1vrc

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Complex of enzyme IIAmannose and the histidine-containing phosphocarrier protein HPr from escherichia coli nmr, restrained regularized mean structure

Structural highlights

1vrc is a 4 chain structure with sequence from Escherichia coli. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Ligands:PO3
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

PTNAB_ECOLI The phosphoenolpyruvate-dependent sugar phosphotransferase system (sugar PTS), a major carbohydrate active -transport system, catalyzes the phosphorylation of incoming sugar substrates concomitantly with their translocation across the cell membrane. This system is involved in mannose transport.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

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.

Solution NMR structure of the 48-kDa IIAMannose-HPr complex of the Escherichia coli mannose phosphotransferase system.,Williams DC Jr, Cai M, Suh JY, Peterkofsky A, Clore GM J Biol Chem. 2005 May 27;280(21):20775-84. Epub 2005 Mar 23. PMID:15788390[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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See Also

References

  1. Williams DC Jr, Cai M, Suh JY, Peterkofsky A, Clore GM. Solution NMR structure of the 48-kDa IIAMannose-HPr complex of the Escherichia coli mannose phosphotransferase system. J Biol Chem. 2005 May 27;280(21):20775-84. Epub 2005 Mar 23. PMID:15788390 doi:10.1074/jbc.M501986200

Contents


PDB ID 1vrc

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