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-Structure paper
タイトル | A coiled-coil domain acts as a molecular ruler to regulate O-antigen chain length in lipopolysaccharide. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 22, Issue 1, Page 50-56, Year 2015 |
掲載日 | 2014年12月15日 |
著者 | Gregor Hagelueken / Bradley R Clarke / Hexian Huang / Anne Tuukkanen / Iulia Danciu / Dmitri I Svergun / Rohanah Hussain / Huanting Liu / Chris Whitfield / James H Naismith / |
PubMed 要旨 | Long-chain bacterial polysaccharides have important roles in pathogenicity. In Escherichia coli O9a, a model for ABC transporter-dependent polysaccharide assembly, a large extracellular carbohydrate ...Long-chain bacterial polysaccharides have important roles in pathogenicity. In Escherichia coli O9a, a model for ABC transporter-dependent polysaccharide assembly, a large extracellular carbohydrate with a narrow size distribution is polymerized from monosaccharides by a complex of two proteins, WbdA (polymerase) and WbdD (terminating protein). Combining crystallography and small-angle X-ray scattering, we found that the C-terminal domain of WbdD contains an extended coiled-coil that physically separates WbdA from the catalytic domain of WbdD. The effects of insertions and deletions in the coiled-coil region were analyzed in vivo, revealing that polymer size is controlled by varying the length of the coiled-coil domain. Thus, the coiled-coil domain of WbdD functions as a molecular ruler that, along with WbdA:WbdD stoichiometry, controls the chain length of a model bacterial polysaccharide. |
リンク | Nat Struct Mol Biol / PubMed:25504321 / PubMed Central |
手法 | SAS (X-ray synchrotron) / X線回折 |
解像度 | 3.87 Å |
構造データ | SASDAH6: SASDAJ6: PDB-4uw0: |
化合物 | ChemComp-SAM: |
由来 |
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キーワード | TRANSFERASE / KINASE / METHYLTRANSFERASE |