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MetaCyc Enzyme: alliinase

Gene: cysteine sulfoxide lyase Accession Number: G-10282 (MetaCyc)

Synonyms: cysteine lyase

Species: Allium cepa

Summary:
A novel alliinase was purified to homogeneity from roots of onion (Allium cepa). The purification yielded two isoforms with similar substrate preference. However, they differed from each other in their glycosylation with isoform II having additional terminal mannose structures. A cDNA isolated from the onion root showed identical amino acid sequence to isoform II confirming this isoform as the allinase residing in the root. Unlike other alliinases the protein was shown to have both cysteine lyase as well as cysteine sulfoxide lyase (allinase) activities. The protein catalyzed the conversion of isoallin to 1-propenylsulfenate with high efficiency. The protein had isoelectric points of 7.6, 7.9, 8.1 and 8.3. Vmax for isoallin as substrate was 21,524 nkat/mg. The alliinase was mainly expressed in onion roots [Lancaster00a].

Molecular Weight of Polypeptide: 51.2 kD (from nucleotide sequence), 57.5 kD (experimental) [Lancaster00a ]

Unification Links: Entrez:AAF36437 , Protein Model Portal:Q9M7L9 , SMR:Q9M7L9 , UniProt:Q9M7L9

Relationship Links: Entrez-Nucleotide:PART-OF:AF126049 , InterPro:IN-FAMILY:IPR006947 , InterPro:IN-FAMILY:IPR006948 , InterPro:IN-FAMILY:IPR015421 , InterPro:IN-FAMILY:IPR015422 , InterPro:IN-FAMILY:IPR015424 , Pfam:IN-FAMILY:PF04863 , Pfam:IN-FAMILY:PF04864

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

GO Terms:

Molecular Function: GO:0047654 - alliin lyase activity Inferred from experiment [Lancaster00a]

Credits:
Created 05-Nov-2007 by Pujar A , Cornell University
Revised 15-Jun-2012 by Foerster H , Boyce Thompson Institute


Enzymatic reaction of: methiin lyase (alliinase)

methiin <=> methanesulfenate + 2-aminoprop-2-enoate + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

The reaction is favored in the direction shown.

In Pathways: methiin metabolism


Enzymatic reaction of: ethiin lyase (alliinase)

ethiin <=> ethylsulfenate + 2-aminoprop-2-enoate + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

The reaction is favored in the direction shown.

In Pathways: superpathway of Allium flavor precursors , ethiin metabolism


Enzymatic reaction of: isoalliin lyase (alliinase)

(+)-trans-isoalliin <=> (E) 1-propenylsulfenate + 2-aminoprop-2-enoate + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the Enzyme Commission system.

The reaction is favored in the direction shown.

In Pathways: superpathway of Allium flavor precursors , propanethial S-oxide biosynthesis

Kinetic Parameters:

Substrate
Km (μM)
(+)-trans-isoalliin
3000.0


References

Lancaster00a: Lancaster JE, Shaw ML, Joyce MD, McCallum JA, McManus MT (2000). "A novel alliinase from onion roots. Biochemical characterization and cDNA cloning." Plant Physiol 122(4);1269-79. PMID: 10759524


Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Mon Mar 30, 2015, BIOCYC13B.