Avram Hershko

Avram Hershko is an Israeli biochemist who shared the 2004 Nobel Prize in Chemistry for discovering how ubiquitin marks proteins for degradation.

Aaron Ciechanover: An Israeli biochemist who shared the 2004 Nobel Prize in Chemistry for discovering ubiquitin-mediated protein degradation. Hershko and Ciechanover worked together to uncover the pathway’s stages.
Ubiquitin: A small protein that can be attached to other proteins, often marking them for degradation. Hershko’s research established its role as a molecular tag for targeted protein breakdown.
ATP-dependent proteolysis: The breakdown of proteins through a process that requires energy from ATP. Hershko’s early experiments showed that this activity depended on ATP and a soluble factor.
Protein turnover: The continuous synthesis and degradation of proteins within cells and organisms. Hershko’s discovery explained a major selective route by which cells replace proteins.
Irwin Rose: An American biochemist who shared the 2004 Nobel Prize in Chemistry for discovering ubiquitin-mediated protein degradation. Rose joined Hershko and Ciechanover in identifying the ATP-dependent degradation system.
Ubiquitination: The enzymatic attachment of ubiquitin to a protein or another molecule. This tagging process is the central recognition step in the pathway Hershko helped uncover.
Reticulocyte lysate: A cell-free extract made from immature red blood cells, used to study protein synthesis and degradation. Hershko and collaborators used extracts to track protein degradation outside intact cells.
Cell cycle: The ordered sequence of events through which a cell grows and divides. Ubiquitin-mediated degradation regulates proteins whose timely removal controls cell-cycle transitions.
Nobel Prize in Chemistry: An annual international award recognizing major contributions to chemistry. Hershko received the 2004 prize with Ciechanover and Rose for their discovery.
Ubiquitin-activating enzyme: An enzyme that uses ATP to activate ubiquitin and begin its transfer to a target protein. Hershko’s experiments identified the ATP-dependent first step of ubiquitin attachment.

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