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DNA-binding metallo-intercalators are positively charged, planar, polycyclic, aromatic compounds that unwind the DNA double helix and insert themselves between DNA base pairs.^[1] Metallo-intercalators insert themselves between two intact base pairs without expelling or replacing the original nitrogenous bases; the hydrogen bonds between the nitrogenous bases at the site of intercalation remain unbroken.^[1]^[2]^[3] In addition to π-stacking between the aromatic regions of the intercalator and the nitrogenous bases of DNA, intercalation is stabilized by van der Waals, hydrophobic, electrostatic, and entropic interactions.^[2] This ability to bind to specific DNA base pairs allows for potential therapeutic applications of metallo-intercalators.

Synthesis of metallo-intercalators

Figure 1: Chemical structure of the DNA-binding metallo-intercalator complex [Ru(bpy)2(paip)]2+ with intercalative and ancillary ligands labeled.^[4]^[5]

In the case of ruthenium intercalators, the general synthesis consists of preparing intercalative ligands followed by their coupling to a ruthenium metal complex coordinated by specific ancillary ligands.^[6]^[7] Examples of prior ruthenium complexes used as precursors for metallo-intercalators include cis-[Ru(bpy)₂Cl₂] and cis-[Ru(phen)₂Cl₂]∙2H₂O, which can be synthesized into [Ru(bpy)₂(maip)]²⁺, [Ru(bpy)₂(paip)]²⁺, [Ru(bpy)₂(bfipH)](ClO₄)₂, and Ru(phen)₂(bfipH)](ClO₄)₂.^[4]^[5]

Mechanism of DNA-intercalation

Metallo-intercalators π-stack with unbroken DNA base pairs after entering via a groove, typically the major, (in contrast to metallo-insertors, which replace expelled base pairs after entering double stranded DNA via the minor groove).^[9]^[10] Intercalation of a metallo-intercalator creates less strain in the DNA duplex than insertion; metallo-insertors induce an untwist of the double helix and an opening of the phosphate backbone while metallo-intercalators marginally increase the rise and width of the major groove.^[1]^[9] Intercalation of metal compounds between DNA base pairs effectively stabilizes the double helix, increasing the melting temperature of the DNA duplex.^[8] Binding of metallo-intercalators to DNA is reversible and depends on the properties of the intercalating molecule. Metallo-intercalators with different metal centers, oxidation states, coordination geometries, and overall sizes will exhibit varying “depths of insertion”.^[3] For example, square planar complexes penetrate deeper into the DNA base pairs than octahedral or tetrahedral complexes do.^[3] Also, positive charges on the metallo-intercalator strengthen DNA-binding because of electrostatic attraction to the negatively charged sugar-phosphate backbone.^[6]

Therapeutic applications

Metallo-intercalators have a variety of potential therapeutic applications as a result of their structural diversity and universal photooxidative properties. One possible therapeutic application of metallo-intercalators is to combat cancerous tumor cells within the body by targeting specific mismatched DNA base pairs; the ability to modify the ligands bound to the metal center allows for a high degree of specificity in the binding interactions between the metallo-intercalator and the DNA sequence.^[11]^[12]^[13] For example, the ligand 5,6-chrysenequinone diimine (chrysi) and its analogues are designed to be too wide to fit inside the normal span of the base pairs of B-DNA, causing it to bind instead to the wider portions of the helix at destabilized sites of mismatched bases.^[11]^[12] After intercalation, the sample can be photoactivated by absorbing energy during irradiation with short wavelength light.^[1] This activation causes the metallo-intercalator's photooxidative properties to induce a cleavage of the sugar phosphate backbone at the site of mismatch through a radical mechanism.^[1]^[11]^[12] Even in the absence of irradiation, the interactions between the metallo-intercalator and DNA can substantially decrease the proliferation of cells containing DNA with mismatched base pairs.^[13]

