Protein form and function

Whitehead Institute Member Jonathan Weissman and colleagues used large-scale systematic genetic screens to identify the molecules and pathways that populate the mitochondrial surface with important and diverse signaling proteins. They deciphered the logic by which the cell ensures the proper delivery of these proteins. These findings may have important implications for understanding the impact on health and disease when these processes go awry.

Rare neurodegenerative diseases have been linked to excessive repeats in the DNA sequence. Whitehead Institute Member Ankur Jain and colleagues have uncovered a new mechanism that explains how an expanded CAG repeat — like the one involved in Huntington’s disease — can lead to the production of abnormal proteins, disrupting cell function.

Apicomplexan parasites are responsible for several prevalent infectious diseases including malaria. Whitehead Institute Member Sebastian Lourido and colleagues identified a protein complex that the parasites require for a critical step in invading host cells.

Whitehead Institute Member Sebastian Lourido and colleagues identified key parts of the pathway that enables apicomplexan parasites to exit one host cell, and travel to infect others, including the important role of a molecule they called HOOK. This finding illuminates how signals can move in cells and could inform drug development against the parasites.

Transcription factors bind DNA and protein. Now, researchers in Whitehead Institute Member Richard Young’s lab find that many transcription factors can also bind RNA, which fine tunes their regulation of gene expression, suggesting new therapeutic opportunities.

Eric Smith is a postdoc in Whitehead Institute Member Iain Cheeseman’s lab studying proteins involved in cancer. We sat down with Eric to learn more about him and his experiences in and out of the lab.

How do cells decide how long to pause division after they detect errors? Whitehead Institute Member Iain Cheeseman and colleagues identified that the key player is a previously undiscovered protein that was hiding in plain sight. Read more and also check out our Behind the Science podcast looking at the unexpected nature of this discovery.

Sperm use tiny proteins to pack their DNA correctly. New research explains how and why sperm cells balance the different versions of these proteins.

Researchers from Whitehead Institute Member Jing-Ke Weng’s lab figured out how a newly- discovered plant enzyme performs its unique chemistry, helping plants make a heart-healthy molecule.