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| [[Image:1ezp.jpg|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1ezp| PDB=1ezp | SCENE= }} | | {{STRUCTURE_1ezp| PDB=1ezp | SCENE= }} |
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| '''GLOBAL FOLD OF MALTODEXTRIN BINDING PROTEIN COMPLEXED WITH BETA-CYCLODEXTRIN USING PEPTIDE ORIENTATIONS FROM DIPOLAR COUPLINGS'''
| | ===GLOBAL FOLD OF MALTODEXTRIN BINDING PROTEIN COMPLEXED WITH BETA-CYCLODEXTRIN USING PEPTIDE ORIENTATIONS FROM DIPOLAR COUPLINGS=== |
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| ==Overview==
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| The global fold of maltose-binding protein in complex with the substrate beta-cyclodextrin was determined by solution NMR methods. The two-domain protein is comprised of a single polypeptide chain of 370 residues, with a molecular mass of 42 kDa. Distance information in the form of H(N)-H(N), H(N)-CH(3) and CH(3)-CH(3) NOEs was recorded on (15)N, (2)H and (15)N, (13)C, (2)H-labeled proteins with methyl protonation in Val, Leu, and Ile (C(delta1) only) residues. Distances to methyl protons, critical for the structure determination, comprised 77 % of the long-range restraints. Initial structures were calculated on the basis of 1943 NOEs, 48 hydrogen bond and 555 dihedral angle restraints. A global pair-wise backbone rmsd of 5.5 A was obtained for these initial structures with rmsd values for the N and C domains of 2.4 and 3.8 A, respectively. Direct refinement against one-bond (1)H(N)-(15)N, (13)C(alpha)-(13)CO, (15)N-(13)CO, two-bond (1)H(N)-(13)CO and three-bond (1)H(N)-(13)C(alpha) dipolar couplings resulted in structures with large numbers of dipolar restraint violations. As an alternative to direct refinement against measured dipolar couplings we have developed an approach where discrete orientations are calculated for each peptide plane on the basis of the dipolar couplings described above. The orientation which best matches that in initial NMR structures calculated from NOE and dihedral angle restraints exclusively is used to refine further the structures using a new module written for CNS. Modeling studies from four different proteins with diverse structural motifs establishes the utility of the methodology. When applied to experimental data recorded on MBP the precision of the family of structures generated improves from 5.5 to 2.2 A, while the rmsd with respect to the X-ray structure (1dmb) is reduced from 5.1 to 3.3 A.
| | The line below this paragraph, {{ABSTRACT_PUBMED_10864509}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 10864509 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_10864509}} |
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| ==About this Structure== | | ==About this Structure== |
| 1EZP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EZP OCA]. | | 1EZP is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EZP OCA]. |
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| ==Reference== | | ==Reference== |
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| [[Category: Methyl labeling]] | | [[Category: Methyl labeling]] |
| [[Category: Residual diplar coupling]] | | [[Category: Residual diplar coupling]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:42:53 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 02:15:46 2008'' |