New Delhi metallo-Beta-lactamase enz]rrne confers resistance to which antibiotic?
**Core Concept**
The New Delhi metallo-Beta-lactamase (NDM) enzyme is a type of carbapenemase, a class of enzymes that confer resistance to beta-lactam antibiotics by hydrolyzing the beta-lactam ring. This enzyme is particularly concerning as it can inactivate a wide range of beta-lactam antibiotics, including carbapenems, which are considered last-resort antibiotics.
**Why the Correct Answer is Right**
The NDM enzyme works by binding to the metal ions (zinc or cobalt) in the enzyme's active site, which is essential for its catalytic activity. This enzyme then uses these metal ions to hydrolyze the beta-lactam ring of antibiotics, rendering them ineffective. The NDM enzyme is particularly effective against carbapenems, such as ertapenem, meropenem, and imipenem, which are often used to treat infections caused by multidrug-resistant bacteria.
**Why Each Wrong Option is Incorrect**
* **Option A:** While the NDM enzyme does confer resistance to penicillins, it is not the primary antibiotic class that it targets. This option is incorrect because it does not accurately reflect the enzyme's primary mechanism of resistance.
* **Option B:** The NDM enzyme does not confer resistance to aminoglycosides, which are a class of antibiotics that work by inhibiting protein synthesis. This option is incorrect because it is a different class of antibiotics altogether.
* **Option C:** While the NDM enzyme does confer resistance to cephalosporins, it is not the primary antibiotic class that it targets. This option is incorrect because it does not accurately reflect the enzyme's primary mechanism of resistance.
**Clinical Pearl / High-Yield Fact**
The NDM enzyme is a classic example of a carbapenemase that has emerged as a major public health concern due to its ability to confer resistance to last-resort antibiotics. It is essential for clinicians to be aware of this enzyme and to implement appropriate infection control measures to prevent the spread of NDM-producing bacteria.
**Correct Answer: C. Carbapenems.**