Phosphopeptide Binding
Phosphopeptide Binding - Related Videos
03:33
Titanium Dioxide-based Enrichment of Phosphopeptides: A Method for the Selective Isolation of Phosphopeptides from Peptide Library
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2023
This video demonstrates titanium dioxide-based enrichment of phosphopeptides extracted from prostate tumor tissue. These enriched phosphopeptides can be used for downstream applications such as protein characterization to understand cell signaling pathways involved in prostate cancer progression.
04:50
Phosphopeptide Enrichment: An Antibody-based Immunoprecipitation Technique to Separate Specific Phosphorylated Peptides from Complex Peptide Mixtures
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2023
In this video, we demonstrate antibody-based immunoprecipitation of phosphopeptides from a peptide mixture. The enriched phosphopeptides are vacuum concentrated and stored for downstream analysis.
09:30
Phosphopeptide Analysis of Rodent Epididymal Spermatozoa
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Cited by 26 •
2014
Proteomic analysis of any cell type is highly dependent on both purity and pre-fractionation of the starting material in order to de-complexify the sample prior to liquid chromatography mass spectrometry (MS). By using back-flushing techniques, pure spermatozoa can be obtained from rodents. Following digestion, phosphopeptides can be enriched using TiO2.
02:18
The Equilibrium Binding Constant and Binding Strength
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2020
The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium: where P and L are the unbound protein and ligand, respectively, and PL is the protein-ligand complex. As the amount of bound ligand is also related to the rate of ligand binding, experiments can also determine Kb by examining the rates of protein-ligand association (kon) and dissociation (koff) using the following ratio: Thus,...
02:40
Ligand Binding Sites
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2020
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands. Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
FAQs
Selectivity depends on more than the phosphate itself. In SH2 or phosphotyrosine-binding domains, the phosphate contributes electrostatic attraction and hydrogen-bond contacts, while the peptide sequence helps determine which binding partner is favored. This combination allows related signaling proteins to distinguish particular phosphorylated targets, helping specify which molecular interactions occur after a phosphorylation event.
The residues surrounding the phosphorylated amino acid provide sequence information that complements phosphate recognition. Although the phosphate creates important electrostatic and hydrogen-bond interactions, neighboring residues help a binding protein discriminate among different phosphopeptides. This added specificity determines which signaling partners are recruited and helps explain why phosphorylation at different sites can produce distinct cellular responses.
Binding can change signaling in two principal ways: it can recruit an additional signaling partner or alter the activity of the protein that recognizes the phosphopeptide. These outcomes connect a phosphorylation event to downstream changes in cellular behavior. In cancer-related pathways, such interactions can influence proliferation, survival, migration, or responses to DNA damage.
Abnormal phosphorylation can rewire the interactions that organize signaling pathways. When binding proteins recognize altered phosphopeptide patterns, they may recruit different partners or modify protein activity, changing regulatory networks that control proliferation, survival, migration, and DNA damage responses. Studying these interactions therefore helps connect molecular phosphorylation changes with mechanisms that contribute to oncogenesis.
Analysis can reveal how phosphorylation-dependent interactions organize signaling networks in cancer. It can show which molecular contacts accompany dysregulated control of proliferation, survival, migration, or DNA damage responses. This information helps researchers move from observing abnormal phosphorylation to understanding its functional consequences, providing mechanistic context for how oncogenic signaling is established or maintained.
These studies can identify phosphorylation-dependent interactions associated with dysregulated signaling networks. If particular binding patterns reflect changes linked to proliferation, survival, migration, or DNA damage responses, they may help distinguish molecular features of cancer-related signaling. The resulting interaction information supports biomarker discovery by connecting specific phosphorylation events with functional pathway abnormalities rather than treating phosphorylation as an isolated measurement.
Mapping these interactions can identify signaling contacts that are important for recruiting partners or altering protein activity. In cancer research, such information helps define dysregulated networks and highlights interactions that could be disrupted to modify abnormal signaling. The approach therefore supports development of therapies aimed at interfering with phosphorylation-dependent communication rather than targeting cellular behavior without a mechanistic basis.
Phosphopeptide binding helps researchers examine how phosphorylation-dependent interactions regulate DNA damage responses. Changes in these contacts may alter the recruitment or activity of signaling proteins involved in responding to damage. Studying the interactions provides a molecular way to investigate how cancer cells rewire damage-response pathways, linking phosphorylation patterns to broader mechanisms of oncogenesis and therapeutic interest.