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Chemistry of Carbohydrates03:25

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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Family 6 carbohydrate-binding modules display multiple beta1,3-linked glucan-specific binding interfaces.

Márcia A S Correia1, Virgínia M R Pires, Harry J Gilbert

  • 1CIISA-Faculdade de Medicina Veterinária, Pólo Universitário do Alto da Ajuda, Avenida da Universidade Técnica, Lisboa, Portugal.

FEMS Microbiology Letters
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PubMed
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Family 6 carbohydrate-binding modules (CBM6s) recognize beta1,3-glucans using two binding sites. This differs from other CBM6s, revealing diverse recognition mechanisms for this conserved protein platform.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Noncatalytic carbohydrate-binding modules (CBMs) enhance enzyme activity on insoluble substrates.
  • Family 6 CBMs (CBM6s) possess two potential ligand-binding sites: cleft A and cleft B.
  • CBM6s are crucial for recruiting carbohydrate-degrading enzymes to their target substrates.

Purpose of the Study:

  • To investigate the biochemical properties of CBM6-1 from Cellvibrio mixtus CmCel5A.
  • To determine the specific binding interactions of CBM6-1 with beta1,3-glucans.
  • To compare the binding mechanism of CBM6-1 with previously characterized CBM6s.

Main Methods:

  • Biochemical characterization of CBM6-1.
  • Ligand-binding studies using beta1,3-glucans.
  • Comparative analysis with existing CBM6 data.

Main Results:

  • CBM6-1 specifically recognizes beta1,3-glucans.
  • Binding involves residues in both cleft A and cleft B of CBM6-1.
  • This contrasts with a Bacillus halodurans CBM6, which binds beta1,3-glucans only in cleft A.

Conclusions:

  • CBM6-1 utilizes a distinct binding mechanism involving two clefts for beta1,3-glucan recognition.
  • This highlights the functional diversity within the conserved CBM6 protein family.
  • The findings contribute to understanding carbohydrate-protein interactions and enzyme targeting.