Recombinant Pseudomonas stutzeri Membrane Protein nosY (UniProt ID: P19845) is a full-length integral membrane protein (1-276 amino acids) encoded by the nosY gene. It functions as a permease component of an ATP-binding cassette (ABC) transporter system (nosDFY) critical for copper handling and nitrous oxide reductase (NOR) maturation in denitrifying bacteria . The recombinant form is typically expressed in E. coli or Pseudomonas stutzeri with an N-terminal His-tag for purification and structural studies .
nosY exhibits a hydrophobic transmembrane domain structure typical of ABC transporter permeases. Its amino acid sequence (MW ~30 kDa) includes motifs for membrane integration and ATP-independent substrate translocation .
nosY operates as part of the nosDFY complex, which lacks canonical ATPase subunits but uses ATP hydrolysis to facilitate copper transfer from the chaperone NosL to nitrous oxide reductase (NOR) . Structural cryo-EM studies reveal that nosY stabilizes the periplasmic domain of NosD, enabling conformational changes critical for copper delivery .