Borrelia burgdorferi is a spirochete bacterium responsible for Lyme disease, a tick-borne illness that affects humans and animals. The bacterium is transmitted through the bite of infected Ixodes ticks. Among the various proteins expressed by Borrelia burgdorferi, the p100 protein, also known as p83, is of particular interest due to its role in the immune response and its potential use in diagnostic assays.
The p100 protein is a high-molecular-weight protein that is expressed on the surface of Borrelia burgdorferi. It is one of the immunodominant antigens, meaning it elicits a strong immune response in infected individuals. The protein has a calculated molecular mass of approximately 77,813 Daltons and is glycosylated, which means it has sugar molecules attached to it .
Recombinant p100 protein is produced using genetic engineering techniques. The gene encoding the p100 protein is cloned into an expression vector, which is then introduced into a host cell, such as the SF9 insect cell line. The host cells produce the p100 protein, which is then purified using chromatographic techniques. The recombinant p100 protein is often tagged with a His-tag at the N-terminus to facilitate purification .
The p100 protein is used in serological assays to diagnose Lyme disease. Serological assays detect antibodies produced by the immune system in response to infection. The p100 protein is included in enzyme-linked immunosorbent assays (ELISAs) and immunoblots as an antigen to capture antibodies from patient samples. The presence of antibodies against p100 in a patient’s serum indicates exposure to Borrelia burgdorferi .