MalF is a component of the maltose uptake system found in Proteobacteria, an ATP-binding cassette (ABC) transporter. This protein is composed of eight transmembrane (TM) helices and folds in a way its concave surface faces the similar assembly of MalG to enclose the maltose. This entry represents the first TM helices of this structure, which are located N-terminal to the large periplasmic loop (P2, Pfam:PF14785) [1].

1: Crystal structure of a catalytic intermediate of the maltose transporter. Oldham ML, Khare D, Quiocho FA, Davidson AL, Chen J; Nature. 2007;450:515-521. PMID:18033289

2: Alternating access in maltose transporter mediated by rigid-body rotations. Khare D, Oldham ML, Orelle C, Davidson AL, Chen J; Mol Cell. 2009;33:528-536. PMID:19250913

3: Structural basis for substrate specificity in the Escherichia coli maltose transport system. Oldham ML, Chen S, Chen J; Proc Natl Acad Sci U S A. 2013;110:18132-18137. PMID:24145421