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Stabilization and Multiple-Responsive Recognition of Natural base pairs in Water by a Cationic Cage

CCS Chemistry 2022年第9期4卷 2914-2920页

作者： Lin Cheng Ping Tian Qingfang Li Anyang Li Liping Cao College of Chemistry and Materials Science Northwest UniversityXi’an 710069

The hydrogen-bonded(H-bonded)base pairs,double H-bonded A•T and triple H-bonded G•C in DNA,are important units for storing,encoding,and expressing genetic information.Owing to the interference from water,however,the formation of H-bonded base pairs from short deoxynucleotide fragments such as mono-or di-deoxynucleotide are not easily achieved in aqueous solutions.

关键词： host–guest chemistry chiral recognition adaptive chirality tetraphenylethene-based cationic cage base pair

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Raman Spectroscopic Analysis of the Effect of Ultraviolet Irradiation on Calf Thymus DNA

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Acta Biochimica et Biophysica Sinica 2005年第1期37卷 39-46页

作者： Yu-Long TANG Zhou-Yi GUO~* Institute of Laser and Life Science.South China Normal University,Guangzhou 510631,China Institute of Laser and Life Science South China Normal UniversityGuangzhou 510631 China

Raman spectroscopy was used for the first time to detect the effect of independent UVA(ultraviolet-A:320-400 nm)and UVB(ultraviolet-B:280-320 nm)irradiation on the calf thymus DNA inaqueous solution.After both UVA and UVB irradiation for 1 h or 3 h,the damage to the conformation of DNAwas rnoderate,but the reduction of the B-form DNA component was obvious.Both UVA and UVB causedsignificant damage to the deoxyribose moiety and bases,among which the pyrimidine base pairs were moreseriously affected.There appeared to be preferential damaging sites on DNA molecules caused by UVA andUVB irradiation,UVA irradiation caused more damage to the deoxyribose than UVB irradiation,while UVBirradiation caused more significant damage to the pyrimidine moiety than UVA irradiation.After UVB irradia-tion for 3 h,unstacking of the AT base pairs and the cytosine ring took place,severe damage to the thyminemoiety occurred,and some base pairs were modified.Moreover,with either UVA or UVB irradiation for 3 h,the photoreactivation of DNA occurred.The damage to the DNA caused by UVB was immediate,while thedamage caused by UVA was proportional to the irradiation duration.The experimental results partly indicatethe formation of some cyclobutane pyrimidine dimers and(6-4)pbotoproducts.

关键词： Raman spectroscopy deoxyribonucleic acid(DNA) ultraviolet irradiation(UV) base pair

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