Biopolymers and Cell. 2011; 27(6): 465-471

 

INTERACTION OF SERUM ALBUMINS WITH CLUSTER RHENIUM COMPOUNDS OF CISAND TRANS-CONFIGURATION

 

Leus I. V., 1Klenina I. O., 1Zablotska K. A., 2Golichenko O. A., 2Shtemenko O. V., Shtemenko N. I.


Dnipropetrovsk National University named by Oles Gonchar
72, Gagarin Av., Dnipropetrovs’k, Ukraine, 49050

1Institute of Gastroenterology AMSU
96, Newspaper «Pravda» Av., Dnipropetrovs’k, Ukraine, 49074

2Ukrainian State University of Chemical Technology
8, Gagarin Av., Dnipropetrovs’k, Ukraine, 49005

Aim. To investigate differences in the interactions of binuclear cluster rhenium(III) compounds of cis(I)and trans(II)-configuration with bovine serum albumin (BSA) and human serum albumin (HSA). Methods. Electronic spectroscopy, tryptophan fluorescence and circular dichroism spectroscopy. Results. It was shown that in the process of interaction of I and II with proteins different complexes were formed where the quadruple bond Re–Re remained. Conclusions. It is proposed that the trans-isomer interacts with molecular environment of Trp-214 (HSA) and Trp-212 (BSA) in hydrophobic pocket of the IIA subdomain of homological proteins. For the cis-isomer more complex mechanism operates that includes not only the subdomain IIA, but also at least one more binding site for the rhenium compound in the subdomain IB of the proteins. Different influence of I and II on the secondary structure of homological proteins has been shown.

 


Keywords: serum proteins, cluster rhenium compounds, fluorescent spectra, electronic absorbtion spectra, secondary structure

 

  Summary in Russsian