Kinase Phosphorylation
Kinase Phosphorylation - Related Videos
02:54
Protein Kinases and Phosphatases
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2020
Proteins undergo chemical modifications that trigger changes in the charge, structure, and conformation of the proteins. Phosphorylation, acetylation, glycosylation, nitrosylation, ubiquitination, lipidation, methylation, and proteolysis are various protein modifications that regulate protein activity. Such modifications are usually enzyme-driven. Protein kinases Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
12:26
Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Cited by 10 •
2018
Cyclin-dependent kinase 1 (Cdk1) is activated in the G2 phase of the cell cycle and regulates many cellular pathways. Here, we present a protocol for an in vitro kinase assay with Cdk1, which allows the identification of Cdk1-specific phosphorylation sites for establishing cellular targets of this important kinase.
09:16
Oligopeptide Competition Assay for Phosphorylation Site Determination
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Cited by 3 •
2017
Peptide competition assays are widely used in a variety of molecular and immunological experiments. This paper describes a detailed method for an in vitro oligopeptide-competing kinase assay and the associated validation procedures, which may be useful to find specific phosphorylation sites.
06:09
Assaying the Kinase Activity of LRRK2 in vitro
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Cited by 3 •
2012
Leucine Rich Repeat Kinase 2 is a large multidomain kinase, mutations in which are the most common genetic cause of Parkinson's disease. Analysis of the kinase activity of this protein has proven to be a crucial tool in understanding the biology and dysfunction of this protein. In this paper, in vitro assaying of the kinase activity of LRRK2 and a selection of its mutants is described, providing an experimental system to examine phosphorylation of putative substrates and potential dysfunction...
11:13
Identification of Kinase-substrate Pairs Using High Throughput Screening
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Cited by 1 •
2015
Protein phosphorylation is a central feature of how cells interpret and respond to information in their extracellular milieu. Here, we present a high throughput screening protocol using kinases purified from mammalian cells to rapidly identify kinases that phosphorylate a substrate(s) of interest.
FAQs
ATP serves as the phosphate donor, allowing a kinase to attach the group covalently to a selected substrate residue. The relevant targets commonly include serine, threonine, and tyrosine, so the modification can be studied in relation to distinct protein functions. Because attachment may change molecular shape, interactions, localization, or stability, ATP-dependent transfer connects the chemical reaction to cellular consequences.
The modified residue helps determine how a substrate responds to phosphorylation. Kinase phosphorylation typically targets serine, threonine, or tyrosine, and attachment at these sites can influence a protein’s shape, interactions, localization, or stability. Consequently, identifying the residue provides a way to connect a molecular modification with the particular functional change observed in a cellular pathway.
Reversibility allows phosphorylation-dependent regulation to change as cellular conditions change, rather than permanently fixing a substrate in one functional state. This flexibility supports coordinated control of signaling, metabolism, gene regulation, and cell-cycle progression. In biology, the reversible nature of the modification is therefore important because it enables dynamic pathway regulation and helps explain how cells adjust protein activity over time.
Kinase phosphorylation contributes to several major areas of cell biology, including cell signaling, metabolism, gene regulation, and progression through the cell cycle. Its effects on protein activity and interactions allow one modification to influence broader cellular programs. Examining these connections helps researchers place individual phosphorylation events within the larger pathways that coordinate cellular behavior.
Research on kinase phosphorylation can reveal how cellular pathways operate and identify mechanisms associated with disease. Investigators can examine how changes in phosphorylation-related regulation affect protein function, pathway activity, or cellular control. These findings provide biological context for distinguishing normal regulation from abnormal processes and for determining which pathway changes may be relevant to disease development.
Because abnormal kinase activity can contribute to disease-related biology, studying its phosphorylation mechanisms can identify points where pathway regulation might be altered. This knowledge supports the development of targeted therapies designed to modulate abnormal kinase activity rather than broadly affecting unrelated cellular processes. The approach links molecular understanding of phosphorylation with therapeutic strategies focused on specific biological pathways.