Abstract:
:Proteins lacking prosthetic groups and/or cofactors are known to undergo electronic excitation transitions only upon exposure to UV-C (< 280 nm) and UV-B (280-320 nm), but not UV-A (320-400 nm) photons. Here, we report the discovery of a novel excitation that peaks at approximately 340 nm and yields visible violet-blue radiation with apparent band maxima at approximately 425, 445, 470, and 500 nm. All proteins and large polypeptides examined in solid form, and in solutions, display this quenchable and photobleachable radiation which can be established not owing to aromatic sidechains. As a note of caution, we wish to state that we have not been able to completely eliminate the possibility that the radiation may be an artifact owing to second order effects such as, e.g., Raman scattering of Raman-scattered photons; however, we assert that all our experiments indicate that the radiation actually owes to some form of fluorescence. We propose that peptide electrons that have been delocalized through intramolecular or intermolecular hydrogen bond formation display these long-wavelength electronic transitions. If confirmed by future studies, this preliminary discovery may turn out to have important implications for biomolecular spectroscopy, protein crystallography, and materials science.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Shukla A,Mukherjee S,Sharma S,Agrawal V,Radha Kishan KV,Guptasarma Pdoi
10.1016/j.abb.2004.05.007subject
Has Abstractpub_date
2004-08-15 00:00:00pages
144-53issue
2eissn
0003-9861issn
1096-0384pii
S0003986104002693journal_volume
428pub_type
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