BASP1 and its N-end fragments (BNEMFs) dynamics in rat brain during development

Protein BASP1 was discovered in brains of mammals and birds. In presynaptic area of synapses, BASP1 is attached to plasma membrane owing to N-terminal myristoylation as well as to the positively charged "effecter domain". BASP1 interactions with other proteins as well as with lipids contribute to membrane traffic, axon outgrowth and synaptic plasticity. BASP1 is present also in other tissues, where it was found not only in cytoplasm, but also in nucleus. Nuclear BASP1 suppresses activity of transcription factor WT1 and acts as tumor suppressor. BASP1 deficiency in a cell leads to its transformation. Previously it was shown that in BASP1 samples prepared from different animals and different tissues, six BASP1 N-end myristoylated fragments (BNEMFs) are present. Together, they amount to 30 % of the whole molecules. BNEMFs presence in different species and tissues demonstrates their physiological significance. However BNEMFs remain unexplored. In this paper, the time of appearance and dynamics of both BASP1 and BNEMFs during rat development from embryo to adult animals were determined. In rat brain, the amounts of all BASP1 forms per cell systematically increase during development and remain at the highest levels in adult animals. BNEMFs appear during embryogenesis non-simultaneously and accumulate with different dynamics. These results say for formation of six BNEMFs in the course of different processes and, possibly, using different mechanisms.