Journal
PROTEINS-STRUCTURE FUNCTION AND BIOINFORMATICS
Volume 85, Issue 12, Pages 2209-2216Publisher
WILEY
DOI: 10.1002/prot.25385
Keywords
structural biology; MD simulations; archaea S-layer proteins; S-8 crown in protein cavities; coiled-coil protein; dynamic light scattering; right-handed coiled coil
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Funding
- Natural Science and Engineering Council [RGPIN 342077-2012, RGPIN-004954-2017, STPGP 479210-2015]
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Elemental sulfur exists primarily as an S-8(0) ring and serves as terminal electron acceptor for a variety of sulfur-fermenting bacteria. Hyperthermophilic archaea from black smoker vents are an exciting research tool to advance our knowledge of sulfur respiration under extreme conditions. Here, we use a hybrid method approach to demonstrate that the proteinaceous cavities of the S-layer nano-tube of the hyperthermophilic archaeon Staphylothermus marinus act as a storage reservoir for cyclo-octasulfur (S-8). Fully atomistic molecular dynamics (MD) simulations were performed and the method of multiconfigurational thermodynamic integration was employed to compute the absolute free energy for transferring a ring of elemental sulfur (S-8) from an aqueous bath into the largest hydrophobic cavity of a fragment of archaeal tetrabrachion. Comparisons with earlier MD studies of the free energy of hydration as a function of water occupancy in the same cavity of archaeal tetrabrachion show that the sulfur ring is energetically favored over water.
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