PENICILLIN-BINDING PROTEIN, PENICILLIN-BINDING PROTEINS, PSEUDOMONAS AERUGINOSA, STRUCTURAL GENOMICS, OXFORD PROTEIN PRODUCTION FACILITY, OPPF, TRANSPEPTIDASE, CELL WALL BIOSYNTHESIS, OUT PERIPLASMIC MEMBRANE CRYSTAL STRUCTURE OF PENICILLIN-BINDING PROTEIN 3 FROM PSEUDOMONAS AERUGINOSA 3OC2