Multiple choice

The Act protein secreted by Listeria monocytogenes when it invades a eukaryotic cell

  1. attaches to microtubules, allowing the bacterium to move along the fibres

  2. degrades the cytoskeleton, allowing the bacterium to travel through the plasma membrane to adjacent cells

  3. depolymerises microfilaments, allowing the bacterium to move more easily in the cytoplasm

  4. polymerises actin filaments, causing the bacterium to move through the cytoplasm
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Polymerises actin filaments, causing the bacterium to move through the cytoplasm. L. monocytogenes invades the cells by polymerising actin filaments in the cytoplasm, because ActA protein is a protease enzyme and specific for actin proteins for its degradation.

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