Final answer:
Neurotoxins target the nervous system, hepatotoxins target the liver, and renal toxins target the kidneys. The new toxin fits the profile of a hepatotoxin and likely functions as an A-B exotoxin due to its protein structure and specificity for liver cells.
Step-by-step explanation:
Neurotoxins are biotoxins that specifically target the nervous system. An example of a neurotoxin is tetanus toxin, which affects inhibitory interneurons and can lead to permanent muscle contraction and severe complications. Hepatotoxins, on the other hand, affect liver cells, and an example of this would be a toxin produced by a gram-negative bacterium targeting liver cells, making it a hepatotoxin. Renal toxins, such as those caused by Shiga toxin from S. dysenteriae, specifically target the kidneys and can result in conditions like hemolytic uremic syndrome (HUS).
Based on the fact that the new toxin you've identified targets liver cells, is composed mostly of protein, and is not heat stable, it can be classified as a hepatotoxin. Additionally, due to its proteinaceous nature and cellular specificity, it likely functions as an A-B exotoxin with an A component for activity within the cell and a B component for binding to the cells.