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Protein Protocols Protein Protocols

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678 Dowdy<br />

Fig. 2. A cross-sectional view of the Multiphor II apparatus. Loaded TLC plate, Whatman<br />

3MM filter paper wicks, and glass cover plate are depicted in the running position (see Subheading<br />

3.4., steps 2 and 3).<br />

Fig. 3. Two-dimensional phosphopeptide map of the retinoblastoma tumor-suppressor gene<br />

product (pRb) labeled with 32 P-phosphate in vivo. pRb contains 13 cyclin-dependent kinase<br />

(cdk) phosphorylation sites, hence the complexity of the phosphopeptide map. Note the presence<br />

of several levels of 32 P intensity associated with specific peptides. This can arise by a<br />

number of mechanisms, including in vivo site preferences and/or accessibility of the nitrocellulose<br />

immobilized 32 P-labeled protein to trypsin. The origin, first-, and second-dimension runs<br />

are as indicated (see Subheading 3.4., step 7).

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