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Analysis of Isoprenylated <strong>Protein</strong>s 663<br />

Fig. 5. Chromatographic analyses of isoprenyl-cysteine residues liberated by Pronase E<br />

digestion of recombinant protein substrates enzymatically labeled in vitro by [ 3 H]F-P-P or<br />

[ 3 H]GG-P-P. The recombinant proteins were labeled by incubation with recombinant FTase<br />

(upper panel), GGTase I (upper panel) or GGTase II (lower panel), essentially under the<br />

conditions described previously (19).<br />

2. <strong>Protein</strong>-specific immunoprecipitating antibody.<br />

3. <strong>Protein</strong> A-Sepharose (Pharmacia).<br />

4. Wash buffer A: 20 mM Tris-HCl, pH 7.5, 150 mM NaCl, 0.2% NP-40.<br />

5. Wash buffer B: 20 mM Tris-HCl, pH 7.5, 500 mM NaCl, 0.2% NP-40.<br />

6. Wash buffer C: 20 mM Tris-HCl, pH 7.5, 150 mM NaCl.<br />

7. n-Butanol saturated with water.<br />

8. Tabletop ultracentrifuge (Beckman).

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