Carbaminohemoglobin interacts with carbon dioxide in a process known as respiratory gas exchange. The interaction involves the binding of carbon dioxide to hemoglobin. Carbon dioxide binds to the protein chains of hemoglobin. The ability of hemoglobin to bind to both oxygen and carbon dioxide molecules is what makes it an important protein to the respiratory system in respiratory gas exchange.
The interactions between carbon dioxide and hemoglobin helps in the transport of carbon dioxide from the tissues to the lungs for eliminations. When carbon dioxide is transported from the tissues, it is produced as a waste product of a set of reactions known as cellular metabolism. Most importantly, the binding of carbon dioxide to hemoglobin plays a part in the buffering of blood pH by preventing the drop of pH due to the production of carbonic acid.
Although, the carbaminohemoglobin protein interacts with another protein (like hemoglobin) found in red blood cells, this interaction only takes place in the bloodstream and its products can be expelled. Carbaminohemoglobin does not interact with DNA since DNA is a molecule that is found in cell nucleus and its function is to carry genetic information.