Enzymes Breaking Down Antibiotics (image) University of Bristol Share Print E-Mail Caption A carbapenem molecule, a last resort antibiotic, enters the carbapenemase enzyme (blue arrow), where the crucial beta-lactam structure gets broken down. The ineffective molecule then leaves (orange arrow). Credit University of Bristol Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.