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Related Concept Videos

Conservation of Protein Domains Over Different Proteins02:26

Conservation of Protein Domains Over Different Proteins

Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
A limited set of protein domains often duplicate and recombine during evolution. These domains can be organized in different combinations to form...
Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Related Experiment Video

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Mapping intact protein isoforms in discovery mode using top-down proteomics.

John C Tran1, Leonid Zamdborg, Dorothy R Ahlf

  • 1Department of Chemistry and Biochemistry, and the Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Nature
|November 1, 2011
PubMed
Summary
This summary is machine-generated.

Researchers developed a new 4D separation system to analyze intact human proteins, identifying over 3,000 protein species and improving proteome coverage by 20-fold for better disease research.

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Area of Science:

  • Proteomics
  • Molecular Biology
  • Biochemistry

Background:

  • Comprehensive human proteome analysis is hindered by challenges in detecting diverse protein forms.
  • Current 'bottom-up' mass spectrometry methods struggle with complex protein modifications and isoforms.
  • Existing 'top-down' approaches lack scalable fractionation for proteome-wide analysis.

Purpose of the Study:

  • To develop and validate a novel 4D separation system for large-scale 'top-down' proteome analysis.
  • To enhance the characterization of intact protein species, including post-translational modifications (PTMs) and alternative splicing.
  • To improve the identification and mapping of human protein isoforms and their biological relevance.

Main Methods:

  • Development of a novel four-dimensional (4D) separation system.
  • Integration of 4D separation with tandem mass spectrometry for intact protein analysis.
  • Application of the system to human cells, including those undergoing accelerated cellular ageing.

Main Results:

  • Identification of 1,043 gene products, yielding over 3,000 distinct protein species.
  • Achieved >20-fold increase in separation power and proteome coverage.
  • Enabled detection of large proteins (up to 105 kDa) and membrane proteins (up to 11 transmembrane helices).
  • Mapped previously undetected protein isoforms and their modifications in response to cellular senescence.
  • Demonstrated precise gene correlations using the Swiss-Prot database.

Conclusions:

  • The new 4D separation system enables scalable 'top-down' proteome analysis, overcoming limitations of previous methods.
  • This technology significantly enhances the ability to detect and characterize complex human protein isoforms and modifications.
  • The findings provide a proof-of-concept for interrogating whole protein molecules at scale, promising improved links between proteomics and complex phenotypes in biological and disease research.