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Published on: January 20, 2016
Amino and hydroxy substitution influences pyrene-DNA binding
Chao Qin1, Xiaojie Hu1, Michael Gatheru Waigi1
1Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Amino (-NH2) substitution greatly enhanced polycyclic aromatic hydrocarbon (PAH)-DNA binding, while hydroxy (-OH) substitution inhibited it. This clarifies how functional groups affect PAH interactions with DNA, crucial for understanding carcinogenesis.
Area of Science:
- Environmental Chemistry
- Molecular Toxicology
- Biochemistry
Background:
- Polycyclic aromatic hydrocarbon (PAH)-DNA binding is a critical event in PAH-induced carcinogenesis.
- The influence of functional groups on PAH-DNA binding remains largely unexplored.
Purpose of the Study:
- To investigate the impact of amino (-NH2) and hydroxy (-OH) substitutions on pyrene-DNA binding.
- To elucidate the mechanisms underlying functional group-mediated alterations in PAH-DNA interactions.
Main Methods:
- Spectroscopic techniques were employed to study pyrene and its derivatives binding to DNA.
- Quantum chemical calculations were utilized to analyze structural and electronic properties.
- Binding constants (log KA) and quenching constants (KSV) were determined.
Main Results:
- -NH2 substitution significantly increased the binding constant (log KA) from 4.14 to 12.31 L mol−1, facilitating binding.
- -OH substitution decreased the binding constant (log KA) to 3.68 L mol−1, inhibiting binding.
- Spectroscopy indicated pyrene derivatives bind with thymine, causing DNA damage or distortion; -NH2 substitution promotes hydrogen bond formation enhancing binding.
Conclusions:
- Functional groups, particularly -NH2 via hydrogen bonding, play a significant role in modulating PAH-DNA binding affinity.
- Electrostatic surface potential (ESP) is a key factor influencing binding facilitation or inhibition.
- Understanding these structure-activity relationships is vital for assessing the carcinogenic potential of substituted PAHs.
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