In Monday’s discussion of the citric acid cycle, I was particularly interested in the role of the lipoamide “swinging arm” in the pyruvate dehydrogenase complex. I am currently taking a public health course where we recently examined the devastating effects of environmental contaminants such as arsenic and lead, from the Flint, Michigan water crisis to arsenic exposure through private well water in Maine. Learning about the biochemical explanations behind these public health issues was especially engaging.
The lipoamide arm contains sulfhydryl (-SH) groups that are essential for transferring acetyl groups to coenzyme A. When arsenite binds to these -SH groups, it locks the lipoamide in an inactive form, halting the enzyme’s catalytic cycle and blocking the production of acetyl-CoA. This disruption impairs cellular respiration and helps explain the severe metabolic consequences observed in arsenic poisoning.
I am excited to bring this biochemical understanding into my public health class discussions and to find ways to connect it with my thesis research on PFAS contamination in Maine. Examining how environmental toxins disrupt molecular pathways has deepened my appreciation for the connection between biochemistry and environmental health and strengthened my motivation to understand these mechanisms as a foundation for addressing contamination and its impact on human health.
This is a really interesting connection to public health, and shows that there are in fact many overlaps between the biochemistry and environmental science fields. In class we most often are reading case studies related to diet, so this is a good example of how water quality is tied to public health and now we know that connection on the molecular level. I’m interested to hear more about this if you see a connection to your PFAS thesis.
This is a super interesting perspective to view what we have learned. While most of the material we cover is super “zoomed in” on the molecular and biological effects, I think it is also important to look at why some of these outcomes occur on a larger scale. Being able to look at a current event or public health issue and know the science behind what is happening is, at least to me, gratifying. It not only tells us that we are understanding the biochemistry behind what we are learning but also suggests real-world problems and solutions.