Carnegie Mellon University

Jonathan Minden

Alan Waggoner

Alan S Waggoner

Susan Janet Fowler

Frederick Lanni

Phu T Van

Amber Lucas

Provided herein are methods, reagents, and kits for isolating polypeptides, such as a proteome. Also provided herein is a modified trypsin polypeptide that is resistant to autolysis, and that can be selectively-separated from a biological sample once digestion is complete.

Protein and peptide purification methods

The present disclosure provides systems and methods for the measurement of signal intensity across a large dynamic range. The systems disclosed herein employ an iterative image collection strategy that utilizes structured illumination to achieve greater than 1,000,000-fold dynamic range measurements, representing a dramatic improvement over the prior art.

Structured illumination system for increased dynamic range in quantitative imaging

A process and a kit are provided for detecting differences in two or more samples of protein, including proteins bearing post-translational modifications and peptides. Proteins are prepared, for example, from each of a different group of cell samples or body fluid samples to be compared. Each protein extract is labeled with a different one of a luminescent dye from a matched set of dyes. The matched dyes have generally the same ionic and pH characteristics but emit light at different wavelengths to exhibit a different color upon luminescence detection. The labeled protein extracts are mixed together and separated together by electrophoresis or a chromatographic method. The separation is observed to detect proteins unique to one sample or present in a greater ratio in one sample than in the other. Those unique or excess proteins will fluoresce the color of one of the dyes used. Proteins common to each sample migrate together and fluoresce the same.

Difference detection methods using matched multiple dyes

The invention relates to a sample retrieval apparatus of particular benefit in the field of molecular biology. The apparatus permits the rapid collection of numerous specified fractions of samples: such as DNA, RNA or protein, that are separated by gel electrophoresis; or microorganisms grown on agar plates. The apparatus is capable of multiple sample retrieval from gels without cross-sample contamination from previously excised samples. Specifically, the sample retrieval apparatus is able to engage a cutting tip, cut a desired spot, band or plaque from a gel, deposit the desired band or plaque into a container, such as a multi-well plate for processing, and disengage the used cutting tip. The apparatus is then able to repeat this process many times to facilitate rapid and accurate processing of multiple bands or plaques from a single gel using different cutting tips for each sample retrieval.

Cutting tool for multiple sample retrieval from gelatinous material

A process and a kit are provided for detecting differences in two or more samples of protein. Protein extracts are prepared, for example, from each of a different group of cell samples to be compared. Each protein extract is labeled with a different one of a luminescent dye from a matched set of dyes. The matched dyes have generally the same ionic and pH characteristics but emit light at different wavelengths to exhibit a different color upon luminescence detection. The labeled protein extracts are mixed together and electrophoresed together. The gel is observed to detect proteins unique to one sample or present in a greater ratio in one sample than in the other. Those unique or excess proteins will fluoresce the color of one of the dyes used. Proteins common to each sample migrate together and fluoresce the same.

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Pittsburgh, PA, United States of America

Jonathan Minden