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FLUORESCENCE BEHAVIOUR OF SEQUENTIAL TYROSYL POLYPEPTIDES
Author(s) -
Pantar Arun V.,
Rao M. V. R.,
Atreyi M.,
Kumar Satish
Publication year - 1986
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1986.tb09538.x
Subject(s) - fluorescence , chemistry , comonomer , tyrosine , irradiation , photochemistry , stereochemistry , biochemistry , organic chemistry , polymer , monomer , quantum mechanics , physics , nuclear physics
— Fluorescence behaviour of three sequential tyrosyl copolypeptides, (Gly‐Tyr) 35 , (Ala‐Tyr) 29 and (Val‐Tyr) 22 , was studied in alkaline solutions, in which ionisation of tyrosyl hydroxyl was 80%. Irradiation at 280 nm in all the three systems lead to the formation of a photoproduct which fluoresced intensely at 410 nm. The facility of the photoreaction depended markedly on the nature of the comonomer of tyrosine and the conformation of the polypeptide chain. As a result of photoproduct formation, the polypeptide backbone is hindered in acquiring more ordered structure at a lower degree of tyrosyl ionisation.