1nli: Difference between revisions

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[[Image:1nli.jpg|left|200px]]
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{{STRUCTURE_1nli|  PDB=1nli  |  SCENE=  }}  
{{STRUCTURE_1nli|  PDB=1nli  |  SCENE=  }}  


'''Complex of [E160A-E189A] trichosanthin and adenine'''
===Complex of [E160A-E189A] trichosanthin and adenine===




==Overview==
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Trichosanthin is a ribosome-inactivating protein that cleaves specifically the N-glycosidic bond of A-4324 of 28S rRNA. Trichosanthin and its variant [E160A-E189A]-trichosanthin were found to bind an adenine base with a K(d) value of approximately 0.2mM. To determine how this doubly mutated variant of trichosanthin interacts with adenine, the co-crystal structure of [E160A-E189A]-trichosanthin and adenine was resolved to 0.193nm which revealed that the active site conformation of the doubly mutated variant is isomorphous to wild-type trichosanthin. Water molecules were found at locations corresponding to the eliminated side chain of Glu-160 and Glu-189. On the other hand, the adenine base interacted with [E160A-E189A]-trichosanthin in a manner similar to that in wild-type trichosanthin. Our structural analysis illustrates that Glu-160 and Glu-189 in trichosanthin do not play an important role in maintaining the active site conformation and binding adenine, an essential step for substrate-enzyme interaction. On the other hand, removal of two glutamate residues changed a large patch of negatively charged surface to a positive charge, which may account for the destabilization of the oxocarbenium-like transition-state and the significant decrease in ribosome-inactivating activity in [E160A-E189A]-trichosanthin.
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{{ABSTRACT_PUBMED_12676436}}


==About this Structure==
==About this Structure==
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[[Category: Protein-dna complex]]
[[Category: Protein-dna complex]]
[[Category: Ribosome-inactivating protein]]
[[Category: Ribosome-inactivating protein]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 13:04:27 2008''

Revision as of 10:04, 29 July 2008

File:1nli.png

Template:STRUCTURE 1nli

Complex of [E160A-E189A] trichosanthin and adenine

Template:ABSTRACT PUBMED 12676436

About this Structure

1NLI is a Single protein structure of sequence from Trichosanthes kirilowii. Full crystallographic information is available from OCA.

Reference

Structural basis for the interaction of [E160A-E189A]-trichosanthin with adenine., Shaw PC, Wong KB, Chan DS, Williams RL, Toxicon. 2003 Apr;41(5):575-81. PMID:12676436

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