The photochromic retinal protein bacteriorhodopsin which was obtained from Halobacterium salinarium has been studied as the photoactive component of recording materials for different dynamic holographic applications like degenerate-four-wave-mixing (DFWM) and interferometry. With the mutated BR-variant D96N resonantly induced reflectivities of up to 20% are observed at 647 nm in DFWM. The excellent reversibility of the BR-materials and the extended thermal decay time of this particular BR-variant support its application in real-time interferometry.