2006
Molecular dynamics simulations of sarcin-ricin rRNA motif
ŠPAČKOVÁ, Naděžda a Jiří ŠPONERZákladní údaje
Originální název
Molecular dynamics simulations of sarcin-ricin rRNA motif
Název česky
Molecular dynamics simulations of sarcin-ricin rRNA motif
Autoři
ŠPAČKOVÁ, Naděžda (203 Česká republika) a Jiří ŠPONER (203 Česká republika, garant)
Vydání
Nucleic Acids Research, Oxford University Press, 2006, 0006-3465
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10403 Physical chemistry
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Kód RIV
RIV/00216224:14310/06:00016779
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000235291300039
Klíčová slova anglicky
molecular dynamics;sarcin-ricin
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 29. 6. 2007 00:15, Olga Křížová
V originále
Explicit solvent molecular dynamics (MD) simulations were carried out for sarcinricin domain (SRD) motifs from 23S (Escherichia coli) and 28S (rat) rRNAs. The SRD motif consists of GAGA tetraloop, G-bulged cross-strand A-stack, flexible region and duplex part. Detailed analysis of the overall dynamics, base pairing, hydration, cation binding and other SRD features is presented. The SRD is surprisingly static in multiple 25 ns long simulations and lacks any non-local motions, with root mean square deviation (r.m.s.d.) values between averaged MD and high-resolution X-ray structures of 11.4 A . Modest dynamics is observed in the tetraloop, namely, rotation of adenine in its apex and subtle reversible shift of the tetraloop with respect to the adjacent base pair.The deformedflexible region in low-resolution rat X-ray structure is repaired by simulations. The simulations reveal few backbone flips, which do not affect positions of bases and do not indicate a force field imbalance. Non-Watson Crick base pairs are rigid and mediated by longresidency water molecules while there are several modest cation-binding sites around SRD. In summary, SRD is an unusually stiff rRNA building block. Its intrinsic structural and dynamical signatures seen in simulations are strikingly distinct from other rRNA motifs such as Loop E and Kink-turns.
Česky
Explicit solvent molecular dynamics (MD) simulations were carried out for sarcinricin domain (SRD) motifs from 23S (Escherichia coli) and 28S (rat) rRNAs. The SRD motif consists of GAGA tetraloop, G-bulged cross-strand A-stack, flexible region and duplex part. Detailed analysis of the overall dynamics, base pairing, hydration, cation binding and other SRD features is presented. The SRD is surprisingly static in multiple 25 ns long simulations and lacks any non-local motions, with root mean square deviation (r.m.s.d.) values between averaged MD and high-resolution X-ray structures of 11.4 A . Modest dynamics is observed in the tetraloop, namely, rotation of adenine in its apex and subtle reversible shift of the tetraloop with respect to the adjacent base pair.The deformedflexible region in low-resolution rat X-ray structure is repaired by simulations. The simulations reveal few backbone flips, which do not affect positions of bases and do not indicate a force field imbalance. Non-Watson Crick base pairs are rigid and mediated by longresidency water molecules while there are several modest cation-binding sites around SRD. In summary, SRD is an unusually stiff rRNA building block. Its intrinsic structural and dynamical signatures seen in simulations are strikingly distinct from other rRNA motifs such as Loop E and Kink-turns.
Návaznosti
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