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| - | [[Image:1q6h.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1q6h| PDB=1q6h | SCENE= }} | | {{STRUCTURE_1q6h| PDB=1q6h | SCENE= }} |
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| - | '''Crystal structure of a truncated form of FkpA from Escherichia coli'''
| + | ===Crystal structure of a truncated form of FkpA from Escherichia coli=== |
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| - | ==Overview==
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| - | The protein FkpA from the periplasm of Escherichia coli exhibits both cis/trans peptidyl-prolyl isomerase (PPIase) and chaperone activities. The crystal structure of the protein has been determined in three different forms: as the full-length native molecule, as a truncated form lacking the last 21 residues, and as the same truncated form in complex with the immunosuppressant ligand, FK506. FkpA is a dimeric molecule in which the 245-residue subunit is divided into two domains. The N-terminal domain includes three helices that are interlaced with those of the other subunit to provide all inter-subunit contacts maintaining the dimeric species. The C-terminal domain, which belongs to the FK506-binding protein (FKBP) family, binds the FK506 ligand. The overall form of the dimer is V-shaped, and the different crystal structures reveal a flexibility in the relative orientation of the two C-terminal domains located at the extremities of the V. The deletion mutant FkpNL, comprising the N-terminal domain only, exists in solution as a mixture of monomeric and dimeric species, and exhibits chaperone activity. By contrast, a deletion mutant comprising the C-terminal domain only is monomeric, and although it shows PPIase activity, it is devoid of chaperone function. These results suggest that the chaperone and catalytic activities reside in the N and C-terminal domains, respectively. Accordingly, the observed mobility of the C-terminal domains of the dimeric molecule could effectively adapt these two independent folding functions of FkpA to polypeptide substrates. | + | The line below this paragraph, {{ABSTRACT_PUBMED_14672666}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 14672666 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_14672666}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Peptidyl-prolyl isomerase]] | | [[Category: Peptidyl-prolyl isomerase]] |
| | [[Category: Periplasm]] | | [[Category: Periplasm]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:55:30 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 07:18:24 2008'' |
Revision as of 04:18, 29 July 2008
Template:STRUCTURE 1q6h
Crystal structure of a truncated form of FkpA from Escherichia coli
Template:ABSTRACT PUBMED 14672666
About this Structure
1Q6H is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Structural and functional studies of FkpA from Escherichia coli, a cis/trans peptidyl-prolyl isomerase with chaperone activity., Saul FA, Arie JP, Vulliez-le Normand B, Kahn R, Betton JM, Bentley GA, J Mol Biol. 2004 Jan 9;335(2):595-608. PMID:14672666
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