‐binding cassette transporter‐dependent pathway. The polymannose O9a O‐PS is synthesized as a polyprenol‐linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O‐PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non‐reducing mannose of the O‐PS and then methylates the phosphate, stopping polymerization. The 2.2 Å resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C‐terminal coiled‐coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho‐associated protein kinase (ROCK). WbdD phosphorylates 2‐α‐d‐mannosyl‐d‐mannose (2α‐MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co‐complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro, they do not show any in vivo activity. The structures reveal new insight into O‐PS chain‐length regulation in this important model system.
The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette transporter-dependent pathway. The polymannose O9a O-PS is synthesized as a polyprenol-linked glycan by mannosyltransferase enzymes located at the cytoplasmic membrane. The chain length of the O9a O-PS is tightly regulated by the WbdD enzyme. WbdD first phosphorylates the terminal non-reducing mannose of the O-PS and then methylates the phosphate, stopping polymerization. The 2.2 ... resolution structure of WbdD reveals a bacterial methyltransferase domain joined to a eukaryotic kinase domain. The kinase domain is again fused to an extended C-terminal coiled-coil domain reminiscent of eukaryotic DMPK (Myotonic Dystrophy Protein Kinase) family kinases such as Rho-associated protein kinase (ROCK). WbdD phosphorylates 2-α-d-mannosyl-d-mannose (2α-MB), a short mimic of the O9a polymer. Mutagenesis identifies those residues important in catalysis and substrate recognition and the in vivo phenotypes of these mutants are used to dissect the termination reaction. We have determined the structures of co-complexes of WbdD with two known eukaryotic protein kinase inhibitors. Although these are potent inhibitors in vitro, they do not show any in vivo activity. The structures reveal new insight into O-PS chain-length regulation in this important model system. (ProQuest: ... denotes formulae/symbols omitted.)
Author Whitfield, Chris
Hagelueken, Gregor
Huang, Hexian
Lebl, Tomas
Clarke, Bradley R.
Naismith, James H.
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Snippet Summary The Escherichia coli serotype O9a O‐antigen polysaccharide (O‐PS) is a model for glycan biosynthesis and export by the ATP‐binding cassette...
The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette...
The Escherichia coli serotype O9a O-antigen polysaccharide (O-PS) is a model for glycan biosynthesis and export by the ATP-binding cassette...
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SubjectTerms Amino Acid Sequence
Antigens
Biosynthesis
Carbohydrates
E coli
Escherichia coli
Escherichia coli - chemistry
Escherichia coli - enzymology
Escherichia coli - genetics
Escherichia coli - metabolism
Escherichia coli Proteins - chemistry
Escherichia coli Proteins - genetics
Escherichia coli Proteins - metabolism
Eukaryotes
Kinases
Methyltransferases - chemistry
Methyltransferases - genetics
Methyltransferases - metabolism
Models, Molecular
Molecular Sequence Data
Mutagenesis
O Antigens - chemistry
O Antigens - metabolism
Polysaccharides, Bacterial - chemistry
Polysaccharides, Bacterial - metabolism
Protein Kinases - chemistry
Protein Kinases - genetics
Protein Kinases - metabolism
Protein Structure, Tertiary
Sequence Alignment
Substrate Specificity
Title Structure of WbdD: a bifunctional kinase and methyltransferase that regulates the chain length of the O antigen in Escherichia coli O9a
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https://www.proquest.com/docview/1115383114
https://search.proquest.com/docview/1171898518
https://pubmed.ncbi.nlm.nih.gov/PMC3482155
Volume 86
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