Deciphering Polyphenol Interactions with Poly(L-proline) and Polysarcosine
Haoran Cai1, Zhen Zhu2,3, Zhengchu Zhang1
1Beijing National Laboratory for Molecular Sciences, Center for Soft Matter Science and Engineering, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Biomacromolecules
|June 10, 2026
Summary
Natural polyphenols bind strongly to both rigid poly(L-proline) and flexible polysarcosine. This study reveals distinct thermodynamic binding profiles and develops a polyphenol-polypeptide hydrogel.
Area of Science:
- Biochemistry
- Polymer Science
- Materials Science
Background:
- Natural polyphenols extensively interact with proteins, particularly proline-rich proteins (PRPs).
- The precise molecular role of proline's structural rigidity in these interactions is not fully understood.
Purpose of the Study:
- To investigate the binding interactions between natural polyphenols and polypept(o)ides.
- To delineate the role of backbone flexibility in polyphenol-polypeptide interactions using minimalist models.
- To develop novel materials based on these interactions.
Main Methods:
- Utilized poly(L-proline) (PLP) and polysarcosine (PSar) as conformationally distinct models.
- Employed isothermal titration calorimetry (ITC) for thermodynamic analysis.
- Conducted molecular dynamics (MD) simulations to study binding modes.
- Fabricated a hydrogel using epigallocatechin gallate (EGCG) and star-shaped PSar polymers.
Main Results:
- Both rigid PLP and flexible PSar demonstrated strong, micromolar-level binding affinities for polyphenols.
- Binding modes exhibited different thermodynamic profiles: PLP binding was enthalpically and entropically driven, while PSar binding incurred a conformational entropy penalty.
- A novel hydrogel with unique assembly and sustained release properties was successfully fabricated.
Conclusions:
- Established a unified thermodynamic framework for polyphenol-polypeptide interactions.
- Demonstrated that backbone flexibility significantly influences binding thermodynamics.
- Highlighted the potential of polyphenol-polypeptide interactions for advanced material design.
Related Concept Videos
01:15Cellulose and Pectic Polysaccharides
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
As a cell matures, its cell wall specializes according to its type. For example, the parenchyma cells of...
01:25Protein Glycosylation
Glycosylation, the most common post-translational modification for proteins, serves diverse functions. Adding sugars to proteins makes the proteins more resistant to proteolytic digestion. Glycosylated proteins can act as markers and receptors to promote cell-cell adhesion. Additionally, they have many essential quality control functions in the cell, such as correct protein folding and facilitating transport of misfolded proteins to the cytosol, which can be degraded.
Glycosylation occurs in...
Glycosylation occurs in...
01:26Biosynthesis of Polysaccharides
Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
01:24Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.
02:04Protein-protein Interfaces
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 polypeptide...
01:19Phase II Reactions: Sulfation and Conjugation with α-Amino Acids
Sulfation and α-amino acid conjugation are two critical biotransformation reactions in drug metabolism. Sulfation, a phase II biotransformation reaction, involves adding a polar sulfate group to a drug, enhancing its water solubility and promoting excretion. This process can either co-occur with or occur independently of glucuronidation. Nonmicrosomal sulfotransferase enzymes catalyze the process. The reaction involves 3'-phosphoadenosine-5'-phosphosulfate or PAPS coenzyme activation, sulfur...