Biochemical studies on the production of neuraminidase by environmental isolates of Vibrio cholerae non-O1 from Bulgaria.

Abstract : Neuraminidase is a key factor in the infectious process of many viruses and pathogenic bacteria. The neuraminidase enzyme secreted by the etiological agent of cholera - Vibrio cholerae О1 - is well studied in contrast with the one produced by non-O1/non-O139 V. cholerae. Environmental non-O1/non-O139 V. cholerae isolates from Bulgaria were screened for production of neuraminidase. The presence of the neuraminidase gene nanH was detected in 18.5% of the strains. Тhe strain showing highest activity (30 U/mL), V. cholerae non-O1/13, was used to investigate the enzyme production in several media and at different aeration conditions. The highest production of extracellular neuraminidase was observed under microaerophilic conditions, which is possibly related to its role in the infection of intestine epithelium, where the oxygen content is low. On the other hand, this is another advantage of the microbe in such microaerophilic environments as sediments and lake mud. The highest production of intracellular neuraminidase was observed at anaerobic conditions. The ratio of extracellular to intracellular neuraminidase production in V. cholerae was investigated. The temperature optimum of the enzyme was determined to be 50 °C and the pH optimum to be 5.6-5.8.
Document type :
Journal articles
Complete list of metadatas

https://hal-riip.archives-ouvertes.fr/pasteur-00748946
Contributor : Petar Grozdanov <>
Submitted on : Tuesday, November 6, 2012 - 12:49:59 PM
Last modification on : Monday, October 8, 2018 - 5:44:06 PM
Long-term archiving on: Saturday, December 17, 2016 - 7:46:37 AM

File

 Restricted access
To satisfy the distribution rights of the publisher, the document is embargoed until : jamais

Please log in to resquest access to the document

Identifiers

Collections

Citation

Rumyana Eneva, Stephan Engibarov, Tanya Strateva, Radoslav Abrashev, Ignat Abrashev. Biochemical studies on the production of neuraminidase by environmental isolates of Vibrio cholerae non-O1 from Bulgaria.. Canadian Journal of Microbiology, NRC Research Press, 2011, 57 (7), pp.606-10. ⟨10.1139/w11-042⟩. ⟨pasteur-00748946⟩

Share

Metrics

Record views

196