Protein
Archaetidylserine synthase
Organism
Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H)
Function
Involved in the lipid biosynthesis. Catalyzes the formation of unsaturated archaetidylserine from CDP-unsaturated archaeol and L-serine. Activity with ester-linked substrate analogs containing straight aliphatic chains (typical bacterial substrates) is two to three times higher than that with the corresponding ether-type substrate (typical archaeal substrates). Both enantiomers of CDP-unsaturated archaeols with ether-linked geranylgeranyl chains and CDP-saturated archaeol with ether-linked phytanyl chains are similarly active. The enzyme also accepts D-serine, although activity is only about third of that with L-serine.
Similarity
Belongs to the CDP-alcohol phosphatidyltransferase class-I family.
Sequence
MMNDKKITSFIALPDLLSMLNASSGYLSILLSIDGSLNAACILMLLAVLFDSLDGWVARKTGRIDIHGFGKNMDSLSDVISFGVAPAILIYSAAVDFRYINILVGPLIVLCGILRLSRFNVLTGGGKNFTGLPIPVAAVTISSFYLTGFYSELSAAFIMIAVSVLMISSIEYPRVDGMGASTALILIIATIISVAAVEILQAASVVAGPVAIILFIATLTYIAVPILPKRDVI