Alpha-haemoglobin stabilising protein (AHSP) acts a molecular chaperone for free alpha-haemoglobin, preventing the harmful aggregation of alpha-haemoglobin during normal erythroid cell development: it specifically protects free alpha-haemoglobin from precipitation. AHSP adopts a helical secondary structure consisting of an elongated antiparallel three alpha-helix bundle [1].

1: NMR structure of the alpha-hemoglobin stabilizing protein: insights into conformational heterogeneity and binding. Santiveri CM, Perez-Canadillas JM, Vadivelu MK, Allen MD, Rutherford TJ, Watkins NA, Bycroft M; J Biol Chem. 2004;279:34963-34970. PMID:15178680