Autophosphorylation
Autophosphorylation - Related Videos
09:17
Quantification of Bacterial Histidine Kinase Autophosphorylation Using a Nitrocellulose Binding Assay
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Cited by 3 •
2017
We report and demonstrate an optimized nitrocellulose binding assay that can be used to quantify autophosphorylation of purified bacterial histidine kinases. Our method has several advantages over traditional SDS-PAGE based techniques, providing a valuable alternative for characterizing these important proteins.
04:39
In Vitro Generation of Plasmacytoid Dendritic Cells from Common Lymphoid Progenitors
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2025
This video demonstrates an in vitro assay to generate plasmacytoid dendritic cells (pDCs) from common lymphoid progenitor cells (CLPs). Upon co-culturing purified CLPs with γ-irradiated feeder cells in the presence of Fms-like tyrosine kinase-3 ligand (FL), the CLPs differentiate into non-adherent pDCs, the presence of which is confirmed using flow cytometry.
FAQs
The phosphate acceptor site helps determine what follows the modification. Autophosphorylation can occur at serine, threonine, or tyrosine residues, and the resulting change may alter the protein’s shape, activity, stability, or interactions. Thus, the residue is not merely a chemical attachment point; it can influence how the signaling protein behaves after ATP-derived phosphate transfer.
Two organizational patterns are possible: a protein can modify a residue within its own polypeptide, or one subunit can phosphorylate a partner subunit. This distinction matters because the modification may either regulate the individual protein directly or coordinate activity across a protein complex. In both cases, the phosphate-linked change can affect subsequent signaling behavior.
Autophosphorylation functions as a switch because phosphorylation can move a signaling protein between different functional states. Changes in activity, molecular shape, stability, or binding interactions determine whether downstream signaling molecules can respond. This provides a mechanism for converting an ATP-dependent biochemical event into regulated cellular outputs rather than an unmodulated signal.
At receptor tyrosine kinases, phosphorylation of tyrosine residues is part of the activation process. Once the receptor’s state changes, its altered activity or interactions can influence downstream signaling molecules. This links receptor activity to intracellular regulation and helps explain why receptor tyrosine kinases are prominent components of pathways controlling cell behavior.
Biological outcomes associated with this regulatory mechanism include cell growth, differentiation, metabolism, and immune responses. The same basic phosphate-dependent switch can therefore participate in distinct cellular programs, depending on the signaling protein and its downstream interactions. In biology research, examining where this mechanism operates helps connect protein-level regulation with broader changes in cell behavior.
Abnormal regulation can disrupt the balance between signaling states and may contribute to disease. The concern is not limited to whether phosphate is added; changes in protein activity, stability, shape, or interactions can alter downstream communication. This makes autophosphorylation relevant when studying how signaling proteins become misregulated or fail to coordinate normal cellular responses.