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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 stands for...
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Intact Transition Epitope Mapping-Force Interferences by Variable Extensions (ITEM-FIVE).

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Summary
This summary is machine-generated.

Investigating protein complex stability, this study used mass spectrometry to analyze biotinylated T4 fibritin foldon (T4Ff) trimers. Intrinsically disordered regions (IDRs) attached to T4Ff altered binding strengths, revealing insights into protein complex dynamics.

Keywords:
ESI-MSITEM mass spectrometrybinding strengthbio-computationfoldonintrinsically disordered regionsmolecular dynamicsnon-covalent complex

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Area of Science:

  • Biochemistry
  • Biophysics
  • Structural Biology

Background:

  • Non-covalent protein complex stability is crucial for biological function.
  • Intrinsically disordered regions (IDRs) are known to influence protein complex dynamics.
  • Understanding how IDRs modulate binding strength is essential for protein engineering and drug design.

Purpose of the Study:

  • To investigate the impact of intrinsically disordered regions (IDRs) on the binding strength of non-covalent protein complexes.
  • To quantify the energy differences in dissociation reactions of modified T4 fibritin foldon (T4Ff) trimers.
  • To elucidate the role of entropic spring effects and transition state modulation by IDRs.

Main Methods:

  • Mass spectrometry was employed to determine apparent enthalpies of gas phase dissociation reactions.
  • T4 fibritin foldon (T4Ff) and its biotinylated variants were used as model systems.
  • Molecular dynamics simulations were performed to analyze trimer ground states and transition states.

Main Results:

  • Apparent dissociation enthalpies varied significantly between homo- and hetero-trimeric biotinylated T4Ff complexes.
  • Homo-trimers (F-F-F and bF-bF-bF) showed similar dissociation enthalpies (3.32 kJ/mol and 3.85 kJ/mol).
  • Hetero-trimers (F-F-bF and F-bF-bF) exhibited lower enthalpies (1.86 kJ/mol and 1.08 kJ/mol), attributed to IDR-induced asymmetries in transition states and entropic spring effects.

Conclusions:

  • Biotinylation of T4Ff, mimicking IDRs, significantly modulated the binding strength of protein complexes.
  • Entropic spring effects and transition state asymmetries play key roles in stabilizing or destabilizing protein complexes containing IDRs.
  • The study demonstrates a method for semi-quantitative determination of energy differences in complex dissociation reactions modulated by IDRs.