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Protein Protocols Protein Protocols

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712 Courchesne and Patterson<br />

Fig. 1. Flow chart outlining methods for obtaining peptides from gel-separated proteins by<br />

either digestion in-gel or on-membrane for subsequent MS analysis. In all cases, the spot<br />

(or band) of interest, together with a control piece containing no protein, is excised and<br />

subjected to digestion and extraction of the peptides. For the Immobilon-CD protocol, the<br />

washing and chopping into small pieces steps can be reversed.<br />

homologue) exists in the database. The caveats to this approach and considerations for<br />

interpretation of the results are described.<br />

Finally, we cover generation and analysis of sequence-specific fragment ions using<br />

post-source decay MALDI-MS. Either partially interpreted or uninterpreted<br />

fragment ion data can be used in search programs to identify proteins with high accuracy<br />

in sequence databases, and the use of this approach is also described.<br />

2. Materials<br />

2.1. Equipment<br />

1. Water bath (that can be set at 25°C or 37°C).<br />

2. Sonication bath.<br />

3. Vacuum concentrator (e.g., Speed Vac, Savant).

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