Related Experiment Video
Updated: May 12, 2026
10:31
Real-time Live Imaging of T-cell Signaling Complex Formation
Published on: June 23, 2013
AKAP signalling complexes: focal points in space and time.
1Howard Hughes Medical Institute/Vollum Institute, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, L-474, Portland, Oregon 97239, USA.
Nature Reviews. Molecular Cell Biology
|December 2, 2004
Summary
Signal-organizing molecules called A-kinase anchoring proteins (AKAPs) control enzyme activity and localization within cells. They ensure specific protein phosphorylation events occur at the right time and place, crucial for cellular signaling pathways.
Area of Science:
- Cellular Biology
- Molecular Signaling
- Biochemistry
Background:
- Multiprotein signaling networks regulate intracellular hormone and neurotransmitter actions.
- Spatio-temporal activation of protein kinases and phosphatases is critical for controlling phosphorylation events.
- Anchoring proteins organize enzymes, directing them to specific substrates.
Purpose of the Study:
- To elucidate the role of anchoring proteins in cellular signaling.
- To understand how A-kinase anchoring proteins (AKAPs) compartmentalize enzymes.
- To investigate the mechanism by which AKAPs control enzyme activity and substrate specificity.
Main Methods:
- Analysis of protein-protein interactions.
- Enzyme activity assays.
- Cellular localization studies.
Main Results:
- AKAPs serve as scaffolds, organizing signaling enzymes.
- AKAPs ensure precise spatio-temporal control of protein phosphorylation.
- AKAPs compartmentalize enzymes regulated by second messengers.
Conclusions:
- AKAPs are essential signal-organizing molecules.
- AKAPs provide a framework for directed enzyme activity.
- AKAPs play a key role in regulating cellular responses to hormones and neurotransmitters.
Related Concept Videos
01:19Contact-dependent Signaling
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
Gap Junctions
In animal cells, gap junctions are formed...
01:22Microtubules in Signaling
The primary cilium, made up of microtubules, acts as antennae on the cell surfaces for relaying external stimuli into the cells. These fine hair-like structures are present, generally one per cell. These are non-motile cilia in a 9+0 microtubules arrangement, where the central pair of microtubules are absent. The primary cilia arise from the basal body embedded in the cell membrane. Intraflagellar transport (IFT) carries requisite proteins from the cytoplasm to the cilium because the primary...
01:32Cytoskeletal Coordination in Cell Migration
A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker proteins that...
01:30Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
01:17Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
01:03Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...