1s9s
From Proteopedia
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SOLUTION STRUCTURE OF MLV PSI SITE
Overview
The full length, positive-strand genome of the Moloney Murine Leukemia Virus contains a "core encapsidation signal" that is essential for efficient genome packaging during virus assembly. We have determined the structure of a 101-nucleotide RNA that contains this signal (called mPsi) using a novel isotope-edited NMR approach. The method is robust and should be generally applicable to larger RNAs. mPsi folds into three stem loops, two of which (SL-C and SL-D) co-stack to form an extended helix. The third stem loop (SL-B) is connected to SL-C by a flexible, four-nucleotide linker. The structure contains five mismatched base-pairs, an unusual C.CG base-triple platform, and a novel "A-minor K-turn," in which unpaired adenosine bases A340 and A341 of a GGAA bulge pack in the minor groove of a proximal stem, and a bulged distal uridine (U319) forms a hydrogen bond with the phosphodiester of A341. Phylogenetic analyses indicate that these essential structural elements are conserved among the murine C-type retroviruses.
About this Structure
1S9S is a Protein complex structure of sequences from [1]. Full crystallographic information is available from OCA.
Reference
NMR structure of the 101-nucleotide core encapsidation signal of the Moloney murine leukemia virus., D'Souza V, Dey A, Habib D, Summers MF, J Mol Biol. 2004 Mar 19;337(2):427-42. PMID:15003457
Page seeded by OCA on Thu Mar 20 14:02:11 2008
Categories: Protein complex | Dey, A. | Habib, D. | Souza, V D. | Summers, M F. | A-c mismatch | A-minor k-turn | Bulge | G-a mismatch | G-u mismatch | Mlv | Stem loop | U-u mismatch
