Fluorometric characterization of dityrosine: complex formation with boric acid and borate ion.

Abstract:

:Borate/boric acid solutions have distinctive effects on the absorption and fluorescence emission spectra of dityrosine. In the presence of excess borate/boric acid, the fluorescence emission maximum of the singly ionized dityrosine chromophore shifts from 407 nm (quantum yield = 0.80) to 374 nm (quantum yield = 0.14). Fluorescence measurements performed as a function of pH and concentration are consistent with a 1:1 complex which may dissociate to either boric acid and singly ionized dityrosine (K1 = 17 mM) or to monoborate ion and unionized dityrosine (K2 = 0.10 mM). As a consequence of the pKa values characteristic of dityrosine and boric acid, complex formation is maximal near pH 8. 2,2'-Dihydroxy-biphenyl shows similar interactions. The fluorescence of dityrosyl calmodulin (0 Ca2+) also responds to the addition of boric acid, giving K1 = 42 mM and K2 = 2 mM. Singly ionized dityrosine produced through dissociation occurring in the excited state does not interact with boric acid.

authors

Malencik DA,Anderson SR

doi

10.1016/0006-291x(91)91779-c

subject

Has Abstract

pub_date

1991-07-15 00:00:00

pages

60-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(91)91779-C

journal_volume

178

pub_type

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