Impact of denaturation with urea on recombinant apolipoprotein A-IMilano ion-exchange adsorption: equilibrium uptake behavior and protein mass transfer kinetics.
| Title: | Impact of denaturation with urea on recombinant apolipoprotein A-IMilano ion-exchange adsorption: equilibrium uptake behavior and protein mass transfer kinetics. |
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| Authors: | Hunter AK; Pfizer Inc., Global Biologics, Chesterfield, MO, USA. alan.k.hunter@pfizer.com; Suda EJ; Das TK; Shell RE; Herberg JT; Ramasubramanyan N; Gustafson ME; Ho SV |
| Source: | Biotechnology journal [Biotechnol J] 2007 Jan; Vol. 2 (1), pp. 110-20. |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: Wiley-VCH Verlag Country of Publication: Germany NLM ID: 101265833 Publication Model: Print Cited Medium: Internet ISSN: 1860-7314 (Electronic) Linking ISSN: 18606768 NLM ISO Abbreviation: Biotechnol J Subsets: MEDLINE |
| Imprint Name(s): | Original Publication: Weinheim : Wiley-VCH Verlag, c2006- |
| MeSH Terms: | Apolipoprotein A-I/*analysis ; Apolipoprotein A-I/*chemistry ; Chromatography, Ion Exchange/*methods ; Urea/*chemistry ; Urea/*metabolism; Adsorption ; Humans ; Kinetics ; Protein Binding ; Protein Denaturation |
| Abstract: | We have studied the equilibrium uptake behavior and mass transfer rate of recombinant apolipoprotein A-I(Milano) (apo A-I(M)) on Q Sepharose HP under non-denaturing, partially denaturing, and fully denaturing conditions. The protein of interest in this study is composed of amphipathic alpha helices that serve to solubilize and transport lipids. The dual nature of this molecule leads to the formation of micellar-like structures and self association in solution. Under non-denaturing conditions equilibrium uptake is 134 mg/mL media and the isotherm is essentially rectangular. When fully denatured with 6 M urea, the equilibrium binding capacity decreases to 25 mg/mL media and the isotherm becomes less favorable. The decrease in both binding affinity and media capacity when the protein is completely denatured with 6 M urea can be explained by the loss of all alpha helical structure. The rate of apo A-I(M) mass transfer on Q Sepharose HP was characterized using a macropore diffusion model. Results of modeling studies indicate that effective pore diffusivity increases from 4.5 x 10(-9) cm2/s in the absence of urea to 6.0 x 10(-8) cm2/s when apo A-I(M) is fully denatured with 6 M urea. Based on light-scattering data reported for apo A-I, protein self association appears to be the dominant cause of slow protein mass transfer observed under non-denaturing conditions. |
| Substance Nomenclature: | 0 (Apolipoprotein A-I); 8W8T17847W (Urea) |
| Entry Date(s): | Date Created: 20061201 Date Completed: 20070221 Latest Revision: 20131121 |
| Update Code: | 20260130 |
| DOI: | 10.1002/biot.200600165 |
| PMID: | 17136731 |
| Database: | MEDLINE |
Journal Article