Protein microarrays on mirrored surfaces for performing proteomic analyses

Abstract

Provided are protein microarrays, their manufacture, use, and application. Protein microarrays in accordance with the present invention are useful in a variety preoteomic analyses. Various protein arrays in accordance with the present invention may immobilize large arrays of proteins that may be useful for studying protein-protein interactions to improve understanding of disease processes, facilitating drug discovery, or for identifying potential antigens for vaccine development. The protein array elements of the invention are native or modified proteins (e.g., antibodies or fusion proteins). The protein array elements may be attached directly to a organic functionalized mirrored substrate by a binding reaction between functional groups on the substrate (e.g., amine) and protein (e.g., activated carboxylic acid). Techniques for chemical blocking of the arrays are also provided. The invention contemplates spotting of array elements onto solid planar substrates, labeling of complex protein mixtures, and the analysis of protein binding to the array. The invention also enables the enrichment or purification, and subsequent sequencing or structural analysis of proteins that are identified as differential by the array screen. Kits including protein-binding microarrays for proteomic analysis in accordance with the present invention are also provided.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of U.S. patent application Ser. No. 10 / 190,433 titled MICROARRAYS ON MIRRORED SUBSTRATES FOR PERFORMING PROTEOMIC ANALYSES, filed Jul. 3, 2002; which is a continuation-in-part of U.S. patent application Ser. No. 09 / 874,091 titled MICROARRAYS FOR PERFORMING PROTEOMIC ANALYSES, filed Jun. 4, 2001; which claims priority from U.S. Provisional Application No. 60 / 209,711, entitled MICROARRAYS FOR PERFORMING PROTEOMIC ANALYSES, filed Jun. 5, 2000; the disclosure of each of which is incorporated by reference herein in its entirety for all purposes.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to cell product analysis and materials. More specifically, the invention is directed to protein-displaying microarrays, methods of making them and methods of using them to conduct highly sensitive proteomic analyses. [0004] 2. Description of Related Art [0005] In recent ye...

AI Technical Summary

Benefits of technology

[0010] To achieve the foregoing, the present invention provides protein-displaying microarrays (also referred to herein as “protein microarrays”), their manufacture, use, and application. In particular, the invention provides arrays that produce enhanced signals due to the use of a mirrored array substrate surface in an assay in which fluorescently labeled binding partners interact with an array element bound to the substrate surface (e.g., Cy3 or Cy5 other fluorescent probes), referred to herein as “fluorescence array scanning” or “scanning.” A variety of commercially array scanners are available primarily for use in cDNA array scanning. Such sensitive protein microarrays in accordance with the present invention are useful in a variety preoteomic analyses. Various protein arrays in accordance with the present invention may immobilize large arrays of proteins that may be useful for studying protein-protein interactions to improve understanding of disease processes, facilitating drug discovery, or for identifying potential antigens for vaccine development.

[0018] The arrays of the present invention may be usefully applied to the detection of antibodies in serum against potential protein antigens spotted on the array. These studies may help to determine immune response in these patients in order to identify immune-stimulating antigens. By discovering the appropriate antigens, new vaccines may be developed.

Problems solved by technology

In such extreme cases, conventional blocking agents such as casein, bovine serum albumin and the like (protein blocks) may not provide sufficient blocking of non-specific protein binding.

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