Perfluoroalkyl Chains Direct Novel Self-Assembly of Insulin
摘要:
The self-assembly of biopharmaceutical peptides into multimeric, nanoscale objects, as well as their disassembly to monomers, is central for their mode of action. Here, we describe a bioorthogonal strategy, using a non-native recognition principle, for control of protein self-assembly based on intermolecular fluorous interactions and demonstrate it for the small protein insulin. Perfluorinated alkyl chains of varying length were attached to desB30 human insulin by acylation of the E-amine of the side-chain of LysB29. The insulin analogues were formulated with Zn-II and phenol to form hexamers. The self-segregation of fluorous groups directed the insulin hexamers to self-assemble. The structures of the systems were investigated by circular dichroism I (CD) spectroscopy and synchrotron small-angle X-ray scattering. Also, the binding affinity to the 4 insulin receptor was measured. Interestingly, varying the length of the perfluoroalkyl chain provided three different scenarios for self-assembly; the short chains hardly affected the native hexameric structure, the medium-length chains induced fractal-like structures with the insulin hexamer as the fundamental building block, while the longest chains lead to the formation of structures with local cylindrical geometry. This hierarchical self-assembly system, which combines Zn-II mediated hexamer formation with fluorous interactions, is a promising tool to control the formation of high molecular weight complexes of insulin and potentially other proteins.
[EN] FLUORINATED HYDROPHOBIN AND USES THEREOF<br/>[FR] HYDROPHOBINE FLUORÉE ET SES UTILISATIONS
申请人:FOND ISTITUTO ITALIANO DI TECNOLOGIA
公开号:WO2013080133A1
公开(公告)日:2013-06-06
Modified protein comprising a molecule of hydrophobin and at least one fluorocarbon group bound covalently to an amino acid of hydrophobin, obtainable by reaction of a hydrophobin with a fluorinated compound of formula: Y-RH-RF, in which Y is a functional group capable of reacting with an amino acid residue of the hydrophobin forming a covalent bond between the fluorinated compound and said amino acid of the hydrophobin, RH is an optional hydrocarbon group, non-fluorinated, aliphatic and/or aromatic, optionally including heteroatoms, and RF is a fluorinated or perfluorinated hydrocarbon residue, linear, branched or cyclic, optionally including one or more heteroatoms.
Perfluoroalkyl Chains Direct Novel Self-Assembly of Insulin
作者:Leila Malik、Jesper Nygaard、Rasmus Hoiberg-Nielsen、Lise Arleth、Thomas Hoeg-Jensen、Knud J. Jensen
DOI:10.1021/la203042c
日期:2012.1.10
The self-assembly of biopharmaceutical peptides into multimeric, nanoscale objects, as well as their disassembly to monomers, is central for their mode of action. Here, we describe a bioorthogonal strategy, using a non-native recognition principle, for control of protein self-assembly based on intermolecular fluorous interactions and demonstrate it for the small protein insulin. Perfluorinated alkyl chains of varying length were attached to desB30 human insulin by acylation of the E-amine of the side-chain of LysB29. The insulin analogues were formulated with Zn-II and phenol to form hexamers. The self-segregation of fluorous groups directed the insulin hexamers to self-assemble. The structures of the systems were investigated by circular dichroism I (CD) spectroscopy and synchrotron small-angle X-ray scattering. Also, the binding affinity to the 4 insulin receptor was measured. Interestingly, varying the length of the perfluoroalkyl chain provided three different scenarios for self-assembly; the short chains hardly affected the native hexameric structure, the medium-length chains induced fractal-like structures with the insulin hexamer as the fundamental building block, while the longest chains lead to the formation of structures with local cylindrical geometry. This hierarchical self-assembly system, which combines Zn-II mediated hexamer formation with fluorous interactions, is a promising tool to control the formation of high molecular weight complexes of insulin and potentially other proteins.