Group A carbohydrate
group a carbohydrate
A polysaccharide composed of a [3)-α-Rha<em>p</em>-(1→2)-α-Rha<em>p</em>-(1→]<small><sub><em>n</em></sub></small> rhamnose polysaccharide backbone with a β-<small>D</small>-Glc<em>p</em>NAc side-chain modification on every α-1,2-linked rhamnose. A bacterial peptidoglycan-anchored surface rhamnose polysaccharide that is essential for growth of <em>Streptococcus pyogenes</em> and contributes to its ability to infect the human host.