Conserved Site

ATP-citrate lyase/succinyl-CoA ligase, conserved site (IPR033847)

Short name: Citrt_syn/SCS-alpha_CS


There are four different enzymes that share a similar catalytic mechanism which involves the phosphorylation by ATP (or GTP) of a specific histidine residue in the active site. These enzymes are

  • ATP citrate-lyase (EC: [PMID: 1371749], the primary enzyme responsible for the synthesis of cytosolic acetyl-CoA in many tissues, catalyzes the formation of acetyl-CoA and oxaloacetate from citrate and CoA with the concomitant hydrolysis of ATP to ADP and phosphate. ATP-citrate lyase is a tetramer of identical subunits.
  • Succinyl-CoA ligase (GDP-forming) (EC: [PMID: 8401211] is a mitochondrial enzyme that catalyzes the substrate level phosphorylation step of the tricarboxylic acid cycle: the formation of succinyl-CoA from succinate with a concomitant hydrolysis of GTP to GDP and phosphate. This enzyme is a dimer composed of an alpha and a beta subunits.
  • Succinyl-CoA ligase (ADP-forming) (EC: [PMID: 3002435] is a bacterial enzyme that during aerobic metabolism functions in the citric acid cycle, coupling the hydrolysis of succinyl-CoA to the synthesis of ATP. It can also function in the other direction for anabolic purposes. This enzyme is a tetramer composed of two alpha and two beta subunits.
  • Malate-CoA ligase (EC: (malyl-CoA synthetase) [PMID: 7961516], is a bacterial enzyme that forms malyl-CoA from malate and CoA with the concomitant hydrolysis of ATP to ADP and phosphate. Malate-CoA ligase is composed of two different subunits.

This entry corresponds to a glycine-rich conserved region, located in the second half of ATP citrate lyase and in the alpha subunits of succinyl-CoA ligases and malate-CoA ligase.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.
PROSITE patterns