Carbohydrates articles from across Nature Portfolio

An ensemble of cryo-electron microscopy structures of the KpsMT ABC transporter in complex with the KpsE co-polymerase and a glycolipid substrate reveal how capsular polysaccharides are recognized and translocated across bacterial cell membranes.

Glycosyltransferases that build bacterial surface polysaccharides were classified into 17 new CAZy families. A glycan analysis reveals that the enzymes within each family transfer similar sugars even across Gram-negative and Gram-positive bacteria.

Here, the authors present the structure of cyclic β-1,2-glucan synthase from Agrobacterium tumefaciens, revealing a distinct mechanism that uses a tyrosine-linked oligosaccharide intermediate in cycles of polymerization and processing of the glucan chain.

Mucins are glycosylated proteins with important biological functions such as protection. Although glycopeptidases can cleave them, dedicated hydrolytic enzymes specific for mucins were unknown. Now microbial mucinases are discovered that specifically recognize mucin O-glycan clusters and employ two glutamic acid residues for catalytic cleavage.

The Periodic Table of Food Initiative addresses food biomolecular composition information gaps through a standardized, accessible and enabling platform based on analytical tools, data and capacity building. Data from 1,650 foods serve as starting point for demonstrating the capacity of this initiative to contribute to nutrition, health and food systems transformations.

Analyzing glycans is challenging because of their structural diversity and complexity and the lack of analytical techniques capable of resolving pools of similar glycan structures. A new method now enables imaging of single glycans, providing direct observation of individual glycans and glycoconjugates.

Glucose transporter-mediated uptake of glucose is a key metabolic checkpoint in T cells. Fu et al. have identified GLUT2 as a critical regulator of CD8⁺ T cell metabolism and function in response to glucose and oxygen availability.

A chemoenzymatic strategy is introduced whereby a glycan backbone is assembled enzymatically to give a core oligosaccharide that is subjected to chemical manipulations to install terminal epitopes. A library of oligosaccharides containing the human natural killer-1 epitope was synthesized, enabling evaluation of the binding specificities of serum antibodies of patients with anti-myelin-associated glycoprotein neuropathy.