Plasma and cytosolic proteins

The term Plasma and cytosolic proteins refers to a vast and heterogeneous collection of proteins found in the blood plasma and the intracellular cytoplasm, rather than a single, specific therapeutic target. Plasma proteins, such as albumin and various globulins, are vital for maintaining blood volume, transporting hormones and drugs, and facilitating immune defense (Anderson & Anderson, 2002, Molecular & Cellular Proteomics). Cytosolic proteins include a diverse array of enzymes, scaffolding proteins, and signaling molecules that drive cellular metabolism and respond to external stimuli (Luby-Phelps, 2000, International Review of Cytology). Because this category encompasses thousands of unique gene products, it is considered an incorrect or overly broad designation for a drug target. In drug discovery, researchers focus on specific individual proteins within these compartments, such as specific kinases in the cytosol or clotting factors in the plasma, to achieve therapeutic effects. Many drugs interact non-specifically with plasma proteins like albumin, which significantly affects their pharmacokinetics and bioavailability (StatPearls, 2023, Biochemistry, Plasma Protein). Furthermore, the distribution of a drug between the plasma and the cytosol is a key determinant of its therapeutic index and potential for off-target effects. Consequently, while these compartments are essential for pharmacology, they do not represent a discrete molecular target for drug development.

Other names

Plasma proteinsCytosolic proteinsCytoplasmic proteinsSoluble proteome

Not applicable; this is a broad biological category rather than a specific molecular target. Drugs interact with specific individual proteins within these compartments.