May play a role in fatty acid biosynthesis. Binds 1 Mg(2+) ion per subunit. Homotrimer. Belongs to the HpcH/HpaI aldolase family. Citrate lyase beta subunit-like subfamily. This organism lacks the other subunits that are necessary for ATP-independent citrate lyase activity. Even though this protein has clear similarity to citrate lyase beta subunit, it is expected to have a somewhat different enzyme activity.