Polyhydroxyalkanoates (PHAs) are storage polyesters synthesised by various bacteria as intracellular carbon and energy reserve material. PHAs are accumulated as water-insoluble inclusions within the cells. This family consists of the phasins PhaF and PhaI which act as a transcriptional regulator of PHA biosynthesis genes. PhaF has been proposed to repress expression of the phaC1 gene and the phaIF operon [1].

1: Isolation and characterization of polyhydroxyalkanoates inclusions and their associated proteins in Pseudomonas sp. 61-3. Matsumoto K, Matsusaki H, Taguchi K, Seki M, Doi Y; Biomacromolecules 2002;3:787-792. PMID:12099824