1q89
From Proteopedia
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'''Crystal structure of the C-domain of the T.vaginalis Inr binding protein, IBP39 (cubic crystal form)''' | '''Crystal structure of the C-domain of the T.vaginalis Inr binding protein, IBP39 (cubic crystal form)''' | ||
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[[Category: Johnson, P J.]] | [[Category: Johnson, P J.]] | ||
[[Category: Schumacher, M A.]] | [[Category: Schumacher, M A.]] | ||
| - | [[Category: | + | [[Category: Core promoter]] |
| - | [[Category: | + | [[Category: Initator binding protein]] |
| - | [[Category: | + | [[Category: Inr]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:59:16 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 02:59, 3 May 2008
Crystal structure of the C-domain of the T.vaginalis Inr binding protein, IBP39 (cubic crystal form)
Overview
Transcription start site selection in eukaryotes is mediated through combinations of the TATA, initiator (Inr), and downstream promoter elements (DPE). In Trichomonas vaginalis, a parabasalian flagellate thought to represent an ancient eukaryote lineage, the Inr appears to be solely responsible for start site selection and is recognized by the initiator binding protein 39 kDa (IBP39). IBP39 contains an N-terminal Inr binding domain (IBD) connected via a flexible linker to a C-terminal domain (C domain). Here we present crystal structures of the apoIBD and IBD-Inr complexes and the C domain. The IBD structures reveal a winged-helix motif with prokaryotic and eukaryotic features and a scaffold similar to that of ETS-family proteins. The C domain structure and biochemical studies indicate that it interacts with the T. vaginalis RNAP II large subunit C-terminal domain. These data suggest that binding of IBP39 to the Inr directly recruits RNAP II and in this way initiates transcription.
About this Structure
1Q89 is a Single protein structure of sequence from Trichomonas vaginalis. Full crystallographic information is available from OCA.
Reference
Structural basis of core promoter recognition in a primitive eukaryote., Schumacher MA, Lau AO, Johnson PJ, Cell. 2003 Nov 14;115(4):413-24. PMID:14622596 Page seeded by OCA on Sat May 3 05:59:16 2008
