NMR Distance Restraints At Low temperatures : An Application To
DNA Hairpin

J 2005

NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin

MATEJKOVÁ, Michaela, Petr NOVÁK, Radovan FIALA, Petr PADRTA, Vladimír SKLENÁŘ et. al.

Základní údaje

Originální název

NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin

Název česky

Měření a extrakce experimentálních dat z NMR spekter za nízkých teplot : Aplikace metody pro DNA hairpin.

Autoři

MATEJKOVÁ, Michaela, Petr NOVÁK, Radovan FIALA, Petr PADRTA a Vladimír SKLENÁŘ

Vydání

Materials Structure, Praha, The Czech and Slovak Cryst. Assoc. 2005, 1211-5894

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10600 1.6 Biological sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

NMR;structure;DNA

Štítky

DNA, NMR, structure

Změněno: 31. 5. 2005 15:02, Ing. Michaela Matejková

Anotace

ORIG CZ

V originále

Number of the experimental NMR distance restraints extracted at the ambient temperature is remarkably decreased by an internal mobility in a molecule, mostly chemical exchange. This problem can be avoided by NMR measurements at lower temperatures. To achieve the lowest temperature while keeping the liquid state and minimize the chemical exchange, the NMR experiments can be performed using the slowly cooled capillaries. The aim of the present study is to investigate possibilities of NMR measurements in liquid state at the temperatures below 273 K and applicability of this approach to a nucleic acid fragment. For this purpose, the d(GCGAAGC) hairpin has been chosen because its structure has been previously solved precisely by NMR spectroscopy. We have performed a new structure calculation of this molecule using the low temperature NMR measurements and compared the precision of the newly calculated and known structures. A series of the 2D-NOESY spectra with the mixing times in a range of 50 to 400 ms has been measured at 268K. The NOESY cross-peaks for the different mixing times were integrated using the SPARKY program and the results were employed to derive the inter-proton distance restraints. Then, the numbers of distance restraints extracted at 268 K and 303 K were compared. In case of nonexchangeable protons, these numbers were comparable due to the significant spectral overlaps in the NOESY spectra measured at 268 K. While, there was almost twice higher number of exchangeable proton distances extracted at 268 K compared to 303 K and these restraints helped increase the precision of the calculated structure of the d(GCGAAGC).

Česky

Cílem této studie bylo porovnat množství experimentálních dat získaných z NMR spekter hairpinu d(GCGAAGC), změřených při teplotách 303K a 268K. Při teplotách pod 273K dochází k spomalení chemické výměny a intramolekulárních pohybů, čímž se zvýší množství experimentálních NMR dat oproti situaci při běžné teplotě. To to se potrvdilo i v případě našeho vzorku.

Návaznosti

LN00A016, projekt VaV

Název: BIOMOLEKULÁRNÍ CENTRUM

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, Biomolekulární centrum

Citovat

MATEJKOVÁ, Michaela, Petr NOVÁK, Radovan FIALA, Petr PADRTA a Vladimír SKLENÁŘ. NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin. Materials Structure. Praha: The Czech and Slovak Cryst. Assoc., 2005, roč. 12, č. 1, s. 33-33. ISSN 1211-5894.

@article{571120,
   author = {Matejková, Michaela and Novák, Petr and Fiala, Radovan and Padrta, Petr and Sklenář, Vladimír},
   article_location = {Praha},
   article_number = {1},
   keywords = {NMR;structure;DNA},
   language = {eng},
   issn = {1211-5894},
   journal = {Materials Structure},
   title = {NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin},
   volume = {12},
   year = {2005}
}

TY  - JOUR
ID  - 571120
AU  - Matejková, Michaela - Novák, Petr - Fiala, Radovan - Padrta, Petr - Sklenář, Vladimír
PY  - 2005
TI  - NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin
JF  - Materials Structure
VL  - 12
IS  - 1
SP  - 33-33
EP  - 33-33
PB  - The Czech and Slovak Cryst. Assoc.
SN  - 12115894
KW  - NMR;structure;DNA
N2  - Number of the experimental NMR distance restraints extracted at the ambient temperature is remarkably decreased by an internal mobility in a molecule, mostly chemical exchange. This problem can be avoided by NMR measurements at lower temperatures. To achieve the lowest temperature while keeping the liquid state and minimize the chemical exchange, the NMR experiments can be performed using the slowly cooled capillaries. The aim of the present study is to investigate possibilities of NMR measurements in liquid state at the temperatures below 273 K and applicability of this approach to a nucleic acid fragment. For this purpose, the d(GCGAAGC) hairpin has been chosen because its structure has been previously solved precisely by NMR spectroscopy. We have performed a new structure calculation of this molecule using the low temperature NMR measurements and compared the precision of the newly calculated and known structures. A series of the 2D-NOESY spectra with the mixing times in a range of 50 to 400 ms has been measured at 268K. The NOESY cross-peaks for the different mixing times were integrated using the SPARKY program and the results were employed to derive the inter-proton distance restraints. Then, the numbers of distance restraints extracted at 268 K and 303 K were compared. In case of nonexchangeable protons, these numbers were comparable due to the significant spectral overlaps in the NOESY spectra measured at 268 K. While, there was almost twice higher number of exchangeable proton distances extracted at 268 K compared to 303 K and these restraints helped increase the precision of the calculated structure of the d(GCGAAGC).
ER  -

MATEJKOVÁ, Michaela, Petr NOVÁK, Radovan FIALA, Petr PADRTA a Vladimír SKLENÁŘ. NMR Distance Restraints At Low temperatures : An Application To DNA Hairpin. \textit{Materials Structure}. Praha: The Czech and Slovak Cryst. Assoc., 2005, roč.~12, č.~1, s.~33-33. ISSN~1211-5894.

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