Abstract
The Sugar Will Eventually be Exported Transporter (SWEET) family is a new class of transporters that plays crucial roles in the cellular sugar transport process. Their bacterial homologs, known as SemiSWEETs, are among the smallest transporters and can be used as a prototype for studying the biological properties of sugar transporters. Here, a set of dipolar-based multidimensional solid-state NMR spectra were employed to investigate the structure of Vibrio sp. SemiSWEET (Vs-SemiSWEET) reconstituted in the native-like lipid bilayers. A nearly complete (88% of the amino acid residues) backbone and side-chain 13C and 15N chemical shift assignments of Vs-SemiSWEET were obtained. The overall secondary structure of Vs-SemiSWEET predicted from the obtained 13C and 15N chemical shifts is similar to that from X-ray crystallography, with some differences, reflecting the influence of the membrane environments to the structure of membrane proteins.
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