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Stability and fluctuations of amide hydrogen bonds in a bacterial cytochrome c: a molecular dynamics study

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Abstract

Molecular dynamics (MD) simulations on a bacterial cytochrome c were performed to investigate the lifetime and fluctuations of backbone hydrogen bonds and to correlate these data with protection factors for hydrogen exchange measured by NMR spectroscopy (Bartalesi et al. in Biochemistry, 42:10923–10930, 2003). The MD simulations provide a consistent pattern in that long lifetimes of hydrogen bonds go along with small amplitude fluctuations. In agreement with experiments, differences in stability were found with a rather flexible N-terminal segment as compared with a more rigid C-terminal part. Protection factors of backbone hydrogen exchange correlate strongly with the number of contacts but also with hydrogen-bond occupancy, hydrogen-bond survival times, as well as the inverse of fluctuations of backbone atoms and hydrogen-bond lengths derived from MD simulation data. We observed a conformational transition in the C-terminal loop, and significant motion in the N-terminal loop, which can be interpreted as being the structural units involved in the onset of the protein unfolding process in agreement with experimental evidence on mitochondrial cytochrome c.

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Abbreviations

Bcytc:

Bacterial cytochrome c

MC:

Monte Carlo

MD:

Molecular dynamics

N c n :

Number of residues which are in contact with residue n

N h n :

Number of backbone (N–H) hydrogen bonds involving residue n

PDB:

Protein Data Bank

PFE:

Protection factor elements

Q(occupancy):

Hydrogen-bond occupancy

RMS:

Root mean square

RMSF:

RMS fluctuations

RMSF−1(backbone):

Inverse of the backbone atom RMSF

RMSF−1(N–O):

Inverse of the N–O atom-pair distance (hydrogen-bond length) RMSF

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Acknowledgements

We would like to thank Franz X. Schmidt and Hiroshi Ishikita for useful discussions. We also thank Antonio Rosato, who kindly provided us with experimental data in electronic form. This project was supported by the Deutsche Forschungsgemeinschaft SFB 498, Project A5, Forschergruppe Project KN 329/5-1/5-2, GRK 80/2, GRK 268/2, GRK 788/1.

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Correspondence to Ernst-Walter Knapp.

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Gernot Kieseritzky and Giulia Morra both contributed equally to this work.

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Kieseritzky, G., Morra, G. & Knapp, EW. Stability and fluctuations of amide hydrogen bonds in a bacterial cytochrome c: a molecular dynamics study. J Biol Inorg Chem 11, 26–40 (2006). https://doi.org/10.1007/s00775-005-0041-1

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