Which of the following has the ability to bind antibodies ? 1) coagulase

2) streptokinase

3) protein A

4) Hydrogen peroxide

The protein A has the ability to bind antibodies (Option 3).

Protein A is a surface protein which acts as a bacterial defense mechanism against the host immune system. This protein (protein A) was originally discovered within the cell wall of Staphylococcus aureus.

Protein A binds the fragment crystallizable region (Fc region) of immunoglobulin G (IgG) antibodies.Streptokinase is a enzyme produced by Streptococci spp. in order to break up blood clots and thus spreads from the original site of infection.Coagulase is another bacterial enzyme that clots blood plasma by converting fibrinogen in plasma to fibrin.Hydrogen peroxide is an oxidizing agent which is used as an antimicrobial agent.

In conclusion, protein A has the ability to bind antibodies (IgG antibodies).

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