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[[Image:1b0s.gif|left|200px]]
{{Seed}}
[[Image:1b0s.png|left|200px]]


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{{STRUCTURE_1b0s|  PDB=1b0s  |  SCENE=  }}  
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'''BINDING OF AR-1-144, A TRI-IMIDAZOLE DNA MINOR GROOVE BINDER, TO CCGG SEQUENCE ANALYZED BY NMR SPECTROSCOPY'''
===BINDING OF AR-1-144, A TRI-IMIDAZOLE DNA MINOR GROOVE BINDER, TO CCGG SEQUENCE ANALYZED BY NMR SPECTROSCOPY===




==Overview==
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The interactions of N-[2-(dimethylamino)ethyl]-1-methyl-4-[1-methyl-4-[4-formamido-1-meth ylimidazole-2-carboxamido]imidazole-2-carboxamido]imidazole-2-c arboxa mide (AR-1-144), a tri-imidazole polyamide minor groove binder, with DNA have been investigated by NMR and CD spectroscopy. A series of DNA oligonucleotides with a C/G-containing four-bp core, i.e. CCGG, CGCG, GGCC, and GCGC, have been titrated with AR-1-144 at different ratios. AR-1-144 favors the CCGG sequence. The flanking sequence of the CCGG core also influences the binding preference, with a C or T being favored on the 3'-side of the CCGG core. The three-dimensional structure of the symmetric 2:1 side-by-side complex of AR-1-144 and GAACCGGTTC, determined by NOE-constrained NMR refinement, reveals that each AR-1-144 binds to four base pairs, i.e. at C5-G6-G7-T8, with every amide-imidazole unit forming two potential hydrogen bonds with DNA. The same DNA binding preference of AR-1-144 was also confirmed by circular dichroism spectroscopy, indicating that the DNA binding preference of AR-1-144 is independent of concentration. The cooperative binding of an AR-1-144 homodimer to the (purine)CCGG(pyrimidine) core sequence appears to be weaker than that of the distamycin A homodimer to A/T sequences, most likely due to the diminished hydrophobic interactions between AR-1-144 and DNA. Our results are consistent with previous footprinting data and explain the binding pattern found in the crystal structure of a di-imidazole drug bound to CATGGCCATG.
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{{ABSTRACT_PUBMED_10469127}}


==About this Structure==
==About this Structure==
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B0S OCA].  
Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B0S OCA].  


==Reference==
==Reference==
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[[Category: Drug design]]
[[Category: Drug design]]
[[Category: Sequence specific recognition]]
[[Category: Sequence specific recognition]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 10:55:54 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 18:00:10 2008''

Revision as of 15:00, 30 June 2008

File:1b0s.png

Template:STRUCTURE 1b0s

BINDING OF AR-1-144, A TRI-IMIDAZOLE DNA MINOR GROOVE BINDER, TO CCGG SEQUENCE ANALYZED BY NMR SPECTROSCOPY

Template:ABSTRACT PUBMED 10469127

About this Structure

Full experimental information is available from OCA.

Reference

Binding of AR-1-144, a tri-imidazole DNA minor groove binder, to CCGG sequence analyzed by NMR spectroscopy., Yang XL, Kaenzig C, Lee M, Wang AH, Eur J Biochem. 1999 Aug;263(3):646-55. PMID:10469127

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