3EQV CRYSTAL STRUCTURE OF PENICILLIN-BINDING PROTEIN 2 FROM NEISSERIA GONORRHOEAE CONTAINING FOUR MUTATIONS ASSOCIATED WITH PENICILLIN RESISTANCE BIOSYNTHETIC PROTEIN, PENICILLIN-BINDING PROTEIN, CLASS B TRANSPEPTIDASE, PENICILLIN RESISTANCE, CELL DIVISION, CELL INNER MEMBRANE, CELL MEMBRANE, CELL SHAPE, CELL WALL BIOGENESIS/DEGRADATION, PEPTIDOGLYCAN SYNTHESIS