In vivo new proteins are folded in highly specific three-dimensional shapes with the help of Chaperones. That conformation, known as tertiary structure, makes it capable of performing its biological function. (Many enzymes and other non-structural proteins have more than one native state, and they operate or undergo regulation by transitioning between these states. However,) "native state" is used almost exclusively in the singular, typically to distinguish properly folded proteins from denatured or unfolded ones.
It is crucial for the functional analysis of proteins to use native ones, as we provide in a variety of over 2,000 products in our shop such as MMP2, Albumin, Protein A and many others to get a deeper understanding of proteomics. If you need help, please contact our customer support via phone, live chat or email.