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Jiang, Daohua; Zhao, Yan; Wang, Xianping; Fan, Junping; Heng, Jie; Liu, Xuehui; Feng, Wei; Kang, Xusheng; Huang, Bo; Liu, Jianfeng; Zhang, Xuejun Cai
Proceedings of the National Academy of Sciences - PNAS, 09/2013, Volume: 110, Issue: 36Journal Article
The major facilitator superfamily (MFS) is the largest family of secondary active transporters and is present in all life kingdoms. Detailed structural basis of the substrate transport and energycoupling mechanisms of these proteins remain to be elucidated. YajR is a putative proton-driven MFS transporter found in many Gram-negative bacteria. Here we report the crystal structure of Escherichia coli YajR at 3.15 Å resolution in an outward-facing conformation. In addition to having the 12 canonical transmembrane helices, the YajR structure includes a unique 65-residue C-terminal domain which is independently stable. The structure is unique in illustrating the functional role of "sequence motif A." This highly conserved element is seen to stabilize the outward conformation of YajR and suggests a general mechanism for the conformational change between the inward and outward states of the MFS transporters.
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