3.1.3.24 additional information fusion of the catalytic domain of isoform Spp2 to the C-terminus of the monomeric SPP from Synechocystis sp. the catalytic domain is responsible of protein dimerization 751954 3.1.3.24 additional information transgenic plants with reduced enzyme levels due to a RNA interference strategy, plants with less than 10% of wild-type activity display inhibition of photosynthesis, chlorosis, and reduced growth rates. They have strongly reduced levels of sucrose and hexoses but contain 3-5 times more starch than controls 666680