Abstract
Brefeldin A (BFA), a fungal metabolite that inhibits membrane transport, potently stimulates an endogenous ADP-ribosylation reaction that selectively modifies two cytosolic proteins of 38 and 50 kDa on an amino acid residue different from those used by all known mADPRTs. The 38-kDa substrate was identified as the glycolytic enzyme glyceraldehyde -3-phosphate dehydrogenase (GAPDH), whereas the 50-kDa substrate (BARS-50) was characterized as a novel guanine nucleotide binding protein. Thus, BARS-50 is able to bind GTP and its ADP-ribosylation is inhibited by the (3y subunit of GTP-binding (G) proteins. Moreover, BARS-50 was demonstrated to be a group of closely related proteins that appear to be different from all the known G proteins. A partially purified BARS-50 was obtained from rat brain cytosol, which was then used for microsequencing and in functional studies. A similar procedure led to the purification of native (non-ADP-ribosylated) BARS-50.
The possible role of the BFA-dependent ADP-ribosylation and of BARS-50 in the maintenance of Golgi structure and function was addressed by examining which of the effects of BFA may be modified by inhibiting this reaction. We find that the BFA-dependent transformation of the Golgi stacks into a tubular reticular network is prevented when the BFA-dependent ADP-ribosylation activity was blocked by specific inhibitors thus indicating that BFA-dependent ADP-ribosylation of cytosolic proteins participate in the dynamic regulation of intracellular transport.
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Silletta, M.G. et al. (1997). Possible Role of BARS-50, A Substrate of Brefeldin A-Dependent Mono-ADP-Ribosylation, in Intracellular Transport. In: Haag, F., Koch-Nolte, F. (eds) ADP-Ribosylation in Animal Tissues. Advances in Experimental Medicine and Biology, vol 419. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8632-0_42
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DOI: https://doi.org/10.1007/978-1-4419-8632-0_42
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