2p81
From Proteopedia
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|ACTIVITY= | |ACTIVITY= | ||
|GENE= en ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 Drosophila melanogaster]) | |GENE= en ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=7227 Drosophila melanogaster]) | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY=[[1ztr|1ZTR]], [[1enh|1ENH]] | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2p81 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2p81 OCA], [http://www.ebi.ac.uk/pdbsum/2p81 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2p81 RCSB]</span> | ||
}} | }} | ||
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[[Category: protein folding]] | [[Category: protein folding]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 04:31:49 2008'' |
Revision as of 01:31, 31 March 2008
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| Gene: | en (Drosophila melanogaster) | ||||||
| Related: | 1ZTR, 1ENH
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Engrailed homeodomain helix-turn-helix motif
Overview
Helices 2 and 3 of Engrailed homeodomain (EnHD) form a helix-turn-helix (HTH) motif. This common motif is believed not to fold independently, which is the characteristic feature of a motif rather than a domain. But we found that the EnHD HTH motif is monomeric and folded in solution, having essentially the same structure as in full-length protein. It had a sigmoidal thermal denaturation transition. Both native backbone and local tertiary interactions were formed concurrently at 4 x 10(5) s(-1) at 25 degrees C, monitored by IR and fluorescence T-jump kinetics, respectively, the same rate constant as for the fast phase in the folding of EnHD. The HTH motif, thus, is an ultrafast-folding, natural protein domain. Its independent stability and appropriate folding kinetics account for the stepwise folding of EnHD, satisfy fully the criteria for an on-pathway intermediate, and explain the changes in mechanism of folding across the homeodomain family. Experiments on mutated and engineered fragments of the parent protein with different probes allowed the assignment of the observed kinetic phases to specific events to show that EnHD is not an example of one-state downhill folding.
About this Structure
2P81 is a Single protein structure of sequence from Drosophila melanogaster. Full crystallographic information is available from OCA.
Reference
The helix-turn-helix motif as an ultrafast independently folding domain: the pathway of folding of Engrailed homeodomain., Religa TL, Johnson CM, Vu DM, Brewer SH, Dyer RB, Fersht AR, Proc Natl Acad Sci U S A. 2007 May 29;104(22):9272-7. Epub 2007 May 18. PMID:17517666
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