Abstract
Amino acid analysis of proteins is one of the best and most accurate methodologies to quantify proteins. Ideally, samples should be pure prior to hydrolysis, however, they are often not only at low concentration, but also in buffers, salts, and/or detergents. Sample contaminants contribute to background noise that hampers amino acid analysis, variably affecting recoveries of individual amino acids (1). The necessity to obtain samples in high concentration and free of contaminants is a problem for protein quantitation and structural characterization (see Note 1). Many of the existing methods for removing buffers and salts from proteins, such as precipitation methods or reverse-phase high-performance liquid chromatography (RP-HPLC) result in variable and unacceptably high losses of protein (see Note 2), making an assessment of the true concentration difficult. In this chapter, we describe two methods commonly used to recover proteins from buffers: a gel filtration method, Ultra microspin columns, and adsorption to a polyvinylidene difluoride (PVDF) membrane in the ProSorb sample preparation cartridge from Applied Biosystems. Both methods work well, with somewhat better recoveries for the gel filtration method.
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References
Dupont D. R., Keim P. S., Chui A. H., Bello R., Bozzini M., and Wilson K. J. (1989) A comprehensive approach to amino acid analysis, in Techniques in Protein Chemistry (Hugli T. E., ed.). Academic London and New York, pp. 284–294.
Instructions for UltraMicro spin column, Amika Corp.
West K. A. and Crabb J. W. (1992) Application of automatic PTC amino acid analysis, in Techniques in Protein Chemistry III (Angeletti R. H., ed.), Academic London and New York, pp. 233–242.
Gharahdaghi F. Atherton D. DeMott M. Mische S. M. (1992)Amino acid analyis of PVDF bound proteins in Techniques in Protein Chemistry III (Angeletti R. H. ed.) Academic London and New York pp. 249–260
Gilman L. B. and Woodward C. (1990) Hydrolysis methods in current research, in Protein Chemistry (Villafranca J. J., ed.), Academic London and New York, pp. 23–26.
Crabb J. W., West K. A., Dodson W. S., and Hulmes J. D. (1997) Amino Acid Analysis in Current Protocols in Protein Science (Coligan J. E., Dunn B. M., Ploegh H. L., Speicher D. W., and Wingfield P. T., eds.), Wiley New York, pp. 11.9.1–11.9.42.
Hunziker P., Anderson T. T., Bao Y., Cohen S. A., Denslow N. D., Hulmes J. D., et al. (1999) Identification of proteins electroblotted to polyvinylidene difluoride membrane by combined amino acid analysis and bioinformatics: an ABRF Multicenter Study. J. Biomolecular Techniques 10, 129–136.
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© 2001 Humana Press Inc.
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Zhang, L., Denslow, N. (2001). Purification of Proteins Using UltraMacro Spin Columns or ProSorb Sample Preparation Cartridges for Amino Acid Analysis. In: Cooper, C., Packer, N., Williams, K. (eds) Amino Acid Analysis Protocols. Methods in Molecular Biology™, vol 159. Humana Press. https://doi.org/10.1385/1-59259-047-0:031
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DOI: https://doi.org/10.1385/1-59259-047-0:031
Publisher Name: Humana Press
Print ISBN: 978-0-89603-656-7
Online ISBN: 978-1-59259-047-6
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