Cloning of the SAP6 gene of Metschnikowia reukaufii and its heterologous expression and characterization in Escherichia coli.

Abstract:

:The SAP6 gene (without signal sequence) encoding Metschnikowia reukaufii acid protease was amplified by PCR and fused to the expression vector pET-24a(+). The carboxy-terminal 6x His-tagged recombinant acid protease (rSAP6) was expressed from pET-24a(+)SAP6-6His in Escherichia coli BL21 (DE3) and purified with affinity chromatography using a Ni-NTA column. SDS-PAGE analysis and Western blotting revealed that the molecular mass of the purified rSAP6 was 54kDa. The optimal temperature and pH of the purified rSAP6 were 40 degrees C and 3.4, respectively. The enzyme was stable below 45 degrees C and between pH 2.6 and 5.0. The results show that Mn(2+) had an activating effect on the enzyme, while Cu(2+), Mg(2+), Zn(2+) and Ag(+) acted as inhibitors of the enzyme. However, Ca(2+) had no effect on the enzyme activity. The purified rSAP6 was characterized as an aspartic protease as it was inhibited by aspartic protease-specific inhibitors, such as pepstatin. It was also found that the purified rSAP6 had milk-clotting activity.

journal_name

Microbiol Res

journal_title

Microbiological research

authors

Li J,Chi Z,Wang X

doi

10.1016/j.micres.2008.08.003

subject

Has Abstract

pub_date

2010-03-31 00:00:00

pages

173-82

issue

3

eissn

0944-5013

issn

1618-0623

pii

S0944-5013(08)00052-9

journal_volume

165

pub_type

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