The GA (protein G-related Albumin-binding) module is composed of three alpha helices [1]. This module is found in a range of bacterial cell surface proteins. The GA module from Swiss:Q51911 shows a strong affinity for albumin.

1: Solution structure of the albumin-binding GA module: a versatile bacterial protein domain. Johansson MU, de Chateau M, Wikstrom M, Forsen S, Drakenberg T, Bjorck L J Mol Biol 1997;266:859-865. PMID:9086265