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Intrinsically Disordered Proteins02:18

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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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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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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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Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
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Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
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Nonfouling Coatings from Synthetic Intrinsically Disordered Proteins.

Chuanbao Zheng1,2,3, Yulia Shmidov3, Anastasia K Varanko3

  • 1Physical Chemistry and Soft Matter, Wageningen University & Research, Wageningen, 6708WE, The Netherlands.

Small (Weinheim an Der Bergstrasse, Germany)
|June 30, 2025
PubMed
Summary
This summary is machine-generated.

Optimized B-M-E protein brushes create a robust, nonfouling gold surface coating. This advanced biomaterial offers performance comparable to synthetic coatings and resists bacterial attachment.

Keywords:
antifoulinggold surfacehuman serumintrinsically disordered polypeptidessolid‐binding peptides

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Protein Engineering

Background:

  • Antifouling coatings are crucial for preventing unwanted surface interactions.
  • Existing synthetic polymers and small molecules have limitations in performance and biocompatibility.
  • Triblock proteins offer a potential platform for developing advanced biomaterials.

Purpose of the Study:

  • To optimize the antifouling performance of a previously developed B-M-E triblock protein.
  • To engineer a nonfouling protein layer on gold surfaces by modifying the E block sequence.
  • To evaluate the performance of the optimized B-M-E protein as a robust antifouling coating.

Main Methods:

  • Screening of intrinsically disordered proteins (IDPs) for nonfouling properties.
  • Modification of the E block in the B-M-E protein with a selected IDP sequence: [(GAGAIP)3-(GAGEIP)]4.
  • Self-assembly of the modified B-M-E protein onto gold surfaces to form protein brushes.
  • Characterization of the nonfouling performance and bacterial resistance of the protein coating.

Main Results:

  • An optimized B-M-E protein with an E block sequence of [(GAGAIP)3-(GAGEIP)]4 was developed.
  • The resulting B-M-E protein brushes formed a nonfouling layer on gold surfaces.
  • The antifouling performance was comparable to self-assembled monolayers (SAMs) of tetraethylene glycol-terminated alkanethiols.
  • The protein-coated gold surfaces demonstrated resistance to E. coli attachment for at least seven days.

Conclusions:

  • The engineered B-M-E protein provides an effective and scalable nonfouling coating for gold surfaces.
  • This protein-based coating offers a robust alternative to conventional synthetic antifouling materials.
  • The study highlights the potential of intrinsically disordered proteins in biomaterial design for surface functionalization.