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Interaction of [V IV O(acac) 2 ] with Human Serum Transferrin and Albumin
Author(s) -
Correia Isabel,
Chorna Ielyzaveta,
Cavaco Isabel,
Roy Somnath,
Kuznetsov Maxim L.,
Ribeiro Nádia,
Justino Gonçalo,
Marques Fernanda,
SantosSilva Teresa,
Santos Marino F.A.,
Santos Hugo M.,
Capelo José L.,
Doutch James,
Pessoa João Costa
Publication year - 2017
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201700469
Subject(s) - transferrin , chemistry , circular dichroism , human serum albumin , vanadium , serum albumin , size exclusion chromatography , blood proteins , albumin , mass spectrometry , crystallography , nuclear chemistry , chromatography , inorganic chemistry , biochemistry , enzyme
[VO(acac) 2 ] is a remarkable vanadium compound and has potential as a therapeutic drug. It is important to clarify how it is transported in blood, but the reports addressing its binding to serum proteins have been contradictory. We use several spectroscopic and mass spectrometric techniques (ESI and MALDI‐TOF), small‐angle X‐ray scattering and size exclusion chromatography (SEC) to characterize solutions containing [VO(acac) 2 ] and either human serum apotransferrin (apoHTF) or albumin (HSA). DFT and modeling protein calculations are carried out to disclose the type of binding to apoHTF. The measured circular dichroism spectra, SEC and MALDI‐TOF data clearly prove that at least two VO–acac moieties may bind to apoHTF, most probably forming [V IV O(acac)(apoHTF)] complexes with residues of the HTF binding sites. No indication of binding of [VO(acac) 2 ] to HSA is obtained. We conclude that V IV O–acac species may be transported in blood by transferrin. At very low complex concentrations speciation calculations suggest that [(VO)(apoHTF)] species form.