Figure 3. Comparison of PagP and serum retinol-binding protein.

Figure 3

Comparison of PagP and serum retinol-binding protein. PagP (A) is shown in green (Protein Data Bank code 1THQ), and RBP (B) is shown in red (Protein Data Bank code 1AQB). The lauroyldimethylamine-N-oxide and retinol ligands are represented as spheres using CPK colors. PagP has an N-terminal α-helix, while most lipocalin structures, including RBP, have a single α-helix at the C-terminus. Both proteins are oriented so the β-strands correspond to each other; note that the first two β-strands of PagP are separated by the disordered L1 surface loop.

From: Bacterial Lipocalins: Origin, Structure, and Function

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