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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.
Protein kinases
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ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
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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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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Structural-Energetic Basis for Coupling between Equilibrium Fluctuations and Phosphorylation in a Protein Native

Hemashree Golla1, Adithi Kannan1, Soundhararajan Gopi1

  • 1Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036, India.

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Summary

Protein dynamics influence function. We found that altering charge interactions in the FF1 domain (a protein fragment) affects its conformation and phosphorylation, revealing a gating mechanism for protein function.

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Area of Science:

  • Protein dynamics and conformational ensembles
  • Molecular mechanisms of protein phosphorylation
  • Structural biology and biophysics

Background:

  • Protein function is intrinsically linked to conformational fluctuations within the native ensemble.
  • Understanding how structural-energetic features dictate these fluctuations and protein output is complex due to multiple variables.
  • The FF1 domain of human p190A RhoGAP protein is crucial for the transcriptional activity of transcription factor TFII-I via phosphorylation of a buried tyrosine.

Purpose of the Study:

  • To elucidate the molecular underpinnings of phosphorylation for a buried tyrosine in the FF1 domain.
  • To investigate the role of charge-charge interactions in modulating protein conformational dynamics and phosphorylation competence.
  • To establish a mechanism by which protein structure influences functional output.

Main Methods:

  • Utilized a multidisciplinary approach including spectroscopy, calorimetry, and molecular simulations.
  • Performed statistical-mechanical modeling and in vitro phosphorylation assays.
  • Employed site-directed mutagenesis (K53E, K53Q) to probe charge-charge interactions.

Main Results:

  • The FF1 domain exhibits a diverse conformational ensemble, with some states being phosphorylation-competent.
  • Mutations disrupting unfavorable charge-charge interactions (K53E, K53Q) led to reduced phosphorylation extents.
  • These mutations resulted in altered structural coupling, damped equilibrium fluctuations, and a more compact native ensemble.

Conclusions:

  • A conformational selection mechanism governs phosphorylation in the FF1 domain, with residue K53 acting as a gatekeeper.
  • Unfavorable charge-charge interactions play a critical role in regulating protein function by modulating native ensemble characteristics.
  • This modulation of native ensemble properties by charge interactions may be a widespread feature in ordered protein domains.