An O-acetylserine (thiol) lyase from Leucaena leucocephala is a cysteine synthase but not a mimosine synthase.

Abstract:

:In plants, the final step of cysteine formation is catalyzed by O-acetylserine (thiol) lyase (OAS-TL). The purpose of this study was to isolate and characterize an OAS-TL from the tree legume Leucaena leucocephala (leucaena). Leucaena contains a toxic, nonprotein amino acid, mimosine, which is also formed by an OAS-TL, and characterization of this enzyme is essential for developing a mimosine-free leucaena for its use as a protein-rich fodder. The cDNA for a cytosolic leucaena OAS-TL isoform was obtained through interspecies suppression subtractive hybridization. A 40-kDa recombinant protein was purified from Escherichia coli and used in enzyme activity assays where it was found to synthesize only cysteine. The enzyme followed Michaelis-Menten kinetics, and the Km was calculated to be 1,850±414 μM sulfide and the Vmax was 200.6±19.92 μM cysteine min(-1). The N-terminal affinity His-tag was cleaved from the recombinant OAS-TL to eliminate its possible interference in binding with the substrate, 3-hydroxy-4-pyridone, for mimosine formation. The His-tag-cleaved OAS-TL was again observed to catalyze the formation of cysteine but not mimosine. Thus, the cytosolic OAS-TL from leucaena used in this study is specific for only cysteine synthesis and is different from previously reported OAS-TLs that also function as β-substituted alanine synthases.

authors

Yafuso JT,Negi VS,Bingham JP,Borthakur D

doi

10.1007/s12010-014-0917-z

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

1157-68

issue

5

eissn

0273-2289

issn

1559-0291

journal_volume

173

pub_type

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