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Controlled structure in artificial protein hydrogels

Kennedy, Scott B. and Littrell, Kenneth and Thiyagarajan, P. and Tirrell, David A. and Russell, Thomas P. (2005) Controlled structure in artificial protein hydrogels. Macromolecules, 38 (17). 7470-7475 . ISSN 0024-9297. doi:10.1021/ma050726l.

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Small-angle X-ray scattering (SAXS) and circular dichroism (CD) were used to study the structure of artificial, multidomain protein hydrogels. Preliminary sedimentation equilibrium results indicate that the flanking leucine zipper domains used in the design of the artificial multidomain protein form tetrameric helical bundles. The leucine zipper domain alone precipitates at high concentrations (7% w/v) and near-neutral pH, but the multidomain protein remains soluble owing to a hydrophilic central domain. The resulting solution displays characteristic properties of physical gels. SAXS data from gels fit well to a cylindrical model with the following dimensions:  length 63 Å, radius 13.6 Å, and a 1 Å axial pore. These results match the dimensions of a tetrameric helical bundle and indicate that the low concentration equilibrium structure of the leucine zipper domain is maintained within the multidomain protein, even at high concentrations. Altogether, these results confirm a static picture of the gel structure where tetrameric self-associations of leucine zipper domains act as physical cross-links in the protein hydrogel.

Item Type:Article
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Tirrell, David A.0000-0003-3175-4596
Additional Information:Copyright © 2005 American Chemical Society. Received April 7, 2005; Revised Manuscript Received June 6, 2005. Publication Date (Web): July 21, 2005. This work was supported by the Materials Research Science and Engineering Center at the University of Massachusetts Amherst (DMR-9809365). The authors thank Paul Welch for assistance in the modeling and simulation of SAXS data and Soenke Seifert in the SAXS measurements. This work benefited from the use of BESSRC-CAT at APS and IPNS, funded by the U.S. DOE, BES under Contract W-31-109-ENG-38 to the University of Chicago.
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Department of Energy (DOE)W-31-109-ENG-38
Issue or Number:17
Record Number:CaltechAUTHORS:20150114-141719887
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Official Citation:Controlled Structure in Artificial Protein Hydrogels Scott B. Kennedy, Kenneth Littrell, P. Thiyagarajan, David A. Tirrell, and Thomas P. Russell Macromolecules 2005 38 (17), 7470-7475
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53732
Deposited By: Anne Hormann
Deposited On:16 Jan 2015 07:06
Last Modified:10 Nov 2021 20:06

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