Structure, function, and stability of enzymes covalently attached to single-walled carbon nanotubes

Prashanth Asuri, Shyam Sundhar Bale, Ravindra C. Pangule, Dhiral A. Shah, Ravi S. Kane, Jonathan S. Dordick

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

We describe the structure, activity, and stability of enzymes covalently attached to single-walled carbon nanotubes (SWNTs). Conjugates of SWNTs with three functionally unrelated enzymes - horseradish peroxidase, subtilisin Carlsberg, and chicken egg white lysozyme-were found to be soluble in aqueous solutions. Furthermore, characterization of the secondary and tertiary structure of the immobilized proteins by circular dichroism and fluorescence spectroscopies, respectively, and determination of enzyme kinetics revealed that the enzymes retained a high fraction of their native structure and activity upon attachment to SWNTs. The SWNT-enzyme conjugates were also more stable in guanidine hydrochloride (GdnHCI) and at elevated temperatures relative to their solution counterparts. Thus, these protein conjugates represent novel preparations that possess the attributes of both soluble enzymes-high activity and low diffusional resistance-and immobilized enzymes-high stability-making them attractive choices for applications ranging from diagnostics and sensing to drug delivery.

Original languageEnglish
Pages (from-to)12318-12321
Number of pages4
JournalLangmuir
Volume23
Issue number24
DOIs
StatePublished - 20 Nov 2007
Externally publishedYes

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