Title: The 65‐kDa protein from pig heart A new substrate for <i>Clostridium botulinum</i> ADP‐ribosyltransferase (exoenzyme C<sub>3</sub>)
Abstract: In the pig heart sarcolemma, a 65 kDa protein is found to be ADP-ribosylated by Clostridium botulinum ADP-ribosyltransferase (exoenzyme C3). ADP-ribosylation of this protein is regulated by guanyl nucleotides and cytosol factor in a fashion similar to that for other C3 substrates. The new exoenzyme C3 substrate was partially purified. This protein is supposed to be a GTP-binding one.