Cofactor
Cofactor — A non-protein chemical compound required for enzyme activity, such as the copper ion in the GHK-Cu peptide complex that is essential for its biological function.
What Is a Cofactor?
A cofactor is a non-protein molecule required for enzyme activity. Metal ion cofactors (Zn²⁺, Cu²⁺, Fe²⁺) are essential for metalloprotease function, and organic cofactors (NAD⁺, FAD) participate in redox enzymes. In peptide research, cofactor requirements affect assay design: zinc must be present for metalloprotease activity assays, and GHK-Cu requires copper as a cofactor for its biological activity.
Peptide-Relevant Cofactors
- Zinc: Required by ACE, neprilysin, and metalloproteases that degrade peptides
- Copper: Cofactor for GHK-Cu biological activity and PAM (peptidyl-amidating enzyme)
- Calcium: Required for calmodulin activation and some protease activities
Frequently Asked Questions
What is Cofactor?
A non-protein chemical compound required for enzyme activity, such as the copper ion in the GHK-Cu peptide complex that is essential for its biological function.
Why is Cofactor important in peptide research?
Cofactor is a fundamental concept in biochemistry as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.