Abstract
Nitric oxide (NO) is a versatile regulatory molecule that affects enzymatic activity through chemical modification of reactive amino acid residues (e.g., Cys and Tyr) and by binding to metal centers. In the present study, the inhibitory effect of the NO-donors S-nitroso-glutathione (GSNO), (±)E-4-ethyl-2-[E-hydroxyimino]-5-nitro-3-hexenamide (NOR-3), and S-nitroso-N-acetyl-penicillamine (SNAP) on the catalytic activity of Azotobacter vinelandii rhodanese (RhdA) has been investigated. GSNO, NOR-3, and SNAP inhibit RhdA sulfurtransferase activity in a concentration- and time-dependent fashion. The absorption spectrum of the NOR-3-treated RhdA displays a maximum at 335 nm, indicating NO-mediated S-nitrosylation. RhdA inhibition by NO-donors correlates with S-nitrosothiol formation. The reducing agent dithiothreitol prevents RhdA inhibition by NO-donors, fully restores the catalytic activity, and reverts the NOR-3-induced RhdA absorption spectrum to that of the active enzyme. These results indicate that RhdA inhibition occurs via NO-mediated S-nitrosylation of the unique Cys230 catalytic residue.
| Original language | English |
|---|---|
| Pages (from-to) | 1002-1007 |
| Number of pages | 6 |
| Journal | Biochemical and Biophysical Research Communications |
| Volume | 306 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - Jul 11 2003 |
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Keywords
- Enzyme inhibition
- NO-donors
- Phosphatase
- Rhodanese
- Sulfurtransferase
ASJC Scopus subject areas
- Biochemistry
- Biophysics
- Molecular Biology
Cite this
Inhibition of Azotobacter vinelandii rhodanese by NO-donors. / Spallarossa, Andrea; Forlani, Fabio; Pagani, Silvia; Salvati, Luca; Visca, Paolo; Ascenzi, Paolo; Bolognesi, Martino; Bordo, Domenico.
In: Biochemical and Biophysical Research Communications, Vol. 306, No. 4, 11.07.2003, p. 1002-1007.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Inhibition of Azotobacter vinelandii rhodanese by NO-donors
AU - Spallarossa, Andrea
AU - Forlani, Fabio
AU - Pagani, Silvia
AU - Salvati, Luca
AU - Visca, Paolo
AU - Ascenzi, Paolo
AU - Bolognesi, Martino
AU - Bordo, Domenico
PY - 2003/7/11
Y1 - 2003/7/11
N2 - Nitric oxide (NO) is a versatile regulatory molecule that affects enzymatic activity through chemical modification of reactive amino acid residues (e.g., Cys and Tyr) and by binding to metal centers. In the present study, the inhibitory effect of the NO-donors S-nitroso-glutathione (GSNO), (±)E-4-ethyl-2-[E-hydroxyimino]-5-nitro-3-hexenamide (NOR-3), and S-nitroso-N-acetyl-penicillamine (SNAP) on the catalytic activity of Azotobacter vinelandii rhodanese (RhdA) has been investigated. GSNO, NOR-3, and SNAP inhibit RhdA sulfurtransferase activity in a concentration- and time-dependent fashion. The absorption spectrum of the NOR-3-treated RhdA displays a maximum at 335 nm, indicating NO-mediated S-nitrosylation. RhdA inhibition by NO-donors correlates with S-nitrosothiol formation. The reducing agent dithiothreitol prevents RhdA inhibition by NO-donors, fully restores the catalytic activity, and reverts the NOR-3-induced RhdA absorption spectrum to that of the active enzyme. These results indicate that RhdA inhibition occurs via NO-mediated S-nitrosylation of the unique Cys230 catalytic residue.
AB - Nitric oxide (NO) is a versatile regulatory molecule that affects enzymatic activity through chemical modification of reactive amino acid residues (e.g., Cys and Tyr) and by binding to metal centers. In the present study, the inhibitory effect of the NO-donors S-nitroso-glutathione (GSNO), (±)E-4-ethyl-2-[E-hydroxyimino]-5-nitro-3-hexenamide (NOR-3), and S-nitroso-N-acetyl-penicillamine (SNAP) on the catalytic activity of Azotobacter vinelandii rhodanese (RhdA) has been investigated. GSNO, NOR-3, and SNAP inhibit RhdA sulfurtransferase activity in a concentration- and time-dependent fashion. The absorption spectrum of the NOR-3-treated RhdA displays a maximum at 335 nm, indicating NO-mediated S-nitrosylation. RhdA inhibition by NO-donors correlates with S-nitrosothiol formation. The reducing agent dithiothreitol prevents RhdA inhibition by NO-donors, fully restores the catalytic activity, and reverts the NOR-3-induced RhdA absorption spectrum to that of the active enzyme. These results indicate that RhdA inhibition occurs via NO-mediated S-nitrosylation of the unique Cys230 catalytic residue.
KW - Enzyme inhibition
KW - NO-donors
KW - Phosphatase
KW - Rhodanese
KW - Sulfurtransferase
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U2 - 10.1016/S0006-291X(03)01067-2
DO - 10.1016/S0006-291X(03)01067-2
M3 - Article
VL - 306
SP - 1002
EP - 1007
JO - Biochemical and Biophysical Research Communications
JF - Biochemical and Biophysical Research Communications
SN - 0006-291X
IS - 4
ER -