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Related Experiment Videos

Structural basis for oligosaccharide recognition by Pyrococcus furiosus maltodextrin-binding protein.

A G Evdokimov1, D E Anderson, K M Routzahn

  • 1Protein Engineering Section, Macromolecular Crystallography Laboratory, National Cancer Institute-Frederick Cancer Research and Development Center, P.O. Box B, Frederick, MD 21702-1201, USA. eudokima@mail.ncifrc.gov

Journal of Molecular Biology
|February 13, 2001
PubMed
Summary

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Pyrococcus furiosus maltodextrin-binding protein (PfuMBP) exhibits high stability and a preference for binding longer oligosaccharides like maltotriose over maltose. This protein is optimized for binding three or more glucopyranose units.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Microbiology

Background:

  • Maltodextrin-binding proteins (MBPs) are crucial in carbohydrate metabolism.
  • Understanding the structural and functional properties of extremophilic MBPs offers insights into protein stability.

Purpose of the Study:

  • To characterize the maltodextrin-binding protein from Pyrococcus furiosus (PfuMBP).
  • To determine the crystal structure of PfuMBP bound to an oligosaccharide ligand.
  • To investigate the binding specificity and thermal stability of PfuMBP.

Main Methods:

  • Overproduction and purification of PfuMBP in E. coli.
  • X-ray crystallography to determine protein-ligand complex structure.
  • Isothermal titration calorimetry (ITC) to assess binding thermodynamics.

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Main Results:

  • The crystal structure of PfuMBP bound to maltotriose was determined at 1.85 Å resolution.
  • PfuMBP shares structural similarity with E. coli MBP despite moderate sequence identity.
  • PfuMBP demonstrated high resistance to heat and chemical denaturation.
  • ITC revealed tight, exothermic binding of maltotriose, with no thermal effect for maltose.

Conclusions:

  • PfuMBP is structurally analogous to EcoMBP but possesses enhanced stability.
  • The protein exhibits a clear preference for binding oligosaccharides of three or more glucose units.
  • PfuMBP's stability is attributed to its tightly packed hydrophobic core and specific residue interactions.