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Related Concept Videos

Protein Kinases and Phosphatases02:54

Protein Kinases and Phosphatases

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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.
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The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
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The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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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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The central dogma explains the flow of genetic information from DNA nucleotides to the amino acid sequence of proteins.
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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells
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Recent Advances in Genetic Code Expansion Techniques for Protein Phosphorylation Studies.

Xuewen Qin1, Tao Liu1

  • 1State Key Laboratory of Natural and Biomimetic Drugs, Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Haidian District, Beijing 100191, China.

Journal of Molecular Biology
|December 20, 2021
PubMed
Summary

Genetic code expansion enables precise protein phosphorylation for studying cell signaling. This method allows homogeneous phosphorylation, crucial for understanding diseases linked to regulatory malfunctions.

Keywords:
aminoacyl-tRNA synthetasekinasenoncanonical amino acidsphosphatasepost-translational phosphorylation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Protein phosphorylation is a key posttranslational modification regulating cell signaling.
  • Dysregulation of protein phosphorylation is implicated in various human diseases.
  • Studying phosphorylation requires methods for preparing homogeneously modified proteins.

Purpose of the Study:

  • To summarize recent advancements in using genetic code expansion for protein phosphorylation studies.
  • To highlight the utility of genetic code expansion in preparing homogeneously phosphorylated proteins.
  • To underscore the importance of studying protein phosphorylation for understanding cell signaling and disease.

Main Methods:

  • Utilizing genetic code expansion to introduce noncanonical amino acids site-specifically.
  • Employing nonsense codons to direct the incorporation of modified amino acids.
  • Applying this methodology in both Escherichia coli and mammalian cell systems.

Main Results:

  • Genetic code expansion provides a powerful tool for site-specific protein phosphorylation.
  • Homogeneously phosphorylated proteins can be prepared efficiently using this technique.
  • This method facilitates in-depth studies of protein phosphorylation and its regulatory mechanisms.

Conclusions:

  • Genetic code expansion is a valuable technique for advancing protein phosphorylation research.
  • This approach aids in elucidating the role of phosphorylation in cell signaling and disease pathogenesis.
  • Further development and application of genetic code expansion will enhance our understanding of posttranslational modifications.