α-Mannan in Candida cell wall (α-Mannan)

α-Mannan is a polysaccharide component located primarily in the **outer layer of the Candida cell wall**, consisting of a backbone of **α-1,6-linked mannose** residues with various α-1,2-, α-1,3-, and β-1,2-linked side chains[1][2][7][9]. It is often covalently attached to proteins (thus forming **mannoproteins**), and together these structures form a key interface between Candida and its environment[2][5]. In the context of pathogenesis, α-mannan serves multiple roles: it is involved in **immune evasion** by masking inner cell wall components like β-glucans from host immune detection, contributes to **modulation of host immune responses** as a canonical pathogen-associated molecular pattern (PAMP) recognized by several **pattern recognition receptors** (e.g., mannose receptor, TLR4)[1][6][9], and plays a part in **cell wall permeability and resistance to antifungal therapy**. α-Mannan (or its fragments) can be detected in clinical samples, and this is used as a **biomarker for invasive Candida infections**[9]. As a structural and immunological factor, α-mannan is viewed both as a **potential therapeutic target and a diagnostic antigen**. There are currently no direct therapeutic drugs targeting α-mannan itself, but its role in immune recognition and as a diagnostic marker makes it significant in Candida infection biology and management[9].

Other names

Candida α-mannanCandida cell wall mannanCandida albicans mannanphosphopeptidomannan (PPM)

Masking β-glucans from host immune detection, enabling immune evasion; Direct recognition by host immune receptors (Mannose receptor, TLR4, etc.), triggering immune response[1][6][9]