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1aqz

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[[Image:1aqz.gif|left|200px]]
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{{STRUCTURE_1aqz| PDB=1aqz | SCENE= }}
{{STRUCTURE_1aqz| PDB=1aqz | SCENE= }}
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'''CRYSTAL STRUCTURE OF A HIGHLY SPECIFIC ASPERGILLUS RIBOTOXIN, RESTRICTOCIN'''
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===CRYSTAL STRUCTURE OF A HIGHLY SPECIFIC ASPERGILLUS RIBOTOXIN, RESTRICTOCIN===
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==Overview==
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BACKGROUND: Restriction, a highly specific ribotoxin made by the fungus Aspergillus restrictus, cleaves a single phosphodiester bond in the 28S RNA of eukaryotic ribosomes, inhibiting protein synthesis. The sequence around this cleavage site is a binding site for elongation factors, and is conserved in all cytoplasmic ribosomes. The catalytic mechanism of restrictocin and the reasons for its high substrate specificity are unknown. No structure has been determined for any other member of the Aspergillus ribotoxin family. RESULTS: The crystal structure of restrictocin was determined at 2.1 A resolution by single isomorphous replacement and anomalous scattering techniques, and refined to 1.7 A resolution using synchrotron Laue data. The structural core of the protein, in which a three-turn alpha helix is packed against a five-stranded antiparallel beta sheet, can be well aligned with that of ribonuclease T1. Large positively charged peripheral loops near the active site construct a platform with a concave surface for RNA binding. CONCLUSIONS: Restriction appears to combine the catalytic components of T1 ribonucleases with the base recognition components of Sa ribonucleases. Modeling studies using an NMR structure of an RNA substrate analog suggest that the tertiary structure of the substrate RNA is important in protein-RNA recognition, fitting closely into the concavity of the presumed binding site. We speculate that the large 39-residue loop L3, which has similarities to loops found in lectin sugar-binding domains, may be responsible for restrictocin's ability to cross cell membranes.
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(as it appears on PubMed at http://www.pubmed.gov), where 8805570 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8805570}}
==About this Structure==
==About this Structure==
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[[Category: Ribosome-inactivating protein]]
[[Category: Ribosome-inactivating protein]]
[[Category: Ribotoxin]]
[[Category: Ribotoxin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:36:26 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 17:26:40 2008''

Revision as of 14:26, 30 June 2008

Image:1aqz.png

Template:STRUCTURE 1aqz

CRYSTAL STRUCTURE OF A HIGHLY SPECIFIC ASPERGILLUS RIBOTOXIN, RESTRICTOCIN

Template:ABSTRACT PUBMED 8805570

About this Structure

1AQZ is a Single protein structure of sequence from Aspergillus restrictus. Full crystallographic information is available from OCA.

Reference

Insights into specificity of cleavage and mechanism of cell entry from the crystal structure of the highly specific Aspergillus ribotoxin, restrictocin., Yang X, Moffat K, Structure. 1996 Jul 15;4(7):837-52. PMID:8805570

Page seeded by OCA on Mon Jun 30 17:26:40 2008

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