organometallic chemistry
Post on 12-Jul-2015
897 Views
Preview:
TRANSCRIPT
Intercalation induces structural distortions
Metal Complexes as DNA
Intercalators
HONG-KE LIU &PETER J. SADLER
Fatemeh Babaei
Ethidium intercalated between
two adenine-thymine base pairs
These molecules cause structural modifications that can lead to functional changes, often
to inhibition of transcription and replication and DNA repair processes, which make
intercalators potent mutagens.
Two major modes of inercalation
Classical intercalation Threading intercalation
Inserted between GpG base pair
That form the top and the bottom of
intercalation site
Occupy and interact with both major
and minor grooves of DNA
benzo[α]pyrene
acridine-4-carboxamides
Intercalation by Inert Square-Planar and Octahedral Metal Complexes
Square-planar complexes containing
aromatic fragments can bind to DNA
by intercalation without direct metal
coordination to DNA bases.
Octahedral metallointercalators
permit the targeting of specific DNA
sites by matching the
shape, symmetry, and functionalities of
the metal complex to that of the DNA
target.
Interaction of Metallointercalators with DNA
Metallo intercalationMetallo insertion
When do the Dual function happen?
When the aromatic side arms or arene
ligands can intercalate between DNA
bases while the metal coordinates
directly to a DNA base.
Intercalation by Dual-Function Metal Complexes with σ-Bonded Side Arm Intercalators
N7
Increasing the cytotoxicity by
adding pyridine and quinoline
Using as an anticancer drug
pyridine and quinoline have
intercalation with DNA duplex
Dihydroanthracene(dha)P-cymene(cym)
Benzen (ben)
Intercalation by Organometallic Ru -Arene Complexes
Dihydroanthracene(dha)P-cymene(cym)
Benzen (ben)
Arene Rate of reaction( 10-2 M-1 S-1)
Tetrahydroantheracene 14.72
biphenyl 8.06
Dihydroanthracene 7.08
P-Cymene 2.49
Benzen 1.13
Rate of reaction of (η6-arene)Ru- (en)(H2O]2+
with cGMP
Arene IC50 (μM)
Tetrahydroantheracene 0.5
Dihydroanthracene 2
Biphenyl 5
P-Cymene 10
Benzen 17
Cytotoxic activity
Cytotoxic activity, conformational distortions, recognation by DNA-binding proteins, and repair
mechanisms are depend on the Arene.
Adducts of Ru-Arene Complexes with Nucleobases and DNA
Large low-field shifts for protons on rings B and C of Ru-tha are observed for the monoruthenated DNA adduct.
Eram Garden (Shiraz)
Thanks for your attention
Qazvin
Tehran
Tehran
Shiraz
Esfahan
Shiraz
top related