1iz6
From Proteopedia
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'''Crystal Structure of Translation Initiation Factor 5A from Pyrococcus Horikoshii''' | '''Crystal Structure of Translation Initiation Factor 5A from Pyrococcus Horikoshii''' | ||
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[[Category: Tanaka, I.]] | [[Category: Tanaka, I.]] | ||
[[Category: Yao, M.]] | [[Category: Yao, M.]] | ||
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| - | [[Category: | + | [[Category: Sh3-like barrel]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 20:36:40 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 17:36, 2 May 2008
Crystal Structure of Translation Initiation Factor 5A from Pyrococcus Horikoshii
Overview
Eukaryotic initiation factor 5A (eIF-5A) is ubiquitous in eukaryotes and archaebacteria and is essential for cell proliferation and survival. The crystal structure of the eIF-5A homologue (PhoIF-5A) from a hyperthermophilic archaebacterium Pyrococcus horikoshii OT3 was determined at 2.0 A resolution by the molecular replacement method. PhoIF-5A is predominantly composed of beta-strands comprising two distinct folding domains, an N-domain (residues 1-69) and a C-domain (residues 72-138), connected by a short linker peptide (residues 70-71). The N-domain has an SH3-like barrel, while the C-domain folds in an (oligonucleotide/oligosaccharide binding) OB fold. Comparison of the structure of PhoIF-5A with those of archaeal homologues from Methanococcus jannaschii and Pyrobaculum aerophilum showed that the N-domains could be superimposed with root mean square deviation (rmsd) values of 0.679 and 0.624 A, while the C-domains gave higher values of 1.824 and 1.329 A, respectively. Several lines of evidence suggest that eIF-5A functions as a biomodular protein capable of interacting with protein and nucleic acid. The surface representation of electrostatic potential shows that PhoIF-5A has a concave surface with positively charged residues between the N- and C-domains. In addition, a flexible long hairpin loop, L1 (residues 33-41), with a hypusine modification site is positively charged, protruding from the N-domain. In contrast, the opposite side of the concave surface at the C-domain is mostly negatively charged. These findings led to the speculation that the concave surface and loop L1 at the N-domain may be involved in RNA binding, while the opposite side of the concave surface in the C-domain may be involved in protein interaction.
About this Structure
1IZ6 is a Single protein structure of sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA.
Reference
Crystal structure of hyperthermophilic archaeal initiation factor 5A: a homologue of eukaryotic initiation factor 5A (eIF-5A)., Yao M, Ohsawa A, Kikukawa S, Tanaka I, Kimura M, J Biochem. 2003 Jan;133(1):75-81. PMID:12761201 Page seeded by OCA on Fri May 2 20:36:40 2008
