IUBMB Enzyme Nomenclature


Accepted name: phosphatidyl-myo-inositol α-mannosyltransferase

Reaction: GDP-α-D-mannose + 1-phosphatidyl-1D-myo-inositol = GDP + 2-O-(α-D-mannosyl)-1-phosphatidyl-1D-myo-inositol

Glossary: 1-phosphatidyl-1D-myo-inositol = PtdIns

Other name(s): mannosyltransferase PimA; PimA; guanosine diphosphomannose-phosphatidyl-inositol α-mannosyltransferase (ambiguous)

Systematic name: GDP-α-D-mannose:1-phosphatidyl-1D-myo-inositol 2-α-D-mannosyltransferase (configuration-retaining)

Comments: Requires Mg2+. The enzyme, found in Corynebacteriales, is involved in the biosynthesis of phosphatidyl-myo-inositol mannosides (PIMs).

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number:


1. Kordulakova, J., Gilleron, M., Mikusova, K., Puzo, G., Brennan, P.J., Gicquel, B. and Jackson, M. Definition of the first mannosylation step in phosphatidylinositol mannoside synthesis. PimA is essential for growth of mycobacteria. J. Biol. Chem. 277 (2002) 31335-31344. [PMID: 12068013]

2. Gu, X., Chen, M., Wang, Q., Zhang, M., Wang, B. and Wang, H. Expression and purification of a functionally active recombinant GDP-mannosyltransferase (PimA) from Mycobacterium tuberculosis H37Rv. Protein Expr. Purif. 42 (2005) 47-53. [PMID: 15939292]

3. Giganti, D., Albesa-Jove, D., Urresti, S., Rodrigo-Unzueta, A., Martinez, M.A., Comino, N., Barilone, N., Bellinzoni, M., Chenal, A., Guerin, M.E. and Alzari, P.M. Secondary structure reshuffling modulates glycosyltransferase function at the membrane. Nat. Chem. Biol. 11 (2015) 16-18. [PMID: 25402770]

4. Rodrigo-Unzueta, A., Martinez, M.A., Comino, N., Alzari, P.M., Chenal, A. and Guerin, M.E. Molecular basis of membrane association by the phosphatidylinositol mannosyltransferase PimA enzyme from Mycobacteria. J. Biol. Chem. 291 (2016) 13955-13963. [PMID: 27189944]

[EC created 2017]

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