Related Experiment Video
Updated: Jun 19, 2026
06:56
Development and Application of Rapamycin-regulated Tyrosine Phosphatases
Published on: September 6, 2024
Physiological signaling specificity by protein tyrosine phosphatases
Matthew Soulsby1, Anton M Bennett
1Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut, USA.
Physiology (Bethesda, Md.)
|October 10, 2009
Summary
Protein tyrosine phosphatases (PTPs) precisely regulate cell growth, differentiation, and movement. This review explores how PTPs achieve signaling specificity through their domains and regulatory mechanisms for unique physiological responses.
Area of Science:
- Biochemistry
- Cell Biology
- Molecular Signaling
Background:
- Protein tyrosine phosphatases (PTPs) are crucial enzymes in cellular signaling pathways.
- Initially perceived as less specific than kinases, PTPs are now understood to play precise regulatory roles.
- PTPs are involved in fundamental biological processes including cell growth, differentiation, apoptosis, and motility.
Purpose of the Study:
- To review the concept of signaling specificity exhibited by PTPs.
- To elucidate the mechanisms underlying PTPs' precise regulation of biological processes.
- To highlight how intrinsic PTP domain differences and regulatory modes confer unique physiological functions.
Main Methods:
- Literature review focusing on PTP signaling.
- Analysis of PTP domain structures and functions.
- Examination of PTP regulatory mechanisms (e.g., post-translational modifications, protein-protein interactions).
Main Results:
- PTPs demonstrate remarkable signaling specificity.
- Intrinsic differences within PTP domains contribute to this specificity.
- Diverse regulatory modes further enhance PTPs' capacity for precise physiological control.
Conclusions:
- PTPs are key regulators of cellular functions, exhibiting high specificity.
- Signaling specificity arises from both PTP domain characteristics and regulatory networks.
- Understanding PTP specificity is vital for deciphering complex cellular processes and developing targeted therapies.
Related Concept Videos
01:22Amplifying Signals via Enzymatic Cascade
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
01:27Transducer Mechanism: Enzyme-Linked Receptors
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
02:54Protein Kinases and Phosphatases
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...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
02:54Protein Kinases and Phosphatases
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...
Protein kinases
Many proteins in the cell are regulated by phosphorylation, the addition of a phosphate group. A family of enzymes called kinases...
01:15Amplifying Signals via Second Messengers
Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
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,...