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Conformational changes in human fibrinogen after in vitro phosphorylation and their relation to fibrinogen behaviour
Author(s) -
Martin Steven C.,
Björk Ingemar
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)80458-u
Subject(s) - chemistry , phosphorylation , circular dichroism , casein kinase 1 , biochemistry , casein , casein kinase 2 , kinase , phosphatase , protein kinase a , protein phosphorylation , microbiology and biotechnology , cyclin dependent kinase 2 , biology
The far‐ultraviolet circular dichroism spectra of fibrinogens phosphorylated by protein kinase C or casein kinase II indicated a conformational change corresponding to an increase in ordered secondary structure. The spectra of protein kinase A‐ or casein kinase I‐phosphorylated fibrinogens did not differ substantially from the control. Fluorescence studies indicated changes in the tertiary structure around tryptophan residues for protein kinase A‐ or C‐phosphorylated fibrinogens, but failed to show any such change for fibrinogen phosphorylated by either of the casein kinases. This latter result was also confirmed by circular dichroism measurements in the near‐ultraviolet region. The apparent increase in ordered structure was proposed as an explanation for the slower rate of plasmin degradation seen in fibrinogens after phosphorylation by protein kinase C [6], and casein kinase II, especially as both spectral changes and plasmin degradation rate were unaffected by alkaline phosphatase.