Periplasmic loop P2 of the malf subunit of the maltose ATP binding cassette transporter is sufficient to bind the maltose binding protein malE

Tomas Jacso, Mathias Grote, Martin L. Daus, Peter Schmieder, Sandro Keller, Erwin Schneider, Bernd Reif

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

The Escherichia coli maltose transporter belongs to the ATP binding cassette (ABC) transporter superfamily. Recently, the crystal structure of the full transporter MalFGK2 in complex with the maltose binding protein (MBP) was determined [Oldham, M. L., et al. (2007) Crystal structure of a catalytic intermediate of the maltose transporter. Nature 450, 515-522]. Using liquid-state NMR, we find that the periplasmic loop P2 of MalF (MalF-P2) folds independently in solution and adopts a well-defined tertiary structure which is similar to the one found in the crystal. MalF-P2 interacts with the maltose binding protein, independent of the transmembrane region of MalF and MalG with an affinity of ∼ 10-20 μM, in the presence and absence of substrate. Analysis of residual dipolar coupling (RDC) experiments shows that the conformation of the two individual domains of MalF-P2 is preserved in the absence of MalE and resembles the conformation in the X-ray structure. Upon titration of MalE to MalF-P2, the two domains of MalF-P2 change their relative orientation to accommodate the ligand. In particular, a conformational change of domain 2 of MalF-P2 is induced, which is distinct from the conformation found in the X-ray structure.

Original languageEnglish
Pages (from-to)2216-2225
Number of pages10
JournalBiochemistry
Volume48
Issue number10
DOIs
StatePublished - 17 Mar 2009
Externally publishedYes

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