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Temperature dependence of collagen fluorescence
1Department of Medicine, Morehouse School of Medicine, 720 Westview Dr. S.W., Atlanta, GA 30310-1495, USA. menterj@msm.edu
Summary
This study investigated how temperature affects the fluorescence of collagen, finding that collagen structure influences this temperature dependence. These findings suggest fluorescence activation data could probe collagen
Area of Science:
- Biophysics
- Materials Science
- Biochemistry
Background:
- Dermal collagens possess intrinsic fluorescent moieties, such as tyrosine, dityrosine, and glycation adducts, which can potentially serve as molecular probes.
- Understanding the temperature-dependence of these fluorophores is crucial for their application in probing collagen structure and conformation.
- Collagen's complex structure, including its helical and denatured forms, may influence the photophysical properties of its intrinsic fluorophores.
Purpose of the Study:
- To investigate the temperature-dependence of fluorescence from various moieties within calf skin collagen and Skh-1 hairless mouse collagen.
- To determine the activation energy associated with radiationless fluorescence deactivation processes in collagen.
- To explore the potential of using fluorescence activation data as a probe for collagen's supramolecular structure and conformational changes.
Main Methods:
- Studied temperature-dependence (9-60°C) of fluorescence intensity for tyrosine, aggregated species, dityrosine, and glycation adducts in collagen samples.
- Utilized L-tyrosine in dilute solution as a reference compound to validate methods.
- Employed an Arrhenius-like plot of reciprocal normalized fluorescence intensity versus reciprocal temperature to determine an activation parameter (ΔE*).
Main Results:
- Fluorescence efficiency generally decreased with increasing temperature for all studied moieties in both collagen types.
- Activation parameters (ΔE*) for mouse and calf skin collagen below 20°C were 6.2-8.4 kJ/mol and 10.3-11.4 kJ/mol, respectively.
- Above 20°C, fluorescence deactivation pathways differed between mouse (concave-downward plots) and calf skin collagen (concave-upward plots), indicating structural influences.
Conclusions:
- Collagen's backbone and supramolecular structure significantly influence the temperature-dependent behavior of its intrinsic fluorescent probes.
- The observed differences in temperature-dependence above the helical-to-coil transition suggest distinct deactivation mechanisms in different collagen states.
- Fluorescence activation data holds promise as a sensitive method for assessing collagen's supramolecular structure and conformational integrity.
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