This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
4x33
From Proteopedia
(Difference between revisions)
| Line 9: | Line 9: | ||
== Function == | == Function == | ||
[[http://www.uniprot.org/uniprot/DPH3_YEAST DPH3_YEAST]] Required for the first step of diphthamide biosynthesis, the transfer of 3-amino-3-carboxypropyl from S-adenosyl-L-methionine to a histidine residue. Diphthamide is a post-translational modification of histidine which occurs in elongation factor 2. Required for conferring sensitivity to K.lactis zymocin.<ref>PMID:15485916</ref> [[http://www.uniprot.org/uniprot/ATS1_YEAST ATS1_YEAST]] May participate in regulatory interactions between microtubules and the cell cycle. | [[http://www.uniprot.org/uniprot/DPH3_YEAST DPH3_YEAST]] Required for the first step of diphthamide biosynthesis, the transfer of 3-amino-3-carboxypropyl from S-adenosyl-L-methionine to a histidine residue. Diphthamide is a post-translational modification of histidine which occurs in elongation factor 2. Required for conferring sensitivity to K.lactis zymocin.<ref>PMID:15485916</ref> [[http://www.uniprot.org/uniprot/ATS1_YEAST ATS1_YEAST]] May participate in regulatory interactions between microtubules and the cell cycle. | ||
| + | <div style="background-color:#fffaf0;"> | ||
| + | == Publication Abstract from PubMed == | ||
| + | Modification of wobble uridines of many eukaryotic tRNAs requires the Elongator complex, a highly conserved six-subunit eukaryotic protein assembly, as well as the Killer toxin-insensitive (Kti) proteins 11-14. Kti11 was additionally shown to be implicated in the biosynthesis of diphthamide, a post-translationally modified histidine of translation elongation factor 2. Recent data indicate that iron-bearing Kti11 functions as an electron donor to the [4Fe-4S] cluster of radical S-Adenosylmethionine enzymes, triggering the subsequent radical reaction. We show here that recombinant yeast Kti11 forms a stable 1 : 1 complex with Kti13. To obtain insights into the function of this heterodimer, the Kti11/Kti13 complex was purified to homogeneity, crystallized, and its structure determined at 1.45 A resolution. The importance of several residues mediating complex formation was confirmed by mutagenesis. Kti13 adopts a fold characteristic of RCC1-like proteins. The seven-bladed beta-propeller consists of a unique mixture of four- and three-stranded blades. In the complex, Kti13 orients Kti11 and restricts access to its electron-carrying iron atom, constraining the electron transfer capacity of Kti11. Based on these findings, we propose a role for Kti13, and discuss the possible functional implications of complex formation. DATABASE: Structural data have been submitted to the Protein Data Bank under accession number 4X33. | ||
| + | |||
| + | Structure of the Elongator cofactor complex Kti11/Kti13 provides insight into the role of Kti13 in Elongator-dependent tRNA modification.,Kolaj-Robin O, McEwen AG, Cavarelli J, Seraphin B FEBS J. 2015 Jan 21. doi: 10.1111/febs.13199. PMID:25604895<ref>PMID:25604895</ref> | ||
| + | |||
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
| + | </div> | ||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 09:54, 7 February 2015
Structure of the Elongator cofactor complex Kti11/Kti13 at 1.45A
| |||||||||||
