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New Protein Folding Application Note Uses Wyatt Technology's Dynamic Light Scattering Technique - Wyatt Technology, with a new application note demonstrating the capability of its DynaPro dynamic light scattering instrument to monitor the dissociation of an oligomeric protein and unfolding of monomers simultaneously using chaotropic agents
New Protein Folding Application Note Uses Wyatt Technology's Dynamic Light Scattering Technique

 

PRZOOM - /newswire/ - Santa Barbara, CA, United States, 2008/09/15 - Wyatt Technology, with a new application note demonstrating the capability of its DynaPro dynamic light scattering instrument to monitor the dissociation of an oligomeric protein and unfolding of monomers simultaneously using chaotropic agents.

   
 
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Wyatt Technology, the world leader in absolute macromolecular characterization products, announces the publication of a new free-of-charge application note demonstrating the capability of its DynaPro dynamic light scattering instrument to monitor the dissociation of an oligomeric protein and unfolding of monomers simultaneously using chaotropic agents. The analysis of proteins is particularly important for the study of many diseases such as cancer, diabetes, cardiovascular disease and neurodegenerative diseases such as Alzheimer's.

The importance of protein folding and unfolding has long been recognized and is an active field of research. The main rules of protein folding/unfolding have been established from in vitro experiments and the information obtained can be related to the function and behavior of proteins in vivo. Unfolding of proteins in vitro can be induced chemically using chaotropic agents like guanidine hydrochloride or urea. Protein Y is a 16 kDa, almost fully helical human protein. At pH 5.0 it forms oligomers of different sizes. Studying the unfolding of protein Y by circular dichroism, the main transition in the secondary structure can be observed. The aim of this specific study was to follow the unfolding process by another independent method.

For this application, far UV CD spectra were taken at 25°C on an AVIV spectrophotometer using a 0.01 cm cell. 5 spectra were recorded with a step size of 1.0 nm, a bandwidth of 1.5 nm and an averaging time of 5 seconds.
Samples were prepared 3 hours before measurement to allow time for the unfolding. Protein concentration was 2 mg/ml. The inflexion point of the unfolding curve is at 2.6 M GnHCl by both methods. Dynamic light scattering was performed with a DynaPro using a 12?l quartz cuvette. Samples were filtered with a 0.01?m Whatman Anodisc-13 filter.

Data were analyzed with the easy-to-use Wyatt Dynamics software and 25-30 acquisitions were averaged. The main transition in secondary structure can be observed by estimating the Stokes radius of the protein under different concentrations of the chaotropic agent (Fig. 1.). The mid-point of the transition agrees exceptionally well with the CD data (2.6M GnHCl). However, applying DLS measurements it is possible to observe additional molecular events: the dissociation of oligomers in the 0-2 M GnHCl concentration range.

The results of the experiment clearly demonstrate that dynamic light scattering measurements are capable of quickly and easily monitoring the dissociation of an oligomeric protein and unfolding of monomers simultaneously using chaotropic agents.

About Wyatt
Based in Santa Barbara, California, Wyatt Technology is the world's leading provider of instruments for absolute macromolecular characterization. With over 35 years' experience developing multi-angle light scattering detectors, working with customers in the biotechnology, chemical, petrochemical, pharmaceutical, academic and government arenas, Wyatt prides itself on its entrepreneurial spirit, and the uniqueness of its offerings. The Company's groundbreaking technology and uncompromising levels of customer care make Wyatt the global hallmark in its field.

For further press information please contact: Laura Browne, The Scott Partnership, 1 Whiteside, Station Road, Holmes Chapel, Cheshire. CW4 8AA United Kingdom T: +44 1477 539539 F: +44 1477 539540 E: wyatt[.]scottpr.com.

 
 
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New Protein Folding Application Note Uses Wyatt Technology's Dynamic Light Scattering Technique

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Contact: Laura Browne 
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IMPORTANT INFORMATION: Issuance, publication or distribution of this press release in certain jurisdictions could be subject to restrictions. The recipient of this press release is responsible for using this press release and the information herein in accordance with the applicable rules and regulations in the particular jurisdiction. This press release does not constitute an offer or an offering to acquire or subscribe for any The Scott Partnership securities in any jurisdiction including any other companies listed or named in this release.

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