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In biochemistry, a ligase is an enzyme that can catalyze the joining of two large molecules by forming a new chemical bond, usually with accompanying hydrolysis of a small pendant chemical group on one of the larger molecules or the enzyme catalyzing the linking together of two compounds, e.g., enzymes that catalyze joining of C-O, C-S, C-N, etc. In general, a ligase catalyzes the following reaction:

Ab + C → A–C + b

or sometimes

Ab + cD → A–D + b + c + d + e + f

where the lowercase letters can signify the small, dependent groups. Ligase can join two complementary fragments of nucleic acid and repair single stranded breaks that arise in double stranded DNA during replication.

Nomenclature

The common names of ligases often include the word "ligase", such as DNA ligase, an enzyme commonly used in molecular biology laboratories to join together DNA fragments. Other common names for ligases include the word "synthetase", because they are used to synthesize new molecules.

Biochemical nomenclature has sometimes distinguished synthetases from synthases and sometimes treated the words as [[synonym). Under one definition, synthases do not use energy from nucleoside triphosphates (such as ATP, GTP, CTP, TTP, and UTP), whereas synthetases do use nucleoside triphosphates. It is also said that a synthase is a lyase (a lyase is an enzyme that catalyzes the breaking of various chemical bonds by means other than hydrolysis and oxidation, often forming a new double bond or a new ring structure) and does not require any energy, whereas a synthetase is a ligase (a ligase is an enzyme that binds two chemicals or compounds) and thus requires energy. However, the Joint Commission on Biochemical Nomenclature (JCBN) dictates that "synthase" can be used with any enzyme that catalyses synthesis (whether or not it uses nucleoside triphosphates), whereas "synthetase" is to be used synonymously.^[1]

Classification

Ligases are classified as EC 6 in the EC number classification of enzymes. Ligases can be further classified into six subclasses:

• 
  EC 6.1 includes ligases used to form carbon-oxygen bonds


• 
  EC 6.2 includes ligases used to form carbon-sulfur bonds


• 
  EC 6.3 includes ligases used to form carbon-nitrogen bonds (including argininosuccinate synthetase)


• 
  EC 6.4 includes ligases used to form carbon-carbon bonds


• 
  EC 6.5 includes ligases used to form phosphoric ester bonds


• 
  EC 6.6 includes ligases used to form nitrogen-metal bonds, as in the chelatases
  

Membrane-associated ligases

Some ligases associate with biological membranes as peripheral membrane proteins or anchored through a single transmembrane helix^[2], for example certain ubiquitin ligase related proteins.

Etymology and pronunciation

The word ligase uses combining forms of lig- (from the Latin verb ligāre, "to bind" or "to tie together") + -ase (denoting an enzyme), yielding "binding enzyme".

See also

• DNA ligase

References

• 
  EC 6 Introduction from the Department of Chemistry at Queen Mary, University of London