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Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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ReAsH/FlAsH Labeling and Image Analysis of Tetracysteine Sensor Proteins in Cells

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Published on: August 31, 2011

Discriminating changes in protein structure using tyrosine conjugation.

Mahta Moinpour¹, Natalie K Barker², Lindsay E Guzman¹

¹Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona, USA.

Protein Science : a Publication of the Protein Society

|June 3, 2020

Summary

This summary is machine-generated.

Researchers developed a new method to detect different protein shapes using tyrosine conjugation with PTAD. This technique helps differentiate protein conformational states by analyzing labeling patterns.

Keywords:

conjugation low complexity protein folding triazolinediones tyrosine

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Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

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Published on: July 20, 2016

Area of Science:

Biochemistry
Chemical Biology
Protein Engineering

Background:

Chemical modification of proteins is vital for developing therapies, biopharmaceutics, molecular probes, and biomaterials.
Understanding protein conformational states is crucial for their function and application.

Purpose of the Study:

To explore a conjugation-based approach for sensing alternative protein conformational states.
To investigate the utility of labeling tyrosine residues with 4-phenyl-3H-1,2,4-triazole-3,5(4H)-dione (PTAD) for distinguishing protein conformations.

Main Methods:

Conjugation of tyrosine residues in bovine serum albumin (BSA) with PTAD.
Quantification of labeled tyrosine residues using liquid chromatography with tandem mass spectrometry (LC-MS/MS).
Application of the method to BSA in alternative conformations induced by urea.

Main Results:

The amount of PTAD labeling on tyrosine residues correlated with their depth relative to the protein surface.
Distinct labeling patterns were observed for different conformational states of BSA.
The study successfully distinguished alternative protein conformations using this labeling strategy.

Conclusions:

Tyrosine conjugation with PTAD serves as a novel analytical tool for differentiating protein conformational states.
This method offers a new approach to probe protein structure and dynamics.