SppA1 is a serine-type protease that exists in the thylakoid membrane of photosynthetic organisms. The family is represented by one component in higher plants and by two proteins (SppA1 and SppA2) in most cyanobacteria. SppA1 is a photoactivated protease, which may be involved in the domestication of light by photosynthetic membranes.
For research use only, not for clinical use.