Bio-Rad Laboratories, Inc.

Dennis C Yee

Joseph S Siino, Jr

Lee O Lomas

Lei Li

Robin Baginski

Joseph S Siino

Disclosed herein is a protein standard for gel electrophoresis. The standard may be detected using multiple modalities. These modalities include, for example, observation of color or fluorescence arising from dyes, porphyrins, or haloalkylated tryptophan residues covalently linked to proteins of the standard; or detection of fluorescence or chemiluminescence arising from antibodies or other binding partners bound to proteins of the standard through polypeptide epitopes or affinity tags. The protein standard comprises multiple protein sets, each set corresponding to a different gel band, and proteins within a set may be detectable with one or more modalities.

Protein standard

The invention provides methods of generating physical analog polypeptides, and polypeptides generated employing the methods of the invention, that have the same amino acid composition of a reference protein, but have an unrelated primary sequence. The invention further provides compositions and methods employing such proteins.

Generation of engineered molecular weight standards

Provided is a protein quantitation standard having polypeptides of different molecular weights that functions as a mass quantitation standard in one lane of an electrophoretic gel. The protein quantitation standard includes unstained polypeptides having different electrophoretic mobilities that are present in different quantities, such that the bands in the gel have different intensities when visualized. The protein quantitation standard can also contain prestained polypeptides that function as visual molecular weight markers. Also provided are methods of determining the mass of a target polypeptide or protein using the protein quantitation standard.

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Walnut Creek, CA, United States of America

Dennis C Yee