References

^ ^a ^b ^c ^d ^e Zeglis, Brian M.; Pierre, Valerie C.; Barton, Jacqueline K. (2007). "Metallo-intercalators and Metallo-insertors" (PDF). Chemical Communications. 44 (44): 4565–79. doi:10.1039/b710949k. PMC 2790054. PMID 17989802.
^ ^a ^b Gill, Martin R., and Jim A. Thomas. "Ruthenium(ii) Polypyridyl Complexes and DNA-from Structural Probes to Cellular Imaging and Therapeutics - (RSC Publishing)." Chem Soc Rev, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/en/Content/ArticlePDF/2012/CS/c2cs15299a>.
^ ^a ^b ^c Pages, Benjamin J., Dale L. Ang, Elise P. Wright, and Janice R. Aldrich-Wright. "Metal Complex Interactions with DNA." Royal Society of Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/en/content/articlehtml/2014/dt/c4dt02700k>.
^ ^a ^b Vargiu, Attilio V., and Alessandra Magistrato. "Detecting DNA Mismatches with Metallo-Insertors: A Molecular Simulation Study." Inorganic Chemistry. Inorganic Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.acs.org/doi/pdfplus/10.1021/ic201659v>.
^ ^a ^b Raman, Natarajan; Rajakumar, Ramasubbu (2014). "Bis-amide Transition Metal Complexes: Isomerism and DNA Interaction Study". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 120: 428–436. doi:10.1016/j.saa.2013.10.037. PMID 24211801.
^ ^a ^b Liu, Yun-Jun; Liang, Zhen-Hua; Li, Zheng-Zheng; Yao, Jun-Hua; Huang, Hong-Liang (2011). "Ruthenium(II) Polypyridyl Complexes: Synthesis and Studies of DNA Binding, Photocleavage, Cytotoxicity, Apoptosis, Cellular Uptake, and Antioxidant Activity". DNA and Cell Biology. 30 (2): 829–38. doi:10.1016/j.ejmech.2009.10.043. PMID 19932529.
^ Du, Ke-Jie, Jin-Quan Wang, Jun-Feng Kou, Guan-Ying Li, Li-Li Wang, Hui Chao, and Liang-
^ ^a ^b Kielkopf, C. L., K. E. Erkkila, B. P. Hudson, J. K. Barton, and D. C. Rees. "INTERCALATION AND MAJOR GROOVE RECOGNITION IN THE 1.2 A RESOLUTION CRYSTAL STRUCTURE OF RH[ME2TRIEN]PHI BOUND TO 5'-G(5IU)TGCAAC-3'" RCSB Protein Data Bank. N.p., n.d. Web. 26 Jan. 2015. <http://www.rcsb.org/pdb/explore/explore.do?structureId=454D>.
^ ^a ^b Lauria, Antonino, Riccardo Bonsignore, and Alessio Terenzi. "Nickel(ii), Copper(ii) and Zinc(ii) Metallo-intercalators: Structural Details of the DNA-binding by a Combined Experimental and Computational Investigation - (RSC Publishing)." Royal Society of Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/EN/content/articlehtml/2014/dt/c3dt53066c>.
^ Alessandro Biancardi, Azzurra Burgalassi, Alessio Terenzi, Angelo Spinello, Giampaolo Barone, Tarita Biver, and Benedetta Mennucci. |title="A Theoretical and Experimental Investigation of the Spectroscopic Properties of a DNA‐Intercalator Salphen‐Type ZnII Complex" |journal=Chemistry–A European Journal, |date=2015 |volume=20 |issue=24 |pages=7439-7447. |doi=10.1002/chem.201304876
^ ^a ^b ^c ^d Pierre, VC; Kaiser, JT; Barton, JK (2007). "Insights into finding a mismatch through the structure of a mispaired DNA bound by a rhodium intercalator". Proc. Natl. Acad. Sci. U.S.A. 104 (2): 429–34. Bibcode:2007PNAS..104..429P. doi:10.1073/pnas.0610170104. PMC 1766401. PMID 17194756.
^ ^a ^b ^c ^d Junicke, H.; Hart, J. R.; Kisko, J.; Glebov, O.; Kirsch, I. R.; Barton, J. K. (2003). "Bioinorganic Chemistry Special Feature: A Rhodium(III) Complex for High-affinity DNA Base-pair Mismatch Recognition". Proceedings of the National Academy of Sciences. 100 (7): 3737–42. Bibcode:2003PNAS..100.3737J. doi:10.1073/pnas.0537194100. PMC 152991. PMID 12610209.
^ ^a ^b Hart, J. R.; Glebov, O.; Ernst, R. J.; Kirsch, I. R.; Barton, J. K. (2006). "DNA Mismatch-specific Targeting and Hypersensitivity of Mismatch-repair-deficient Cells to Bulky Rhodium(III) Intercalators". Proceedings of the National Academy of Sciences. 103 (42): 15359–5363. Bibcode:2006PNAS..10315359H. doi:10.1073/pnas.0607576103. PMC 1622828. PMID 17030786.

[ref1-1] Zeglis, Brian M.; Pierre, Valerie C.; Barton, Jacqueline K. (2007). "Metallo-intercalators and Metallo-insertors" (PDF). Chemical Communications. 44 (44): 4565–79. doi:10.1039/b710949k. PMC 2790054. PMID 17989802.

[ref2-2] Gill, Martin R., and Jim A. Thomas. "Ruthenium(ii) Polypyridyl Complexes and DNA-from Structural Probes to Cellular Imaging and Therapeutics - (RSC Publishing)." Chem Soc Rev, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/en/Content/ArticlePDF/2012/CS/c2cs15299a>.

