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Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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Sequential Steps of CRAC Channel Activation.

Raz Palty1, Zhu Fu2, Ehud Y Isacoff3

  • 1Department of Biochemistry, Ruth and Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, Haifa 31096, Israel.

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|June 1, 2017
PubMed
Summary
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The STIM1-ORAI1 interaction, crucial for calcium signaling, involves a multi-step activation process. STIM1

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • The STIM1-ORAI1 complex regulates store-operated calcium entry (SOCE), a critical process for cellular functions.
  • Understanding the precise mechanism of STIM1-ORAI1 interaction and ORAI1 channel activation is essential for deciphering calcium signaling pathways.

Purpose of the Study:

  • To investigate the molecular mechanisms by which STIM1 activates the ORAI1 calcium channel.
  • To elucidate the role of the STIM1-ORAI1 activating region (SOAR) in channel gating and activation.

Main Methods:

  • Electrophysiological recordings to measure ORAI1 channel activity.
  • Optical techniques to visualize protein interactions and conformational changes.
  • Biochemical assays to analyze STIM1-SOAR mutations and their binding affinities to ORAI1.

Main Results:

  • Mutations in the STIM1 SOAR region affect ORAI1 binding and activation.
  • SOAR mutants deficient in binding resting ORAI1 can activate partially activated ORAI1 channels.
  • ORAI1 undergoes structural rearrangements upon STIM1 binding, facilitating multi-step activation.

Conclusions:

  • STIM1-mediated ORAI1 activation is a stepwise process involving initial binding, partial activation, and conformational changes in ORAI1.
  • Subsequent STIM1 binding interactions, enabled by ORAI1 rearrangements, lead to full channel activation.
  • This multi-step model provides new insights into the regulation of calcium signaling.