Dissecting protein-RNA recognition sites

Ranjit Prasad Bahadur, Martin Zacharias, Joël Janin

Publikation: Beitrag in FachzeitschriftArtikelBegutachtung

106 Zitate (Scopus)

Abstract

We analyze the protein-RNA interfaces in 81 transient binary complexes taken from the Protein Data Bank. Those with tRNA or duplex RNA are larger than with single-stranded RNA, and comparable in size to protein-DNA interfaces. The protein side bears a strong positive electrostatic potential and resembles protein-DNA interfaces in its amino acid composition. On the RNA side, the phosphate contributes less, and the sugar much more, to the interaction than in protein-DNA complexes. On average, protein-RNA interfaces contain 20 hydrogen bonds, 7 that involve the phosphates, 5 the sugar 2′OH, and 6 the bases, and 32 water molecules. The average H-bond density per unit buried surface area is less with tRNA or single-stranded RNA than with duplex RNA. The atomic packing is also less compact in interfaces with tRNA. On the protein side, the main chain NH and Arg/Lys side chains account for nearly half of all H-bonds to RNA; the main chain CO and side chain acceptor groups, for a quarter. The 2′OH is a major player in protein-RNA recognition, and shape complementarity an important determinant, whereas electrostatics and direct base-protein interactions play a lesser part than in protein-DNA recognition.

OriginalspracheEnglisch
Seiten (von - bis)2705-2716
Seitenumfang12
FachzeitschriftNucleic Acids Research
Jahrgang36
Ausgabenummer8
DOIs
PublikationsstatusVeröffentlicht - Mai 2008
Extern publiziertJa

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