[ref3-3] Pages, Benjamin J., Dale L. Ang, Elise P. Wright, and Janice R. Aldrich-Wright. "Metal Complex Interactions with DNA." Royal Society of Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/en/content/articlehtml/2014/dt/c4dt02700k>.

[ref6-4] Vargiu, Attilio V., and Alessandra Magistrato. "Detecting DNA Mismatches with Metallo-Insertors: A Molecular Simulation Study." Inorganic Chemistry. Inorganic Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.acs.org/doi/pdfplus/10.1021/ic201659v>.

[ref7-5] Raman, Natarajan; Rajakumar, Ramasubbu (2014). "Bis-amide Transition Metal Complexes: Isomerism and DNA Interaction Study". Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 120: 428–436. doi:10.1016/j.saa.2013.10.037. PMID 24211801.

[ref4-6] Liu, Yun-Jun; Liang, Zhen-Hua; Li, Zheng-Zheng; Yao, Jun-Hua; Huang, Hong-Liang (2011). "Ruthenium(II) Polypyridyl Complexes: Synthesis and Studies of DNA Binding, Photocleavage, Cytotoxicity, Apoptosis, Cellular Uptake, and Antioxidant Activity". DNA and Cell Biology. 30 (2): 829–38. doi:10.1016/j.ejmech.2009.10.043. PMID 19932529.

[7] Du, Ke-Jie, Jin-Quan Wang, Jun-Feng Kou, Guan-Ying Li, Li-Li Wang, Hui Chao, and Liang-

[ref9-8] Kielkopf, C. L., K. E. Erkkila, B. P. Hudson, J. K. Barton, and D. C. Rees. "INTERCALATION AND MAJOR GROOVE RECOGNITION IN THE 1.2 A RESOLUTION CRYSTAL STRUCTURE OF RH[ME2TRIEN]PHI BOUND TO 5'-G(5IU)TGCAAC-3'" RCSB Protein Data Bank. N.p., n.d. Web. 26 Jan. 2015. <http://www.rcsb.org/pdb/explore/explore.do?structureId=454D>.

[ref8-9] Lauria, Antonino, Riccardo Bonsignore, and Alessio Terenzi. "Nickel(ii), Copper(ii) and Zinc(ii) Metallo-intercalators: Structural Details of the DNA-binding by a Combined Experimental and Computational Investigation - (RSC Publishing)." Royal Society of Chemistry, n.d. Web. 26 Jan. 2015. <http://pubs.rsc.org/EN/content/articlehtml/2014/dt/c3dt53066c>.

[10] Alessandro Biancardi, Azzurra Burgalassi, Alessio Terenzi, Angelo Spinello, Giampaolo Barone, Tarita Biver, and Benedetta Mennucci. |title="A Theoretical and Experimental Investigation of the Spectroscopic Properties of a DNA‐Intercalator Salphen‐Type ZnII Complex" |journal=Chemistry–A European Journal, |date=2015 |volume=20 |issue=24 |pages=7439-7447. |doi=10.1002/chem.201304876

[ref10-11] Pierre, VC; Kaiser, JT; Barton, JK (2007). "Insights into finding a mismatch through the structure of a mispaired DNA bound by a rhodium intercalator". Proc. Natl. Acad. Sci. U.S.A. 104 (2): 429–34. Bibcode:2007PNAS..104..429P. doi:10.1073/pnas.0610170104. PMC 1766401. PMID 17194756.

[ref11-12] Junicke, H.; Hart, J. R.; Kisko, J.; Glebov, O.; Kirsch, I. R.; Barton, J. K. (2003). "Bioinorganic Chemistry Special Feature: A Rhodium(III) Complex for High-affinity DNA Base-pair Mismatch Recognition". Proceedings of the National Academy of Sciences. 100 (7): 3737–42. Bibcode:2003PNAS..100.3737J. doi:10.1073/pnas.0537194100. PMC 152991. PMID 12610209.

[ref12-13] Hart, J. R.; Glebov, O.; Ernst, R. J.; Kirsch, I. R.; Barton, J. K. (2006). "DNA Mismatch-specific Targeting and Hypersensitivity of Mismatch-repair-deficient Cells to Bulky Rhodium(III) Intercalators". Proceedings of the National Academy of Sciences. 103 (42): 15359–5363. Bibcode:2006PNAS..10315359H. doi:10.1073/pnas.0607576103. PMC 1622828. PMID 17030786.

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PROFILPELAJAR.COM

DNA-binding metallo-intercalators

Synthesis of metallo-intercalators

Mechanism of DNA-intercalation

Therapeutic applications

References

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