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  • Title: Interaction of phomopsin A with normal and subtilisin-treated bovine brain tubulin.
    Author: Chaudhuri AR, Ludueña RF.
    Journal: J Protein Chem; 1997 Feb; 16(2):99-105. PubMed ID: 9112603.
    Abstract:
    Tubulin, the major component of microtubules, has a tendency to lose its ability to assemble or to bind to ligands in a time-dependent process known as "decay." The decay process also causes tubulin to expose sulfhydryl groups and hydrophobic areas. The antimitotic drug phomopsin A strongly protects the tubulin molecule from decay. Here we have studied the interaction of phomopsin A with alpha beta tubulin and tubulin which has been treated with subtilisin to remove selectively the C-termini of the alpha and beta chains (alpha(s) beta(s)). The binding of phomopsin A to alpha beta tubulin decreases the sulfhydryl titer by approximately 1.0 mol/mol. Selective removal of the peptides from the C-terminal ends does not affect phomopsin A's interaction with tubulin. Moreover, the alpha(s) beta(s) tubulin-phomopsin A complex appears to be more stable than the alpha bet tubulin-phomopsin A complex as determined by the time-dependent increase in exposure of sulfhydryl groups and hydrophobic areas on tubulin. In fact, phomopsin A inhibits the decay process of alpha(s) beta(s) tubulin completely. This observation raises the possibility of determining the conformation of this configuration of tubulin.
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