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Structural insights into alginate binding by bacterial cell-surface protein.

Kanate Temtrirath1, Kousaku Murata1, Wataru Hashimoto1

  • 1Laboratory of Basic and Applied Molecular Biotechnology, Division of Food Science and Biotechnology, Graduate School of Agriculture, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.

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|February 11, 2015
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Summary

Sphingomonas sp. strain A1 uses a cell-surface protein, Algp7, to bind and import alginate polymers. Researchers identified Lys68 and Lys69 residues on Algp7 as crucial for this alginate binding process.

Keywords:
Alginate-binding proteinDocking simulationEfeOSphingomonasX-ray crystallography

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Sphingomonas sp. strain A1 forms a unique cell-surface pit for direct polymer import.
  • The cell-surface protein Algp7 is implicated in alginate binding and accumulation within this pit.

Purpose of the Study:

  • To identify the specific residues on Algp7 responsible for alginate binding.
  • To elucidate the structural basis of alginate-Algp7 interaction.

Main Methods:

  • X-ray crystallography to determine Algp7 tertiary structure.
  • In silico docking simulations of Algp7 with alginate oligosaccharides.
  • Site-directed mutagenesis of Algp7, followed by binding assays (UV absorption difference spectroscopy, differential scanning fluorimetry).

Main Results:

  • The tertiary structure of Algp7 was resolved at 1.99Å resolution.
  • Docking simulations suggested charged residues as potential alginate-binding sites.
  • Mutagenesis revealed that the K68A/K69A double mutant showed significantly reduced alginate binding affinity compared to wild-type Algp7.

Conclusions:

  • The positively charged cluster, specifically Lys68 and Lys69 residues of Algp7, plays a critical role in binding alginate.
  • This finding deepens the understanding of bacterial polymer uptake mechanisms.