Publications

• Purification, identification, and cloning of lysoplasmalogenase, the enzyme that catalyzes hydrolysis of the vinyl ether bond of lysoplasmalogen.

  Wu L.C., Pfeiffer D.R., Calhoon E.A., Madiai F., Marcucci G., Liu S., Jurkowitz M.S.

  Lysoplasmalogenase (EC 3.3.2.2 and EC 3.3.2.5) is an enzyme that catalyzes hydrolytic cleavage of the vinyl ether bond of lysoplasmalogen, forming fatty aldehyde and glycerophosphoethanolamine or glycerophosphocholine and is specific for the sn-2-deacylated form of plasmalogen. Here we report the ... >> More

  Lysoplasmalogenase (EC 3.3.2.2 and EC 3.3.2.5) is an enzyme that catalyzes hydrolytic cleavage of the vinyl ether bond of lysoplasmalogen, forming fatty aldehyde and glycerophosphoethanolamine or glycerophosphocholine and is specific for the sn-2-deacylated form of plasmalogen. Here we report the purification, characterization, identification, and cloning of lysoplasmalogenase. Rat liver microsomal lysoplasmalogenase was solubilized with octyl glucoside and purified 500-fold to near homogeneity using four chromatography steps. The purified enzyme has apparent K(m) values of ∼50 μm for both lysoplasmenylcholine and lysoplasmenylethanolamine and apparent V(m) values of 24.5 and 17.5 μmol/min/mg protein for the two substrates, respectively. The pH optimum was 7.0. Lysoplasmalogenase was competitively inhibited by lysophosphatidic acid (K(i) ∼20 μm). The predominant band on a gel at ∼19 kDa was subjected to trypsinolysis, and the peptides were identified by mass spectrometry as Tmem86b, a protein of unknown function. Transient transfection of human embryonic kidney (HEK) 293T cells showed that TMEM86b cDNA yielded lysoplasmalogenase activity, and Western blot analyses confirmed the synthesis of TMEM86b protein. The protein was localized in the membrane fractions. The TMEM86b gene was also transformed into Escherichia coli, and its expression was verified by Western blot and activity analyses. Tmem86b is a hydrophobic transmembrane protein of the YhhN family. Northern blot analyses demonstrated that liver expressed the highest level of Tmem86b, which agreed with tissue distribution of activity. Overexpression of TMEM86b in HEK 293T cells resulted in decreased levels of plasmalogens, suggesting that the enzyme may be important in regulating plasmalogen levels in animal cells. << Less

  J. Biol. Chem. 286:24916-24930(2011) [PubMed] [EuropePMC]

  This publication is cited by 1 other entry.

• Liberation of free aldehyde from 1-(1-alkenyl)-sn-glycero-3-phosphoethanolamine (lysoplasmalogen) by rat liver microsomes.

  Gunawan J., Debuch H.

  We found an enzyme in the microsomal fraction of 21-day-old-rat liver, which liberates a free aldehyde from 1-(1-alkenyl)-sn-glycero-3-phosphoethanolamine (lysoplasmalogen) and which has an activity of about 42 mU/mg protein under the conditions described. Kinetic data are presented. The pH optimu ... >> More

  We found an enzyme in the microsomal fraction of 21-day-old-rat liver, which liberates a free aldehyde from 1-(1-alkenyl)-sn-glycero-3-phosphoethanolamine (lysoplasmalogen) and which has an activity of about 42 mU/mg protein under the conditions described. Kinetic data are presented. The pH optimum is found around pH 7.1. SH-blocking reagents, as well as deoxycholate, act as strong inhibitors, while Mg2 and Ca2 also inhibit the reaction to some extent. The enzymic activity is specific with respect to the monoradylphospholipid, since the acylated compound 2-acyl-1-(1-alkenyl)-sn-glycero-3-phosphoethanolamine does not serve as substrate. The ether linkage of 1-alkyl-sn-glycero-3-phosphoethanolamine is not hydrolyzed either under these conditions. A similar enzyme activity in liver has only been described for choline-containing lysoplasmalogen. << Less

  Hoppe Seylers Z Physiol Chem 362:445-452(1981) [PubMed] [EuropePMC]