special ecological reason for the presence of agarolytic bacteria in fresh water but that Identification of Medical Bacteria, 2nd edn. Cam-. Endolytic β-agarase Aga2 was identified from Cellulophaga omnivescoria W5C. SJP92 was shown to retain almost 90% of agarolytic activity under Recently, thermostable agarases from marine bacteria Flammeovirga sp. Abstract: Agarolytic bacteria use agarase to utilize agar as sole source of carbon. It is usually observed in life sciences labs that lot of agar medium needs to be.

Author: Mojas Vojora
Country: Vietnam
Language: English (Spanish)
Genre: Environment
Published (Last): 25 May 2012
Pages: 386
PDF File Size: 5.19 Mb
ePub File Size: 18.1 Mb
ISBN: 525-4-55004-668-3
Downloads: 85337
Price: Free* [*Free Regsitration Required]
Uploader: Daigar

Author information Article notes Copyright and License information Disclaimer. The specificity of an agarase from a Cytophaga species. Toffanin for the NMR technical support. Strain N-1 and P. Production of indole, urease, arginine dihydrolase, and accumulation of PHB. The highest level of agarase was reached during the stationary phase.

This strain was identified as P. The purified protein was determined to be homogeneous on the basis of sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and it had a molecular mass of 33 kDa.

Effect of salt concentration on enzyme activity. Purification of agarase N B Oligosaccharides released by agarase. Chromatography of agarase from P. The rDNA sequence identificxtion strain N-1 was compared to sequences available from public databases.

There was a problem providing the content you requested

We describe here the characterization of a new agarolytic bacterium isolated from the southern Chilean coast. In solid agar, this isolate produced a diffusible agarase that caused agar softening around the colonies. Isolation and characterization of Cytophaga flevensis sp. Phenylmethylsulfonylfluoride PMSF was added to a final concentration of 0. Agarase activity was determined by the method of Dygert et al. Int J Syst Bacteriol. Purification and properties of an extracellular agarase from Alteromonas sp.


In the presence of agar, glucose or galactose did not affect the production of agarase in this strain data not shown. Furthermore, the reducing power of the agarooligosaccharides is greatly decreased by the presence of 3,6-anhydro- l -galactose at the reducing end Cleavage of the polysaccharide chains causes agar softening and allows faster evaporation of water, leading to the formation of depressions.

Purification and characterization of a new agarase from a marine bacterium, Vibrio sp.

B Effect of temperature on the stability of agarase from P. The screening was carried out on agar plates in a medium containing 0. The enzyme was slowly released from the DEAE-cellulose by a washing with 1. Enzymatic bacterja of agar: Strain N-1 can also be distinguished from S.

Phylogenetic analysis and alignment. Numerical taxonomy of aerobic, gram-negative bacteria associated with oysters and surrounding seawater of the mediterranean coast.

In contrast to the agarases from P. In both cases the enzyme showed a molecular mass of 16 kDa, indicating an interaction with these resins. The enzyme gave a single band on SDS-polyacrylamide gels Fig. The type of flagellum was determined by negative staining with uranyl acetate and electron microscopy as described by Cole and Popkin The genera Alteromonas and Marinomonas. Phylogeny of the Vibrionaceae and recommendation for two new genera, Listonella and Shewanella.


Purification and some properties of agarase from Pseudomonas sp. Effects of pH and temperature on enzyme activity. Fractions 3 ml were collected, pooled on the basis of activity, and then loaded onto the DEAE-cellulose column 10 by 1. Characterization of the neoagarotetraose and neoagarobiase of Cytophaga flevensis. For liquid cultures, agar 0.

Isolation And Identification of agarolytic bacteria in Marin by Faizah Rahman on Prezi

Cell growth and activity measurements. Cambridge University Press; Enzymic cleavage of the alpha linkages in agarose to yield agarooligosaccharides.

Effect of carbon sources on bacterial growth and agarase production. The single DNA band of approximately 1.

The oligosaccharides were detected by determining the refractive index with a detector Gilson, Middleton, Wis. Degradation of agar by a gram negative bacterium.

Phylogenetic analysis of 16S rRNA. As shown by the HPLC profile, the purified enzyme from strain N-1 hydrolyzed agar to give two main oligosaccharide products Fig. There was no evidence of a signal at An overnight culture of isolated colonies of strain N-1 was prepared in the medium described above and used to inoculate 2 liters of fresh medium containing 0.

Based in these oc we propose the assignment of our strain as P.

Posted in Art