1VRC image
Entry Detail
PDB ID:
1VRC
Keywords:
Title:
Complex of enzyme IIAmannose and the histidine-containing phosphocarrier protein HPr from escherichia coli nmr, restrained regularized mean structure
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2005-02-21
Release Date:
2005-04-19
Method Details:
Experimental Method:
Conformers Calculated:
100
Conformers Submitted:
2
Selection Criteria:
REGULARIZED MEAN STRUCTURES
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PTS system, mannose-specific IIAB component
Chain IDs:A, B
Chain Length:136
Number of Molecules:2
Biological Source:Escherichia coli
Polymer Type:polypeptide(L)
Description:Phosphocarrier protein HPr
Chain IDs:C, D
Chain Length:85
Number of Molecules:2
Biological Source:Escherichia coli
Ligand Molecules
Primary Citation
Solution NMR structure of the 48-kDa IIAMannose-HPr complex of the Escherichia coli mannose phosphotransferase system.
J.Biol.Chem. 280 20775 20784 (2005)
PMID: 15788390 DOI: 10.1074/jbc.M501986200

Abstact

The solution structure of the 48-kDa IIA(Man)-HPr complex of the mannose branch of the Escherichia coli phosphotransferase system has been solved by NMR using conjoined rigid body/torsion angle-simulated annealing on the basis of intermolecular nuclear Overhauser enhancement data and residual dipolar couplings. IIA(Man) is dimeric and has two symmetrically related binding sites per dimer for HPr. A convex surface on HPr, formed primarily by helices 1 and 2, interacts with a deep groove at the interface of the two subunits of IIA(Man). The interaction surface on IIA(Man) is predominantly helical, comprising helix 3 from the subunit that bears the active site His-10 and helices 1, 4, and 5 from the other subunit. The total buried accessible surface area at the protein-protein interface is 1450 A(2). The binding sites on the two proteins are complementary in terms of shape and distribution of hydrophobic, hydrophilic, and charged residues. The active site histidines, His-10 of IIA(Man) and His-15 (italics indicate HPr residues) of HPr, are in close proximity. An associative transition state involving a pentacoordinate phosphoryl group with trigonal bipyramidal geometry bonded to the N-epsilon2 atom of His-10 and the N-delta1 atom of His-15 can be readily formed with negligible displacement in the backbone coordinates of the residues immediately adjacent to the active site histidines. Comparing the structures of complexes of HPr with three other structurally unrelated phosphotransferase system proteins, enzymes I, IIA(glucose), and IIA(mannitol), reveals a number of common features that provide a molecular basis for understanding how HPr specifically recognizes a wide range of diverse proteins.

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Primary Citation of related structures