Stimuli-Responsive Polyguanidino-Oxanorbornene Membrane Transporters as Multicomponent Sensors in Complex Matrices
摘要:
We introduce guanidinium-containing synthetic polymers based on polyguanidino-oxanorbornenes (PGONs) as anion transporters in lipid bilayers that can be activated and inactivated by chemical stimulation. According to fluorogenic anion export experiments with vesicles, PGON transporters are most active in neutral bilayers near their phase transition, with EC50's in the nanomolar range. Six times higher effective transporter concentrations were measured with aminonaphthalene-1,3,6-trisulfonate than with 5(6)-carboxyfluorescein, demonstrating the importance of anion binding for transport and excluding nonspecific efflux. Negative surface potentials efficiently annihilate transport activity, while inside-negative membrane potentials slightly increase it. These trends demonstrate the functional importance of counterions to hinder the binding of hydrophilic counterions and to minimize the global positive charge of the transporter-counterion complexes. Strong, nonlinear increases in activity with polymer length reveal a significant polymer effect. Overall, the characteristics of PGONs do not match those of similar systems (for example, polyarginine) and hint toward an interesting mode of action, clearly different from nonspecific leakage caused by detergents. The activity of PGONs increases in the presence of amphiphilic anions such as pyrenebutyrate (EC50 = 70 mu M), while several other amphiphilic anions tested were inactive. PGONs are efficiently inactivated by numerous hydrophilic anions including ATP (IC50 = 150 mu M), ADP (IC50 = 460 mu M), heparin (IC50 = 1.0 mu M), phytate (IC50 = 0.4 mu M), and CB hydrazide (IC50 = 26 mu M). The compatibility of this broad responsiveness with multicomponent sensing in complex matrices is discussed and illustrated with lactate sensing in sour milk. The PGON lactate sensor operates together with lactate oxidase as a specific signal generator and CB hydrazide as an amplifier for covalent capture of the pyruvate product as CB hydrazone (IC50 = 1.5 mu M).
Protein Transduction Domain Mimics: The Role of Aromatic Functionality
作者:Abhigyan Som、Anika Reuter、Gregory N. Tew
DOI:10.1002/anie.201104624
日期:2012.1.23
For better or worse: Proteintransductiondomainmimics built from synthetic polymers demonstrate that aromatic side chains provide better transduction than aliphatic groups at the same relative hydrophobicity. Similarly, a less hydrophobic aromatic side chain is more active than the corresponding aliphatic one containing the same number of carbon atoms (see picture).
The invention generally relates to synthetic mimics of cell penetrating peptides. More particularly, the invention relates to certain novel monomers, oligomers and polymers (e.g., co-polymers) that are useful for the preparation of synthetic mimics of cell penetrating peptides, their compositions, preparations and use.
Effects of sidechain isomerism on polymer-based non-covalent protein delivery
作者:Alfonso Barrios、Mario Milan、Elianny Perozo、Md Lokman Hossen、Prem Chapagain、Joong Ho Moon
DOI:10.1039/d2cc02343a
日期:——
Polymer sidechain isomerism significantly influences intracellular protein delivery due to altered planarity of the functional group.
由于侧链异构化引起的功能团平面性改变,聚合物侧链异构化显著影响细胞内蛋白质输送。
Self-Activation in De Novo Designed Mimics of Cell-Penetrating Peptides
作者:Abhigyan Som、A. Ozgul Tezgel、Gregory J. Gabriel、Gregory N. Tew
DOI:10.1002/anie.201101535
日期:2011.6.27
Modified guanidine-containing polymers for biologic delivery
申请人:Moon Joong Ho
公开号:US11529315B1
公开(公告)日:2022-12-20
The subject invention provides materials and methods for intracellular deliver of molecules and/or therapeutic agents. The subject invention also provides methods for synthesizing polymeric systems and nanomaterials that enhance or assist the passage of molecules and/or therapeutic agents across biological membranes. The compound, polymer or nanoparticle of the subject invention comprises a modified guanidine moiety in a plurality of repeating units of a polymer or on the surface of a nanoparticle where the guanidine moiety comprises, for example, a carbamoyl or thiourea modification. The polymer or nanoparticle can be used in a cancer treatment formulation.