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LACTB

Function

Mitochondrial serine protease that acts as a regulator of mitochondrial lipid metabolism (PubMed:28329758). Acts by decreasing protein levels of PISD, a mitochondrial enzyme that converts phosphatidylserine (PtdSer) to phosphatidylethanolamine (PtdEtn), thereby affecting mitochondrial lipid metabolism (PubMed:28329758). It is unclear whether it acts directly by mediating proteolysis of PISD or by mediating proteolysis of another lipid metabolism protein (PubMed:28329758). Acts as a tumor suppressor that has the ability to inhibit proliferation of multiple types of breast cancer cells: probably by promoting decreased levels of PISD, thereby affecting mitochondrial lipid metabolism (PubMed:28329758).

Sequence similarities

Belongs to the peptidase S12 family.

Tissue specificity

Expressed predominantly in skeletal muscle.

Cellular localization

  • Mitochondrion

Alternative names

  • UNQ843/PRO1781
  • MRPL56
  • LACTB

Target type

Proteins

Molecular weight

60694Da