Overview
The proteome is the entire collection of proteins that are produced, modified and present in a particular cell, tissue or organism under specific conditions. Unlike a static genome, a proteome changes with development, environment, disease state and cellular signaling, reflecting the active molecular machinery at a given time.
Characteristics and complexity
Proteomes include not only the primary amino acid sequences encoded by genes but also multiple forms created by alternative splicing, post-translational modifications (phosphorylation, glycosylation, acetylation, etc.) and proteolytic processing. These distinct molecular variants are often called proteoforms and they greatly increase functional diversity beyond the number of genes.
History and terminology
The term "proteome"—a blend of protein and genome—was proposed in the 1990s to capture the concept of a complete protein complement for an organism. It was suggested in 1994 by Marc Wilkins of the University of New South Wales, and the name helped give rise to the research field called proteomics. The proteome is defined for an organism, tissue, cell type or subcellular compartment.
Methods and applications
Modern proteomics uses tools such as mass spectrometry, two-dimensional gel electrophoresis and affinity-based techniques to identify, quantify and characterize proteins and their modifications. Common applications include biomarker discovery, mapping signaling pathways, understanding disease mechanisms, and identifying targets for drug development.
- Identification and quantification of proteins by mass spectrometry
- Characterization of post-translational modifications
- Comparative studies between healthy and diseased tissues
Distinctions and notable facts
Unlike the genome, which is largely constant, the proteome is dynamic and context-dependent. Large-scale efforts such as various national and international proteome projects aim to catalog protein expression and modification patterns for model organisms and humans. The study of proteomes continues to reveal how genetic information is realized as functional molecules and how protein networks govern cellular behavior.
For further reading on related concepts and researchers, see resources linked to protein, genome, prominent institutions like University of New South Wales and foundational contributors such as Marc Wilkins.