کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7619299 | 1494162 | 2009 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Affinity ligands for immunoglobulins based on the multicomponent Ugi reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
This report describes a novel use of the four-component Ugi reaction to generate a solid-phase library suitable for the purification of immunoglobulins and their fragments by affinity chromatography. An aldehyde-functionalised Sepharose⢠solid-support constituted one component in the four-component reaction, whereas the other three components (a carboxylic acid, a primary or secondary amine and an isonitrile) were varied in a combinatorial fashion to generate a tri-substituted peptoidal scaffold structure which provides a degree of rigidity and functionality suitable for rational investigation of immunoglobulin binding. The Ugi ligand library was initially screened chromatographically against whole human IgG and its fragments (Fc and Fab) to yield a Fab-specific lead ligand based on its ability to bind Fab differentially over Fc. Preparative chromatography of IgG from human serum showed 100% of IgG was adsorbed from the 20 mg/ml crude stock and subsequently eluted with a purity of 81.0% as determined by SDS-PAGE analysis under non-optimised conditions. High purity Fab and IgG isolation was achieved from both yeast and E. coli host cell proteins according to silver-stained SDS-PAGE lane densitometry. The ligand density and spacer-arm chemistry of the immobilised ligand was optimised to define an affinity adsorbent which binds 73.06 mg IgG/ml moist gel (dynamic binding capacity at 10% breakthrough) and a static binding capacity of 16.1 ± 0.25 mg Fab/ml moist resin displaying an affinity constant Kd = (2.6 ± 0.3) Ã 10â6 M. The lead candidate was modelled in silico and docked into a human Fab fragment (PDB: 1AQK) to suggest a putative binding interface to the constant CH1-CL Fab terminal through six defined hydrogen bond interactions together with putative hydrophobic interactions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography B - Volume 877, Issues 14â15, 15 May 2009, Pages 1440-1452
Journal: Journal of Chromatography B - Volume 877, Issues 14â15, 15 May 2009, Pages 1440-1452
نویسندگان
Jonathan M. Haigh, Abid Hussain, Michael L. Mimmack, Christopher R. Lowe,