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Polarized Two-Photon Absorption and Heterogeneous Fluorescence Dynamics in NAD(P)H.

Thomas S Blacker1,2,3, Nick Nicolaou1, Michael R Duchen3

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This study uses polarized two-photon absorption to differentiate structural states of the NAD(P)H cofactor in biological systems. Findings reveal distinct nicotinamide ring configurations, not overall molecular shapes, explain the observed fluorescence dynamics.

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Area of Science:

  • Biophysics
  • Photochemistry
  • Biochemistry

Background:

  • Biological systems often display complex fluorescence decay due to multiple species or environments.
  • Two-photon absorption (2PA) is a valuable technique for probing biological samples.
  • Understanding molecular dynamics and structural heterogeneity is crucial in biological research.

Purpose of the Study:

  • To develop a method for separately determining two-photon transition tensors in heterogeneous populations.
  • To identify structural differences between the two fluorescent states of the redox cofactor NAD(P)H.
  • To elucidate the molecular basis of fluorescence heterogeneity in NAD(P)H.

Main Methods:

  • Combined polarized 2PA with time-resolved fluorescence intensity and anisotropy decay measurements.
  • Utilized spectral analysis to resolve contributions from different molecular states.
  • Applied theoretical analysis to interpret transition tensor properties.

Main Results:

  • Successfully resolved the two-photon transition tensors for distinct components within a heterogeneous NAD(P)H population.
  • Identified significant structural differences between the two fluorescent states of NAD(P)H.
  • Demonstrated that these differences arise from alternate configurations of the nicotinamide ring.

Conclusions:

  • The study provides a powerful approach to analyze heterogeneous photophysical processes in biological molecules.
  • The findings support a model where NAD(P)H fluorescence heterogeneity is attributed to nicotinamide ring conformations.
  • This work advances the understanding of cofactor dynamics and their implications in biological functions.