3LNN

Crystal structure of ZneB from Cupriavidus metallidurans

Summary for 3LNN

• Entry DOI: 10.2210/pdb3lnn/pdb
• Descriptor: Membrane fusion protein (MFP) heavy metal cation efflux ZneB (CzcB-like), ZINC ION (3 entities in total)
• Functional Keywords: membrane fusion protein, structural genomics, psi-2, protein structure initiative, center for structures of membrane proteins, csmp, membrane protein, metal transport
• Biological source: Cupriavidus metallidurans
• Total number of polymer chains: 2
• Total formula weight: 77657.30

Authors

Lee, J.K.,De Angelis, F.,Miercke, L.J.,Stroud, R.M.,Vandenbussche, G.,Center for Structures of Membrane Proteins (CSMP) (deposition date: 2010-02-02, release date: 2010-06-30, Last modification date: 2024-02-21)

Primary citation

De Angelis, F.,Lee, J.K.,O'Connell, J.D.,Miercke, L.J.,Verschueren, K.H.,Srinivasan, V.,Bauvois, C.,Govaerts, C.,Robbins, R.A.,Ruysschaert, J.M.,Stroud, R.M.,Vandenbussche, G.
Metal-induced conformational changes in ZneB suggest an active role of membrane fusion proteins in efflux resistance systems.
Proc.Natl.Acad.Sci.USA, 107:11038-11043, 2010

PubMed Abstract: Resistance nodulation cell division (RND)-based efflux complexes mediate multidrug and heavy-metal resistance in many Gram-negative bacteria. Efflux of toxic compounds is driven by membrane proton/substrate antiporters (RND protein) in the plasma membrane, linked by a membrane fusion protein (MFP) to an outer-membrane protein. The three-component complex forms an efflux system that spans the entire cell envelope. The MFP is required for the assembly of this complex and is proposed to play an important active role in substrate efflux. To better understand the role of MFPs in RND-driven efflux systems, we chose ZneB, the MFP component of the ZneCAB heavy-metal efflux system from Cupriavidus metallidurans CH34. ZneB is shown to be highly specific for Zn(2+) alone. The crystal structure of ZneB to 2.8 A resolution defines the basis for metal ion binding in the coordination site at a flexible interface between the beta-barrel and membrane proximal domains. The conformational differences observed between the crystal structures of metal-bound and apo forms are monitored in solution by spectroscopy and chromatography. The structural rearrangements between the two states suggest an active role in substrate efflux through metal binding and release.

PubMed: 20534468
DOI: 10.1073/pnas.1003908107

Experimental method

X-RAY DIFFRACTION (2.796 Å)