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SDS-PAGE Mapping 557<br />

Fig. 1. Example of peptides separated in an SDS-PAGE gel. Whole cells (WC), a sarkosyl insoluble<br />

pellet, and a periplasmic extract of Neisseria gonorrhoeae were separated in “preparative” 15%<br />

SDS-PAGE gels and blotted to NCP as described in Chapter 79, Subheading 3.1.1. The 37,000-Dalton<br />

major outer membrane protein (POR) and two 44,000-Dalton (44-kDa) proteins, one isolated from a<br />

sarkosyl insoluble (membrane) extract (44-kDa Mem.), and the other isolated from a periplasmic<br />

extract (44-kDa Peri.), were located on the NCP by Ponceau S staining, excised, and cleaved with<br />

BNPS-skatole as described in Chapter 73, Subheading 3.3.1. Approximately 30 µg of peptides<br />

of each protein were solubilized and separated in an SDS-PAGE gel along with whole-cells (WC),<br />

Bio-Rad low-mol-wt markers, and Pharmacia peptide mol-wt markers (mw) (expressed in thousands<br />

of Dalton [k]). The gel was stained with Coomassie brilliant blue (CBB) to visualize peptides.<br />

Acknowledgments<br />

The author thanks Pam Gannon for her assistance and the Public Health Service, NIH,<br />

NIAID (grant RO1 AI21236), and UM Research Program for their continued support.<br />

References<br />

1. Cleveland, D. W., Fischer, S. G., Kirschner, M. W., and Laemmli, U. K. (1977) Peptide<br />

mapping by limited proteolysis in sodium dodecyl sulfate and analysis by gel electrophoresis.<br />

J. Biol. Chem. 252, 1102–1106.<br />

2. Judd, R. C. (1986) Evidence for N-terminal exposure of the PIA subclass of protein I of<br />

Neisseria gonorrhoeae. Infect. Immunol. 54, 408–414.<br />

3. Judd, R. C. (1987) Radioiodination and 125I-labeled peptide mapping on nitrocellulose<br />

membranes. Analyt. Biochem. 160, 306–315.<br />

4. Moos, M., Jr. and Nguyen, N. Y. (1988) Reproducible high-yield sequencing of proteins electrophoretically<br />

separated and transferred to an inert support. J. Biol. Chem. 263, 6005–6008.<br />

5. Laemmli, U. K. (1970) Cleavage of structural proteins during the assembly of the head of<br />

bacteriophage T4. Nature 227, 680–695.<br />

6. Caldwell, H. D. and Judd, R. C. (1982) Structural analysis of chlamydial proteins. Infect.<br />

Immunol. 38, 960–968.<br />

7. Schagger, H. and von Jagow, G. (1987) Tricine-sodium dodecyl sulfate-polyacrylamide<br />

gel electrophoresis for the separation of proteins in the range from 1 to 100 kDa. Analyt.<br />

Biochem. 166, 368–397.

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