Titel:	Evolution of cation binding in the active sites of P-loop nucleoside triphosphatases in relation to the basic catalytic mechanism
Autor(en):	Shalaeva, Daria N. Cherepanov, Dmitry A. Galperin, Michael Y. Golovin, Andrey V. Mulkidjanian, Armen Y.
ORCID des Autors:	https://orcid.org/0000-0001-6286-4638 https://orcid.org/0000-0002-2265-5572 https://orcid.org/0000-0003-0582-2612 https://orcid.org/0000-0002-8908-4268 https://orcid.org/0000-0001-5844-3064
Zusammenfassung:	The ubiquitous P-loop fold nucleoside triphosphatases (NTPases) are typically activated by an arginine or lysine ‘finger’. Some of the apparently ancestral NTPases are, instead, activated by potassium ions. To clarify the activation mechanism, we combined comparative structure analysis with molecular dynamics (MD) simulations of Mg-ATP and Mg-GTP complexes in water and in the presence of potassium, sodium, or ammonium ions. In all analyzed structures of diverse P-loop NTPases, the conserved P-loop motif keeps the triphosphate chain of bound NTPs (or their analogs) in an extended, catalytically prone conformation, similar to that imposed on NTPs in water by potassium or ammonium ions. MD simulations of potassium-dependent GTPase MnmE showed that linking of alpha- and gamma phosphates by the activating potassium ion led to the rotation of the gamma-phosphate group yielding an almost eclipsed, catalytically productive conformation of the triphosphate chain, which could represent the basic mechanism of hydrolysis by P-loop NTPases.
Bibliografische Angaben:	eLife 2018;7:e37373, eLife Sciences Publications, 2018, S. 1-35
URL:	https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-201904101401
Schlagworte:	P-loop; nucleoside triphosphatases (NTPases); molecular dynamics simulations
Erscheinungsdatum:	11-Dez-2018
Lizenzbezeichnung:	CC0 1.0 Universal
URL der Lizenz:	http://creativecommons.org/publicdomain/zero/1.0/
Publikationstyp:	Einzelbeitrag in einer wissenschaftlichen Zeitschrift [article]
Enthalten in den Sammlungen:	FB06 - Hochschulschriften Open-Access-Publikationsfonds

Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons