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Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin

[Image: see text] The binding modes of o-, m-, and p-trans-BMPyP with DNA were studied using their spectroscopic properties. Also, the binding modes were compared based on the location and number of periphery cationic methylpyridine ions of the cationic porphyrins. The optical absorption spectra of...

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Autores principales: Kwak, Min Ik, Jeon, Bo Ram, Kim, Seog K., Jang, Yoon Jung
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2018
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641333/
https://www.ncbi.nlm.nih.gov/pubmed/31457940
http://dx.doi.org/10.1021/acsomega.7b01627
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author Kwak, Min Ik
Jeon, Bo Ram
Kim, Seog K.
Jang, Yoon Jung
author_facet Kwak, Min Ik
Jeon, Bo Ram
Kim, Seog K.
Jang, Yoon Jung
author_sort Kwak, Min Ik
collection PubMed
description [Image: see text] The binding modes of o-, m-, and p-trans-BMPyP with DNA were studied using their spectroscopic properties. Also, the binding modes were compared based on the location and number of periphery cationic methylpyridine ions of the cationic porphyrins. The optical absorption spectra of the o-, m-, and p-trans-BMPyP when bound to DNA presented red shifts and hypochromicity compared to the optical absorption spectrum of DNA-free cationic porphyrins. m-trans-BMPyP–DNA presented the largest red shifts and hypochromicity. The results of the circular dichroism spectral analysis indicated positive and negative bisignate absorption bands in the Soret band of the porphyrins in the case of all concentration ratios of o- and p-trans-BMPyP–DNA, and two negative absorption bands were observed in m-trans-BMPyP–DNA. Compared to the size of the absorption band of the DNA optical absorption spectrum, the results of the reduced linear (LD(r)) spectral analysis indicated mainly small sizes of Soret absorption bands (the absorption spectrum of porphyrins) and positive LD(r) values for o- and p-trans-BMPyP–DNA. In consideration of several of such spectroscopic properties, the binding of o- and p-trans-BMPyP with DNA can be said to be distant to insertion modes. Although the case of m-trans-BMPyP to DNA is an insertion mode, the m-trans-BMPyP molecular surface presented much tilt within the intercalation pocket. The results of comparing the binding modes of TMPyP having four periphery cationic methylpyridine ions of cationic porphyrin indicated that regardless of the number of periphery cationic methylpyridine ions of cationic porphyrin, in the case of the ortho-position, nonplanarity due to steric hindrance of the periphery cationic methylpyridine ions presented outside or groove-binding modes indicative of interaction with DNA phosphates. Unlike the ortho-position, the para-position presented different binding modes based on the number of periphery cationic methylpyridine ions. Only cationic porphyrins having four periphery cationic methylpyridine ions were inserted into the DNA. Lastly, regardless of the number of periphery cationic methylpyridine ions, all meta-positions were inserted into the DNA. This indicated that at the least the location and the number of periphery cationic methylpyridine ions of the porphyrins used in this experiment were important elements that determine insertion into DNA base pairs.
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spelling pubmed-66413332019-08-27 Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin Kwak, Min Ik Jeon, Bo Ram Kim, Seog K. Jang, Yoon Jung ACS Omega [Image: see text] The binding modes of o-, m-, and p-trans-BMPyP with DNA were studied using their spectroscopic properties. Also, the binding modes were compared based on the location and number of periphery cationic methylpyridine ions of the cationic porphyrins. The optical absorption spectra of the o-, m-, and p-trans-BMPyP when bound to DNA presented red shifts and hypochromicity compared to the optical absorption spectrum of DNA-free cationic porphyrins. m-trans-BMPyP–DNA presented the largest red shifts and hypochromicity. The results of the circular dichroism spectral analysis indicated positive and negative bisignate absorption bands in the Soret band of the porphyrins in the case of all concentration ratios of o- and p-trans-BMPyP–DNA, and two negative absorption bands were observed in m-trans-BMPyP–DNA. Compared to the size of the absorption band of the DNA optical absorption spectrum, the results of the reduced linear (LD(r)) spectral analysis indicated mainly small sizes of Soret absorption bands (the absorption spectrum of porphyrins) and positive LD(r) values for o- and p-trans-BMPyP–DNA. In consideration of several of such spectroscopic properties, the binding of o- and p-trans-BMPyP with DNA can be said to be distant to insertion modes. Although the case of m-trans-BMPyP to DNA is an insertion mode, the m-trans-BMPyP molecular surface presented much tilt within the intercalation pocket. The results of comparing the binding modes of TMPyP having four periphery cationic methylpyridine ions of cationic porphyrin indicated that regardless of the number of periphery cationic methylpyridine ions of cationic porphyrin, in the case of the ortho-position, nonplanarity due to steric hindrance of the periphery cationic methylpyridine ions presented outside or groove-binding modes indicative of interaction with DNA phosphates. Unlike the ortho-position, the para-position presented different binding modes based on the number of periphery cationic methylpyridine ions. Only cationic porphyrins having four periphery cationic methylpyridine ions were inserted into the DNA. Lastly, regardless of the number of periphery cationic methylpyridine ions, all meta-positions were inserted into the DNA. This indicated that at the least the location and the number of periphery cationic methylpyridine ions of the porphyrins used in this experiment were important elements that determine insertion into DNA base pairs. American Chemical Society 2018-01-25 /pmc/articles/PMC6641333/ /pubmed/31457940 http://dx.doi.org/10.1021/acsomega.7b01627 Text en Copyright © 2018 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Kwak, Min Ik
Jeon, Bo Ram
Kim, Seog K.
Jang, Yoon Jung
Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title_full Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title_fullStr Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title_full_unstemmed Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title_short Binding Mode of Cationic Porphyrin with CT-DNA: Importance of the Location and the Number of Positively Charged of Periphery Cationic Ions of Porphyrin
title_sort binding mode of cationic porphyrin with ct-dna: importance of the location and the number of positively charged of periphery cationic ions of porphyrin
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6641333/
https://www.ncbi.nlm.nih.gov/pubmed/31457940
http://dx.doi.org/10.1021/acsomega.7b01627
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