Absorption and fluorescence characteristics of photo-activated adenylate cyclase nano-clusters from the amoeboflagellate Naegleria gruberi NEG-M strain

► Adenylyl cyclase nPAC in aqueous pH 7.5 buffer dissolved only to nano-clusters. ► Nano-cluster size was determined by light attenuation (scattering) measurements. ► The size of the nano-clusters was growing by coalescing during observation period. ► In nPAC nano-clusters color centers were present in emission range of 360-900 nm. ► The nPAC color center emission is compared with fluorescent protein emission.