| Literature DB >> 8987901 |
P Selvakumar1, L Ashakumary, A Helen, A Pandey.
Abstract
Glucoamylases produced by Aspergillus niger grown on wheat brain in solid cultures were purified. Four different forms, GA I, GA I', GA II and GA III, were found having apparent molecular weights of 112,000, 104,000, and 74,000 and 61,000 Da respectively. The enzymes are glycoproteins with a carbohydrate content of 16%, and optimal activity at 60 degrees C and pH 4.4. Activity was strongly inhibited by Hg2+ while Mn2+ and Fe2+ were stimulatory. The Km values for the degradation of starch and maltose were 3.5 and 7.8 mg ml-1, respectively.Entities:
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Year: 1996 PMID： 8987901 DOI： 10.1111/j.1472-765x.1996.tb01346.x
Source DB: PubMed Journal: Lett Appl Microbiol ISSN： 0266-8254 Impact factor: 2.858