# pathway asparagine step glnP # Singleton 1 TCDB::Q9CES5 3.A.1.3.25 Lactococcus lactis subsp. lactis (strain IL1403) heteromeric Singleton1 Glutamine ABC transporter permease and substrate binding protein protein, component of Glutamine transporter, GlnQP. Takes up glutamine, asparagine and glutamate which compete for each other for binding both substrate and the transmembrane protein constituent of the system (Fulyani et al. 2015). Tandem substrate binding domains (SBDs) differ in substrate specificity and affinity, allowing cells to efficiently accumulate different amino acids via a single ABC transporter. Analysis revealed the roles of individual residues in determining the substrate affinity curated:TCDB::Q9CES5