periplasmic component (FmdD) of an active transport system for short-chain amides and urea (FmdDEF)
This group includes the periplasmic component (FmdD) of an active transport system for short-chain amides and urea (FmdDEF), found in Methylophilus methylotrophus, and its homologs from other bacteria. FmdD, a type 1 periplasmic binding protein, is induced by short-chain amides and urea and repressed by excess ammonia, while FmdE and FmdF are hydrophobic transmembrane proteins. FmdDEF is predicted to be an ATP-dependent transporter and closely resembles the periplasmic binding protein and the two transmembrane proteins present in various hydrophobic amino acid-binding transport systems.
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