175d: Difference between revisions

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[[Image:175d.jpg|left|200px]]
{{Seed}}
[[Image:175d.png|left|200px]]


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{{STRUCTURE_175d|  PDB=175d  |  SCENE=  }}  
{{STRUCTURE_175d|  PDB=175d  |  SCENE=  }}  


'''THE DNA SEQUENCE GCGAATGAGC CONTAINING THE HUMAN CENTROMERE CORE SEQUENCE GAAT FORMS A SELF-COMPLEMENTARY DUPLEX WITH SHEARED G:A PAIRS IN SOLUTION'''
===THE DNA SEQUENCE GCGAATGAGC CONTAINING THE HUMAN CENTROMERE CORE SEQUENCE GAAT FORMS A SELF-COMPLEMENTARY DUPLEX WITH SHEARED G:A PAIRS IN SOLUTION===




==Overview==
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The DNA sequence dGCGAATGAGC has a well-resolved, two-dimensional nuclear Overhauser (NOESY) spectrum that is suitable for high quality solution structure determination by NMR methods; in solution this sequence forms a stable self-complementary duplex containing sheared G.A base-pairs. A total of 220 distance constraints derived from time-dependent NOE measurements were collected and refined by repeated back-calculation of the NOESY spectra. Distance information from imino proton studies and from exclusive two-dimensional correlated spectroscopy (E. COSY) and/or linewidth analysis was included in the structure calculation using the program DSPACE 4.2, followed by restrained energy minimization with the program DISCOVER using the AMBER force field. The energies of the distance geometry (DG) structures decreased rapidly in the first few cycles and approached -510 +/- 3 kcal after 1000 cycles of conjugate gradient minimization (about 540 kcal lower than in the initial DG structures). All 15 final DG structures converged to a single family of closely related structures with pair-wise r.m.s.d. values of 0.96 +/- 0.34 A, which was further reduced by energy minimization to 0.70 +/- 0.35 A. Rather unusual structural features of the duplex are revealed in the final structures. The results indicate that, in addition to normal sequences with standard base-pairing, unusual nucleic acid structures can also be determined in solution with quite high precision by NMR/distance geometry methods.
The line below this paragraph, {{ABSTRACT_PUBMED_8064859}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 8064859 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8064859}}


==About this Structure==
==About this Structure==
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=175D OCA].  
Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=175D OCA].  


==Reference==
==Reference==
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[[Category: Nmr]]
[[Category: Nmr]]
[[Category: Sheared g:a pair]]
[[Category: Sheared g:a pair]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 09:33:17 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:35:55 2008''

Revision as of 12:35, 30 June 2008

File:175d.png

Template:STRUCTURE 175d

THE DNA SEQUENCE GCGAATGAGC CONTAINING THE HUMAN CENTROMERE CORE SEQUENCE GAAT FORMS A SELF-COMPLEMENTARY DUPLEX WITH SHEARED G:A PAIRS IN SOLUTION

Template:ABSTRACT PUBMED 8064859

About this Structure

Full experimental information is available from OCA.

Reference

DNA sequence GCGAATGAGC containing the human centromere core sequence GAAT forms a self-complementary duplex with sheared G.A pairs in solution., Chou SH, Cheng JW, Fedoroff O, Reid BR, J Mol Biol. 1994 Aug 19;241(3):467-79. PMID:8064859

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