This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.


1ybl

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
-
[[Image:1ybl.gif|left|200px]]
+
{{Seed}}
 +
[[Image:1ybl.png|left|200px]]
<!--
<!--
Line 9: Line 10:
{{STRUCTURE_1ybl| PDB=1ybl | SCENE= }}
{{STRUCTURE_1ybl| PDB=1ybl | SCENE= }}
-
'''NMR structure of the i-motif tetramer of d(AACCCC)'''
+
===NMR structure of the i-motif tetramer of d(AACCCC)===
-
==Overview==
+
<!--
-
Using NMR methods, we have resolved the i-motif structures formed by d(AACCCC) and by d(CCCCAA), two versions of the DNA sequence repeated in the telomeric regions of the C-rich strand of tetrahymena chromosomes. Both oligonucleotides form fully symmetrical i-motif tetramers built by intercalation of two hemiprotonated duplexes containing four C*C+ pairs. The structures are extremely stable. In the tetramer of d(AACCCC), the outermost C*C+ pairs are formed by the cytidines of the 5' ends of the cytidine tracts. A2 forms an A2*A2 (H6trans-N7) pair stacked to C3*C3+ and cross-strand stacked to A1. At 0 degrees C, the lifetimes of the hemiprotonated pairs range from 1 ms for the outermost pair to approximately 1 h for the innermost pairs. The tetramer of d(CCCCAA) adopts two distinct intercalation topologies in slow conformational exchange. One, whose outermost C*C+ pairs are built by the cytidines of the 5' end and the other by those of the 3' end. In both topologies, the adenosine bases are fairly well stacked to the adjacent C*C+ pairs. They are not paired but form symmetrical pseudo-pairs with their H6cis amino proton and N1 nitrogen pointing towards each other.
+
The line below this paragraph, {{ABSTRACT_PUBMED_15647504}}, adds the Publication Abstract to the page
 +
(as it appears on PubMed at http://www.pubmed.gov), where 15647504 is the PubMed ID number.
 +
-->
 +
{{ABSTRACT_PUBMED_15647504}}
==About this Structure==
==About this Structure==
-
Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YBL OCA].
+
Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YBL OCA].
==Reference==
==Reference==
Line 27: Line 31:
[[Category: Telomer]]
[[Category: Telomer]]
[[Category: Tetrahymena]]
[[Category: Tetrahymena]]
-
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 16:07:05 2008''
+
 
 +
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 19:28:24 2008''

Revision as of 16:28, 28 July 2008

Image:1ybl.png

Template:STRUCTURE 1ybl

NMR structure of the i-motif tetramer of d(AACCCC)

Template:ABSTRACT PUBMED 15647504

About this Structure

Full experimental information is available from OCA.

Reference

i-motif solution structure and dynamics of the d(AACCCC) and d(CCCCAA) tetrahymena telomeric repeats., Esmaili N, Leroy JL, Nucleic Acids Res. 2005 Jan 12;33(1):213-24. Print 2005. PMID:15647504

Page seeded by OCA on Mon Jul 28 19:28:24 2008

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ybl"
Personal tools