Välittäjäproteiini

Välittäjäproteiini, also known as mediator protein or adapter protein, is a protein that serves as a bridge or link between other molecules within a cell. These proteins do not typically have enzymatic activity themselves but are crucial for facilitating interactions and assembling molecular complexes. They often contain multiple binding domains, allowing them to simultaneously interact with different proteins, nucleic acids, or lipids.

The primary function of välittäjäproteiini is to organize and regulate cellular processes by bringing together the necessary components. For example, they play a critical role in signal transduction pathways, where they can link receptor proteins to downstream signaling molecules, ensuring that signals are transmitted efficiently and accurately. They are also involved in the assembly of larger protein complexes, such as those found in the spliceosome or proteasome, contributing to their stability and function.

In essence, välittäjäproteiinit act as scaffolds or hubs, organizing cellular machinery and coordinating complex biological events. Their ability to mediate interactions is fundamental to a wide range of cellular functions, including gene expression, DNA repair, protein degradation, and immune responses. The specific välittäjäproteiinit present in a cell and their binding partners determine the intricate network of molecular interactions that govern cellular life.