1z5h
From Proteopedia
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Crystal structures of the Tricorn interacting Factor F3 from Thermoplasma acidophilum
Overview
The tricorn interacting factor F3 is an 89 kDa zinc aminopeptidase from, the archaeon Thermoplasma acidophilum. Together with the tricorn, interacting factors F1 and F2, F3 degrades the tricorn protease products, and thus completes the proteasomal degradation pathway by generating free, amino acids. Here, we present the crystal structures of F3 in three, different conformations at 2.3 A resolution. The zinc aminopeptidase is, composed of four domains: an N-terminal saddle-like beta-structure domain;, a thermolysin-like catalytic domain; a small barrel-like beta-structure, domain; and an alpha-helical C-terminal domain, the latter forming a deep, cavity at the active site. Three crystal forms provide snapshots of the, molecular dynamics of F3 where the C-terminal domain can adapt to form an, open, an intermediate and a nearly closed cavity, respectively. With the, conserved Zn(2+)-binding motifs HEXXH and NEXFA as well as the N-terminal, substrate-anchoring glutamate residues, F3 together with the leukotriene, A4 hydrolase, represents a novel gluzincin subfamily of aminoproteases. We, discuss the functional implications of these structures with respect to, the underlying catalytic mechanism, substrate recognition and processing, and possible component interactions.
About this Structure
1Z5H is a Single protein structure of sequence from Thermoplasma acidophilum with SO4 and ZN as ligands. Full crystallographic information is available from OCA.
Reference
Crystal structures of the tricorn interacting factor F3 from Thermoplasma acidophilum, a zinc aminopeptidase in three different conformations., Kyrieleis OJ, Goettig P, Kiefersauer R, Huber R, Brandstetter H, J Mol Biol. 2005 Jun 17;349(4):787-800. Epub 2005 Apr 26. PMID:15893768
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