Energetics of activation of GTP hydrolysis on the ribosome
2013 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 4, 1733- p.Article in journal (Refereed) Published
Several of the steps in protein synthesis on the ribosome utilize hydrolysis of guanosine triphosphate (GTP) as the driving force. This reaction is catalyzed by translation factors that become activated upon binding to the ribosome. The recently determined crystal structure of an elongation factor-Tuternary complex bound to the ribosome allows the energetics of GTP activation to be explored by computer simulations. A central problem regards the role of the universally conserved histidine, which has been proposed to act as a general base for guanosine triphosphate hydrolysis. Here we report a detailed energetic and structural analysis of different possible protonation states that could be involved in activation of the reaction. We show that the histidine cannot act as a general base, but must be protonated and in its active conformation to promote GTP hydrolysis. We further show that the sarcin-ricin loop of the ribosome spontaneously drives the histidine into the correct conformation for GTP activation.
Place, publisher, year, edition, pages
2013. Vol. 4, 1733- p.
IdentifiersURN: urn:nbn:se:uu:diva-202598DOI: 10.1038/ncomms2741ISI: 000318872100090OAI: oai:DiVA.org:uu-202598DiVA: diva2:632351
FunderSwedish Research CouncilKnut and Alice Wallenberg FoundationSwedish National Infrastructure for Computing (SNIC), 002/12-26