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Cloning and expression of a member of the Aspergillus niger gene family encoding α-galactosidase

✍ Scribed by den Herder, Irma F. ;Mateo Rosell, Ana M. ;van Zuilen, Caren M. ;Punt, Peter J. ;van den Hondel, Cees A. M. J. J.


Publisher
Springer
Year
1992
Tongue
English
Weight
897 KB
Volume
233
Category
Article
ISSN
0026-8925

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✦ Synopsis


An enzyme with alpha-galactosidase activity and an apparent molecular weight of 82 kDa was purified from culture medium of Aspergillus niger. The N-terminal amino acid sequence of the purified protein shows similarity to the N-terminal amino acid sequence of alpha-galactosidases from several other organisms. Oligonucleotides, based on the N-terminal amino acid sequence, were used as probes to clone the corresponding gene from a lambda EMBL3 gene library of A. niger. The cloned gene (aglA) was shown to be functional by demonstrating that the 82 kDa alpha-galactosidase is absent from a strain with a disruption of the aglA gene, and is over-produced in strains containing multiple copies of the aglA gene. Enzyme activity assays revealed that the 82 kDa alpha-galactosidase A represents a minor extracellular alpha-galactosidase activity in A. niger.


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