LMPD Database

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LMP009673

UniProt Annotations

Entry Information
Gene NameMPBQ/MSBQ methyltransferase
Protein EntryBQMT_ARATH
UniProt IDQ9LY74
SpeciesArabidopsis
Comments
Comment typeDescription
Catalytic ActivityS-adenosyl-L-methionine + 2-methyl-6- phytylbenzene-1,4-diol = S-adenosyl-L-homocysteine + 2,3-dimethyl- 6-phytylbenzene-1,4-diol. {ECO:0000269|PubMed:14508009}.
Catalytic ActivityS-adenosyl-L-methionine + 2-methyl-6-all- trans-nonaprenylbenzene-1,4-diol = S-adenosyl-L-homocysteine + plastoquinol. {ECO:0000269|PubMed:14508009}.
Catalytic ActivityS-adenosyl-L-methionine + 6-geranylgeranyl-2- methylbenzene-1,4-diol = S-adenosyl-L-homocysteine + 6- geranylgeranyl-2,3-dimethylbenzene-1,4-diol. {ECO:0000269|PubMed:14508009}.
Disruption PhenotypePale green seedlings that are lethal when grown on normal conditions. {ECO:0000269|PubMed:14508009}.
FunctionInvolved in a key methylation step in both tocopherols (vitamin E) and plastoquinone synthesis. Catalyzes the conversion of 2-methyl-6-phytyl-1,4-hydroquinone (MPBQ) to 2,3-dimethyl-6- phytyl-1,4-hydroquinone (DMPQ, a substrate for tocopherol cyclase), and 2-methyl-6-solanyl-1,4-benzoquinone (MSBQ) to plastoquinone. {ECO:0000269|PubMed:14508009}.
PathwayCofactor biosynthesis; tocopherol biosynthesis.
SimilarityBelongs to the class I-like SAM-binding methyltransferase superfamily. MPBQ/MBSQ MT family. {ECO:0000255|PROSITE-ProRule:PRU01069}.
Subcellular LocationPlastid, chloroplast inner membrane {ECO:0000269|PubMed:20194502}; Single-pass membrane protein {ECO:0000269|PubMed:20194502}. Note=The transmembrane domain is sufficient to direct stop-transfer insertion and topology in the inner envelope membrane. {ECO:0000269|PubMed:20194502}.