Ligamse

Ligamse is a term that can refer to ligases, enzymes that catalyze ligation reactions—the joining of two molecules via formation of a bond, typically a phosphodiester bond in DNA or RNA. The term is sometimes encountered as a variant spelling or misnomer for ligase in historical or niche texts.

In molecular biology, ligases function to seal nicks in the sugar-phosphate backbone of DNA after replication or repair, using cofactors such as ATP (in many bacterially derived ligases and some eukaryotic ones) or NAD+ (in certain bacterial ligases).

Human DNA ligases I, III, and IV are examples of eukaryotic enzymes participating in replication and repair; bacterial DNA ligases include NAD+-dependent enzymes. The general mechanism involves generation of an enzyme-adenylate intermediate, transfer of an adenylate group to the DNA end, and subsequent formation of a phosphodiester bond with release of AMP.

Applications of ligases include essential roles in molecular cloning and DNA assembly, where ligation joins DNA fragments into vectors or fused constructs. Thermostable variants enable ligation at elevated temperatures, improving specificity in some protocols. Ligation-based methods underpin many genetic engineering workflows, genome editing preparations, and DNA repair studies in cells.

Despite occasional usage, ligamse is not a widely recognized term in contemporary biochemistry, and most literature uses ligase to describe the enzymes in question. See also ligase.