Structure of poly (I).poly (A).poly (I).

Abstract:

:The molecular structure of poly (I).poly (A).poly (I) has been determined and refined using the continuous intensity data on layer lines in the x-ray diffraction pattern obtained from an oriented fiber of this polymorphic RNA complex. The polymer forms a 12-fold right-handed triple-helix of pitch 39.7A and each base-triplet is stabilized by quasi Crick-Watson-Hoogsteen hydrogen bonds. The ribose rings in all the three strands have C3'-endo conformations. The final R-value for this best structure is 0.24 and the x-ray fit is significantly superior to all the alternative structures where the different chains might have different furanose conformations. This all-purine triple-helix, counter-intuitively, has a diameter roughly 3A shorter than that of DNA and RNA triple-helices containing a homopurine and two complementary homopyrimidine strands. Its compact, grooveless cylindrical shape is consistent with the lack of lateral organization.

journal_name

J Biomol Struct Dyn

authors

Chandrasekaran R,Giacometti A,Arnott S

doi

10.1080/07391102.2000.10506591

subject

Has Abstract

pub_date

2000-06-01 00:00:00

pages

1035-45

issue

6

eissn

0739-1102

issn

1538-0254

journal_volume

17

pub_type

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