Mixed-linkage glucan

Structure

MLG is composed of β-D(1-3) and β-D(1-4)-linked glucosyl residues. Typically there are regions of 2-5 β-D(1-4)-linked residues separated by β-D(1-3)-linkages. The β-D(1-4)-linked residues form rigid regions of the structure while the β-D(1-3)-links are flexible.

Roles in the diet

MLGs exhibit the physiological properties of dietary fibres and the functional properties of viscous and gel-forming food hydrocolloids.

Functions in plants

The prevalence of MLG within the poales and Equisetum suggests a definite role in their growth. However the presence of the enzyme mixed-linkage glucan : xyloglucan endotransglucosylase within Equiseta suggest that the role of MLG in each may be different.

References

References

1. (2008). "Mixed-linkage (1→3,1→4)-β-d-glucan is a major hemicellulose of ''Equisetum'' (horsetail) cell walls". New Phytologist.
2. (2008). "Mixed-linkage (1→3),(1→4)-β-d-glucan is not unique to the Poales and is an abundant component of ''Equisetum arvense'' cell walls". The Plant Journal.
3. (2007). "Molecular aspects of cereal β-glucan functionality: Physical properties, technological applications and physiological effects". Journal of Cereal Science.