Lu H, Han RL, Jiang XN. Heterologous expression and characterization of a proxidomal ascorbate peroxidase from Populus tomentosa.
Mol Biol Rep 2007;
36:21-7. [PMID:
17899442 DOI:
10.1007/s11033-007-9147-6]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Accepted: 09/13/2007] [Indexed: 11/24/2022]
Abstract
The present study reported for the first time, cloning, expression and characteristics of a Proxidomal APX gene (PpAPX) from Populus tomentosa. The PpAPX gene encodes a protein of 287 amino acid residues with a calculated molecular mass of 31.58 kDa. The over-expressed recombinant PpAPX protein showed high activity towards the substrates ascorbate aicd (ASA) and H(2)O(2). At fixed ASA concentrations, the K (m) and V (max) values were 0.12 +/- 0.01 mM and 23.4 +/- 4.2 mmol/min mg for H(2)O(2). And at fixed H(2)O(2) concentrations, the K (m) and V (max) values were 0.53 +/- 0.04 mM and 20.0 +/- 2.3 mmol/min mg for ASA.
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