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Intrinsically Disordered Proteins02:18

Intrinsically Disordered Proteins

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Intrinsically disordered proteins are a group of proteins that do not fold into specific three-dimensional structures. Their structural flexibility allows them to complement ordered proteins to perform functions that are inaccessible to rigid structures. They are more common in eukaryotes than prokaryotes and may either be exclusively intrinsically disordered or hybrid proteins, consisting of a mix of ordered and disordered regions. The absence of a rigid structure in these proteins can be...
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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Protein conformational dynamics and phenotypic switching.

Prakash Kulkarni1, Srisairam Achuthan2, Supriyo Bhattacharya3

  • 1Department of Medical Oncology and Therapeutics Research, City of Hope National Medical Center, Duarte, CA 91010 USA.

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|January 21, 2022
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Summary
This summary is machine-generated.

Intrinsically disordered proteins (IDPs) regulate cellular information flow through dynamic interactions. Their inherent plasticity and "conformational noise" enable cells to adapt and make decisions, as exemplified by PAGE4 in prostate cancer.

Keywords:
Conformational noiseIntrinsically disordered proteinsMRK hypothesisPAGE4Phenotypic switchingProtein conformational dynamics

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Area of Science:

  • Biochemistry
  • Systems Biology
  • Cellular Biology

Background:

  • Intrinsically disordered proteins (IDPs) lack stable 3D structures, existing as flexible ensembles.
  • IDPs' structural plasticity allows diverse interactions, forming scale-free protein interaction networks (PINs).
  • IDPs often act as hubs in cellular PINs, influencing information flow and cellular responses.

Purpose of the Study:

  • To investigate the role of intrinsically disordered proteins (IDPs) in cellular information processing and decision-making.
  • To elucidate the function of the intrinsically disordered protein PAGE4 in phenotypic switching of prostate cancer cells.
  • To establish a systems-level understanding of how IDP conformational dynamics and noise impact cellular behavior.

Main Methods:

  • Utilized a combination of experimental and computational techniques.
  • Focused on PAGE4 as a model intrinsically disordered protein.
  • Analyzed protein interaction networks (PINs) and conformational dynamics.

Main Results:

  • IDPs contribute to "conformational noise" distinct from transcriptional noise.
  • Upregulation of IDPs under stress increases stochastic interactions, activating pathways or rewiring PINs.
  • PAGE4 plays a critical role in the phenotypic switching of prostate cancer cells.

Conclusions:

  • IDP conformational dynamics and noise are crucial for cellular decision-making.
  • PAGE4 exemplifies how IDPs regulate information flow and cellular adaptation.
  • A systems-level framework is provided for understanding IDP roles in cellular regulation.