1t9e
From Proteopedia
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[[Image:1t9e.gif|left|200px]] | [[Image:1t9e.gif|left|200px]] | ||
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| - | + | {{STRUCTURE_1t9e| PDB=1t9e | SCENE= }} | |
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'''NMR solution structure of a disulfide analogue of the cyclic sunflower trypsin inhibitor SFTI-1''' | '''NMR solution structure of a disulfide analogue of the cyclic sunflower trypsin inhibitor SFTI-1''' | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1T9E is a [[Single protein]] structure | + | 1T9E is a [[Single protein]] structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1T9E OCA]. |
==Reference== | ==Reference== | ||
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[[Category: Craik, D J.]] | [[Category: Craik, D J.]] | ||
[[Category: Korsinczky, M L.J.]] | [[Category: Korsinczky, M L.J.]] | ||
| - | [[Category: | + | [[Category: Disulfide mutant]] |
| - | [[Category: | + | [[Category: Nmr]] |
| - | [[Category: | + | [[Category: Sunflower trypsin inhibitor]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 09:42:09 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 06:42, 3 May 2008
NMR solution structure of a disulfide analogue of the cyclic sunflower trypsin inhibitor SFTI-1
Overview
SFTI-1 is a novel 14 amino acid peptide comprised of a circular backbone constrained by three proline residues, a hydrogen-bond network, and a single disulfide bond. It is the smallest and most potent known Bowman-Birk trypsin inhibitor and the only one with a cyclic peptidic backbone. The solution structure of [ABA(3,11)]SFTI-1, a disulfide-deficient analogue of SFTI-1, has been determined by (1)H NMR spectroscopy. The lowest energy structures of native SFTI-1 and [ABA(3,11)]SFTI-1 are similar and superimpose with a root-mean-square deviation over the backbone and heavy atoms of 0.26 +/- 0.09 and 1.10 +/- 0.22 A, respectively. The disulfide bridge in SFTI-1 was found to be a minor determinant for the overall structure, but its removal resulted in a slightly weakened hydrogen-bonding network. To further investigate the role of the disulfide bridge, NMR chemical shifts for the backbone H(alpha) protons of two disulfide-deficient linear analogues of SFTI-1, [ABA(3,11)]SFTI-1[6,5] and [ABA(3,11)]SFTI-1[1,14] were measured. These correspond to analogues of the cleavage product of SFTI-1 and a putative biosynthetic precursor, respectively. In contrast with the cyclic peptide, it was found that the disulfide bridge is essential for maintaining the structure of these open-chain analogues. Overall, the hydrogen-bond network appears to be a crucial determinant of the structure of SFTI-1 analogues.
About this Structure
1T9E is a Single protein structure. Full crystallographic information is available from OCA.
Reference
Disulfide bond mutagenesis and the structure and function of the head-to-tail macrocyclic trypsin inhibitor SFTI-1., Korsinczky ML, Clark RJ, Craik DJ, Biochemistry. 2005 Feb 1;44(4):1145-53. PMID:15667208 Page seeded by OCA on Sat May 3 09:42:09 2008
