Title

Two-Dimensional Infrared Spectroscopy of Azido-Nicotinamide Adenine Dinucleotide in Water.

Funding Source

National Science Foundation, National Institutes of Health, Bloom's Syndrome Foundation

Grant Number

R01 GM65368,CHE-0644410, R01 GM79368, CHE-0715448,2007256

Department

Department of Chemistry

Document Type

Article

Publication Date

8-7-2011

Abstract

Mid-IR active analogs of enzyme cofactors have the potential to be important spectroscopic reporters of enzyme active site dynamics. Azido-nicotinamide adenine dinucleotide (NAD+), which has been recently synthesized in our laboratory, is a mid-IR active analog of NAD +, a ubiquitous redox cofactor in biology. In this study, we measure the frequency-frequency time correlation function for the antisymmetric stretching vibration of the azido group of azido-NAD+ in water. Our results are consistent with previous studies of pseudohalides in water. We conclude that azido-NAD+ is sensitive to local environmental fluctuations, which, in water, are dominated by hydrogen-bond dynamics of the water molecules around the probe. Our results demonstrate the potential of azido-NAD+ as a vibrational probe and illustrate the potential of substituted NAD+-analogs as reporters of local structural dynamics that could be used for studies of protein dynamics in NAD-dependent enzymes.

Comments

DOI: 10.1063/1.3623418

PubMed ID: 21823737

Funding text

This work was supported by NIH R01 GM79368 and NSF CHE-0644410 (C.M.C.), and NIH R01 GM65368, BSF (2007256), and NSF CHE-0715448 (A.K.).

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