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Protein Protocols Protein Protocols

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526 Fernandez and Mische<br />

Fig. 1. Peptide maps of trypsin digestion of beta galactosidase bound to PVDF. Panels A–D<br />

represent varying amounts of proteins, 40 pmol, 20 pmol, 10 pmol, and 5 pmol respectively.<br />

<strong>Protein</strong>s were analyzed by SDS-PAGE, transferred to PVDF, and stained with Coomassie Brilliant<br />

Blue G-250.<br />

since UV-absorbing contaminants are present in ordinary Triton X-100, making identification<br />

of peptides on subsequent HPLC impossible (see Fig. 1). Alternately, octyl<br />

glucopyranoside (OGP) (Ultrol-grade, Calbiochem) or decyl glucopyranoside (DGP)<br />

(Ultrol-grade, Calbiochem) can be substituted for RTX-100 as described in Table 1.<br />

2.3. Reduction and Carboxyamidomethylation<br />

1. 45 mM DTT: bring 3.5 mg DTT (Ultrol-grade, Calbiochem) up in 500 µL HPLC-grade<br />

water. This can be stored at –20°C for up to 3 mo.

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