Protein binding studies of luminescent rhenium(I) diimine complexes

Phosphorescent rhenium-dipyrrinates: efficient photosensitizers for singlet oxygen generation

A series of rhenium(i) dipyrrinato complexes (Re1–Re8) have been prepared and characterized; their crystal structures, phosphorescence and singlet oxygen generation studies are reported.

Association studies to transporting proteins of fac-ReI(CO)3(pterin)(H2O) complex

A new synthetic route to acquire the water soluble complex fac-Re^I(CO)₃(pterin)(H₂O) was carried out in aqueous solution. The complex has been obtained with success via the fac-[Re^I(CO)₃(H₂O)₃]Cl precursor complex. Re^I(CO)₃(pterin)(H₂O) has been found to bind strongly with bovine and human serum albumins (BSA and HSA) with intrinsic-binding constants, K_b, of 6.5 × 10⁵ M^-1 and 5.6 × 10⁵ M^-1 at 310 K, respectively. The interactions of serum albumins with Re^I(CO)₃(pterin)(H₂O) were evaluated employing UV-vis fluorescence and absorption spectroscopy and circular dichroism. The results suggest that the serum albumins-Re^I(CO)₃(pterin)(H₂O) interactions occurred in the domain IIA-binding pocket without loss of helical stability of the proteins. The comparison of the fluorescence quenching of BSA and HSA due to the binding to the Re(I) complex suggested that local interaction around the Trp 214 residue had taken place. The analysis of the thermodynamic parameters ΔG⁰, ΔH⁰, and ΔS⁰ indicated that the hydrophobic interactions played a major role in both HSA-Re(I) and BSA-Re(I) association processes. All these experimental results suggest that these proteins can be considered as good carriers for transportation of Re^I(CO)₃(pterin)(H₂O) complex. This is of significant importance in relation to the use of this Re(I) complex in several biomedical fields, such as photodynamic therapy and radiopharmacy.

Sensing of tryptophan by a non-toxic cobalt(ii) complex

The first report of a cobalt(ii) based non-toxic, hemocompatible, fluorescent probe that sense Trp and BSA by reducing internal fluorescence quenching of Trp in aqueous solution.

A Spectroscopy Approach for the Study of the Interaction of Oxovanadium(IV)-Salen Complexes with Proteins

Oxovanadium(IV)-salen complexes bind with bovine serum albumin (BSA) and ovalbumin (OVA) strongly with binding constant in the range 10(4)-10(7) M(-1) at physiological pH (7.4) confirmed using UV-visible absorption, fluorescence spectral and circular dichroism (CD) study. CD results show that the binding of oxovanadium(IV) complexes induces the conformational change with the loss of α-helicity in the proteins. Docking studies indicate that mode of binding of oxovanadium(IV)-salen complexes with proteins is hydrophobic in nature.

Synthesis and characterization of monometallic rhenium(i) complexes and their application as selective sensors for copper(ii) ions

Monometallic Re(i) complexes, selective and sensitive sensor of Cu(ii) ion, show substantial enhancement in the emission intensity, quantum yield, and lifetime due to the restriction of CN isomerization.

A selective, long-lived deep-red emissive ruthenium(II) polypyridine complexes for the detection of BSA

A selective, label free luminescence sensor for bovine serum albumin (BSA) is investigated using ruthenium(II) complexes over the other proteins. Interaction between BSA and ruthenium(II) complexes has been studied using absorption, emission, excited state lifetime and circular dichroism (CD) spectral techniques. The luminescence intensity of ruthenium(II) complexes (I and II), has enhanced at 602 and 613 nm with a large hypsochromic shift of 18 and 5 nm respectively upon addition of BSA. The mode of binding of ruthenium(II) complexes with BSA has analyzed using computational docking studies.

Interaction of oxovanadium(iv)–salphen complexes with bovine serum albumin and their cytotoxicity against cancer

An oxovanadium(iv)–salphen complex acts as a probe for bovine serum albumin and shows cytotoxicity against cancer cells.