1iz6
From Proteopedia
(New page: 200px<br /><applet load="1iz6" size="450" color="white" frame="true" align="right" spinBox="true" caption="1iz6, resolution 2.0Å" /> '''Crystal Structure of ...) |
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| - | [[Image:1iz6.jpg|left|200px]]<br /><applet load="1iz6" size=" | + | [[Image:1iz6.jpg|left|200px]]<br /><applet load="1iz6" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="1iz6, resolution 2.0Å" /> | caption="1iz6, resolution 2.0Å" /> | ||
'''Crystal Structure of Translation Initiation Factor 5A from Pyrococcus Horikoshii'''<br /> | '''Crystal Structure of Translation Initiation Factor 5A from Pyrococcus Horikoshii'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Eukaryotic initiation factor 5A (eIF-5A) is ubiquitous in eukaryotes and | + | 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== | ==About this Structure== | ||
| - | 1IZ6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pyrococcus_horikoshii Pyrococcus horikoshii]. Full crystallographic information is available from [http:// | + | 1IZ6 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pyrococcus_horikoshii Pyrococcus horikoshii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1IZ6 OCA]. |
==Reference== | ==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 | + | 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:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12761201 12761201] |
[[Category: Pyrococcus horikoshii]] | [[Category: Pyrococcus horikoshii]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
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[[Category: sh3-like barrel]] | [[Category: sh3-like barrel]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:17:15 2008'' |
Revision as of 11:17, 21 February 2008
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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
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