The old name was "Aneurinase". 
There are two types: 
- thiaminase+I at the US National Library of Medicine Medical Subject Headings (MeSH) (EC 22.214.171.124)
- thiaminase+II at the US National Library of Medicine Medical Subject Headings (MeSH) (EC 126.96.36.199)
- Bracken (brake), Nardoo and other plants.
- Raw fish, such as carp and goldfish.
- A few strains of bacteria like Bacillus thiaminolyticus, Bacillus aneurinolyticus, or Bacillus subtilis.
- An African silk worm, Anaphe venata
Its physiological meaning for the plant, fish, bacterial cell or insect is not known.
It was once causing economical losses in raising fisheries, e.g. in yellowtail fed raw anchovy as a sole feed for a certain period, and also in sea bream and rainbow trout. The same problem is being studied in a natural food chain system.
The larvae of a wild silk worm Anaphe venata are being consumed in a rain forest district of Nigeria as a supplemental protein nutrition, and the heat resistant thiaminase in it is causing an acute seasonal cerebellar ataxia.
In 1860-61 - Burke and Wills were the first Europeans to cross Australia south to north; on their return they subsisted primarily on raw nardoo-fern and died of beriberi because of the extremely high thiaminase content in an otherwise thiamine-poor diet.
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- Toms A, Haas A, Park J, Begley T, Ealick S (2005). "Structural characterization of the regulatory proteins TenA and TenI from Bacillus subtilis and identification of TenA as a thiaminase II". Biochemistry. 44 (7): 2319–29. PMID 15709744.
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- Adamolekun B, Adamolekun WE, Sonibare AD and Sofowora G. (1944). "A double-blind, placebo-controlled study of the efficacy of thiamin hydrochloride in a seasonal ataxia in Nigerians". Neurology. 44: 549–51.
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