title: Fluorescence studies on clupein protamines: evidence for globular conformation.
abstract: Conjugates of fluorescein isothiocyanate with clupein YI, YII and Z, the protamines from Clupea palasii, were prepared and their fluorescence utilized to determine the rotational relaxation times of the proteins. All conjugates exhibited single component lifetimes near 4.05 ns. Linear isothermal Perrin plots were obtained for all conjugates; these data indicated rotational relaxation times of 3.33 ns for clupein YI and YII and 3.19 ns for clupein Z. These results and the results from our previous studies lead us to postulate globular conformations for the three proteins with hydrated molecular diameters of 22 A. Based on these findings a three dimensional model for Clupein YII is proposed.
mesh_terms: D003026:Clupeine; D016650:Fluorescein-5-isothiocyanate; D005452:Fluoresceins; D005456:Fluorescent Dyes; D011479:Protamines; D011487:Protein Conformation; D013050:Spectrometry, Fluorescence; D013861:Thiocyanates
chemical_list: D005452:Fluoresceins; D005456:Fluorescent Dyes; D011479:Protamines; D013861:Thiocyanates; D003026:Clupeine; D016650:Fluorescein-5-isothiocyanate