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2gjh

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{{STRUCTURE_2gjh| PDB=2gjh | SCENE= }}
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'''NMR Structure of CFr (C-terminal fragment of computationally designed novel-topology protein Top7)'''
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===NMR Structure of CFr (C-terminal fragment of computationally designed novel-topology protein Top7)===
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==Overview==
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We recently used computational protein design to create an extremely stable, globular protein, Top7, with a sequence and fold not observed previously in nature. Since Top7 was created in the absence of genetic selection, it provides a rare opportunity to investigate aspects of the cellular protein production and surveillance machinery that are subject to natural selection. Here we show that a portion of the Top7 protein corresponding to the final 49 C-terminal residues is efficiently mis-translated and accumulates at high levels in Escherichia coli. We used circular dichroism, size-exclusion chromatography, small-angle X-ray scattering, analytical ultra-centrifugation, and NMR spectroscopy to show that the resulting C-terminal fragment (CFr) protein adopts a compact, extremely stable, homo-dimeric structure. Based on the solution structure, we engineered an even more stable variant of CFr by disulfide-induced covalent circularisation that should be an excellent platform for design of novel functions. The accumulation of high levels of CFr exposes the high error rate of the protein translation machinery. The rarity of correspondingly stable fragments in natural proteins coupled with the observation that high quality ribosome binding sites are found to occur within E. coli protein-coding regions significantly less often than expected by random chance implies a stringent evolutionary pressure against protein sub-fragments that can independently fold into stable structures. The symmetric self-association between two identical mis-translated CFr sub-domains to generate an extremely stable structure parallels a mechanism for natural protein-fold evolution by modular recombination of protein sub-structures.
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(as it appears on PubMed at http://www.pubmed.gov), where 16949611 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16949611}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GJH OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GJH OCA].
==Reference==
==Reference==
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[[Category: Dantas, G.]]
[[Category: Dantas, G.]]
[[Category: Obligate symmetric homo-dimer]]
[[Category: Obligate symmetric homo-dimer]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:33:23 2008''

Revision as of 20:33, 27 July 2008

Image:2gjh.png

Template:STRUCTURE 2gjh

NMR Structure of CFr (C-terminal fragment of computationally designed novel-topology protein Top7)

Template:ABSTRACT PUBMED 16949611

About this Structure

Full experimental information is available from OCA.

Reference

Mis-translation of a computationally designed protein yields an exceptionally stable homodimer: implications for protein engineering and evolution., Dantas G, Watters AL, Lunde BM, Eletr ZM, Isern NG, Roseman T, Lipfert J, Doniach S, Tompa M, Kuhlman B, Stoddard BL, Varani G, Baker D, J Mol Biol. 2006 Oct 6;362(5):1004-24. Epub 2006 Aug 4. PMID:16949611

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