Abstract:
:A set of filamentous fungi (42 strains) was screened for alpha-N-acetylgalactosaminidase activity, and a series of inducers and different cultivation conditions were tested. Enzyme production by the best producer Aspergillus niger CCIM K2 was optimized and scaled up. alpha-N-Acetylgalactosaminidase was purified to apparent homogeneity by cation exchange chromatography, gel filtration, and chromatofocusing, and basic biochemical data of the enzyme were determined: The native molecular weight was estimated by gel filtration to be approximately 440 kDa, the molecular weight of the subunit was determined to be 76 kDa and the pI = 4.8. The K (M) was 0.73 mmol/l for o-nitrophenyl 2-acetamido-2-deoxy-alpha-D-galactopyranoside (o-NP-alpha-GalNAc), and optimum enzyme activity was achieved at pH 1.8 and 55 degrees C. This alpha-N-acetylgalactosaminidase is a retaining-type glycosidase, and it was N-deglycosylated without any loss of activity.
journal_name
Appl Microbiol Biotechnoljournal_title
Applied microbiology and biotechnologyauthors
Weignerová L,Filipi T,Manglová D,Kren Vdoi
10.1007/s00253-008-1485-3subject
Has Abstractpub_date
2008-07-01 00:00:00pages
769-74issue
5eissn
0175-7598issn
1432-0614journal_volume
79pub_type
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