The Enzyme Database

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EC 4.2.1.127     
Accepted name: linalool dehydratase
Reaction: (3S)-linalool = myrcene + H2O
For diagram of acyclic monoterpenoid biosynthesis, click here
Glossary: linalool = 3,7-dimethylocta-1,6-dien-3-ol
Other name(s): linalool hydro-lyase (myrcene-forming)
Systematic name: (3S)-linalool hydro-lyase (myrcene-forming)
Comments: In absence of oxygen the bifunctional linalool dehydratase-isomerase can catalyse in vitro two reactions, the hydration of myrcene to (3S)-linalool and the isomerization of (3S)-linalool to geraniol, the latter activity being classified as EC 5.4.4.4, geraniol isomerase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB
References:
1.  Brodkorb, D., Gottschall, M., Marmulla, R., Lüddeke, F. and Harder, J. Linalool dehydratase-isomerase, a bifunctional enzyme in the anaerobic degradation of monoterpenes. J. Biol. Chem. 285 (2010) 30436–30442. [DOI] [PMID: 20663876]
2.  Lüddeke, F. and Harder, J. Enantiospecific (S)-(+)-linalool formation from β-myrcene by linalool dehydratase-isomerase. Z. Naturforsch. C 66 (2011) 409–412. [PMID: 21950166]
[EC 4.2.1.127 created 2011, modified 2012]
 
 
EC 4.2.3.25     
Accepted name: S-linalool synthase
Reaction: geranyl diphosphate + H2O = (3S)-linalool + diphosphate
For diagram of acyclic monoterpenoid biosynthesis, click here
Glossary: (3S)-linalool = (3S)-3,7-dimethylocta-1,6-dien-3-ol
Other name(s): LIS; Lis; 3S-linalool synthase
Systematic name: geranyl-diphosphate diphosphate-lyase [(3S)-linalool-forming]
Comments: Requires Mn2+ or Mg2+ for activity. Neither (S)- nor (R)-linalyl diphosphate can act as substrate for the enzyme from the flower Clarkia breweri [1]. Unlike many other monoterpene synthases, only a single product, (3S)-linalool, is formed.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number: 160477-81-6
References:
1.  Pichersky, E., Lewinsohn, E. and Croteau, R. Purification and characterization of S-linalool synthase, an enzyme involved in the production of floral scent in Clarkia breweri. Arch. Biochem. Biophys. 316 (1995) 803–807. [DOI] [PMID: 7864636]
2.  Lücker, J., Bouwmeester, H.J., Schwab, W., Blaas, J., van der Plas, L.H. and Verhoeven, H.A. Expression of Clarkia S-linalool synthase in transgenic petunia plants results in the accumulation of S-linalyl-β-D-glucopyranoside. Plant J. 27 (2001) 315–324. [DOI] [PMID: 11532177]
3.  Dudareva, N., Cseke, L., Blanc, V.M. and Pichersky, E. Evolution of floral scent in Clarkia: novel patterns of S-linalool synthase gene expression in the C. breweri flower. Plant Cell 8 (1996) 1137–1148. [DOI] [PMID: 8768373]
[EC 4.2.3.25 created 2006]
 
 
EC 5.4.4.4     
Accepted name: geraniol isomerase
Reaction: geraniol = (3S)-linalool
For diagram of acyclic monoterpenoid biosynthesis, click here
Systematic name: geraniol hydroxymutase
Comments: In absence of oxygen the bifunctional linalool dehydratase-isomerase can catalyse in vitro two reactions, the isomerization of (3S)-linalool to geraniol and the hydration of myrcene to (3S)-linalool, the latter activity being classified as EC 4.2.1.127, linalool dehydratase.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB
References:
1.  Brodkorb, D., Gottschall, M., Marmulla, R., Lüddeke, F. and Harder, J. Linalool dehydratase-isomerase, a bifunctional enzyme in the anaerobic degradation of monoterpenes. J. Biol. Chem. 285 (2010) 30436–30442. [DOI] [PMID: 20663876]
2.  Lüddeke, F. and Harder, J. Enantiospecific (S)-(+)-linalool formation from β-myrcene by linalool dehydratase-isomerase. Z. Naturforsch. C 66 (2011) 409–412. [PMID: 21950166]
[EC 5.4.4.4 created 2011, modified 2012]
 
 


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