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.

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In our laboratory, we have isolated a few agar-softening and agar-liquefying bacterial strains from the southern Chilean coast to characterize their extracellular agarases in an attempt to contribute to oc understanding of the basis of agar hydrolysis.

This strain was identified as P. The oligosaccharides were detected by determining the refractive index with a detector Gilson, Middleton, Wis. Cloning and sequencing of agaAa unique aagarolytic gene from a marine agagolytic. At cruder stages the enzyme was strongly bound to DEAE-cellulose, probably through binding to a negatively charged agar or other polysaccharide.

Agar, a polysaccharide present in the cell walls of some red algae, can be degraded by several bacterial strains from marine environments and other sources. In contrast to the agarases from P.

Nature London ; We describe here the identification of a new agarolytic bacterial strain, P. Utilization of l -arabinose, dulcitol, m -inositol, raffinose, and d -ribose. Other biochemical and physiological tests were carried out essentially as described by Bafteria and Gadkari 38 and Stanier et al. Van Hofsteen B, Malmqvist Bacteeia. The dialyzate was loaded onto a DEAE-cellulose column 10 by 1. The agarase gene dagA of Streptomyces coelicolor A3 2: Enzymic cleavage of the alpha linkages in agarose to yield agarooligosaccharides.


Isolation and characterization of Shewanella alga from human clinical specimens and emendation of the description of S. National Center for Biotechnology InformationU. B Effect of temperature on the stability of agarase from P. Based in these data we propose the assignment of our strain as P.

The GenBank accession number for the small subunit of P. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Received Feb 6; Accepted Jul A rapid and sensitive method for the quantitation of microgram quantities utilizing the principle of protein-dye binding.

Phenotypic analysis of the strain. Stolp H, Gadkari D. The enzyme was incubated in 50 mM sodium phosphate at pH 6. Phylogeny of the Vibrionaceae and recommendation for two new genera, Listonella and Shewanella.

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

On the basis of several phenotypic characters and a phylogenetic analysis of the genes coding for the 16S rRNA, this strain was identified as Pseudoalteromonas antarctica strain N The identities of these oligosaccharides were confirmed by thin-layer chromatographic analysis on silica gel plates not shown. Strain N-1 was cultured in liquid medium containing 0. At longer incubation times, the identificatjon produced a red-brown diffusible pigment.

The enzyme was slowly released from the DEAE-cellulose by a washing identificatioh 1.

The assays were carried out in 50 mM phosphate pH 7. This possibility seems feasible because the enzyme could not be eluted from agarose columns as it is on other agarases 3. Please review our privacy policy. Agarase activity was determined by the method of Dygert et al.


Nonpathogenic members of the genus Pseudomonas. In addition, strain N-1, unlike the Shewanella spp. Open in a separate window. Duckworth M, Turvey J R.

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The enzyme was concentrated with polyethylene glycol and dialyzed against buffer A. Based on this property, strain N-1 could be assigned to the genera Alteromonas 671820 or Pseudoalteromonas Agarokytic PMSF was added to a final concentration of 0. HPLC analysis of the hydrolysis products of unsubstituted agar generated by agarase from P. Cloning and gene replacement mutagenesis of a Pseudomonas atlantica agarase gene. In the presence of agar, glucose or galactose did not affect the production of agarase in this strain data not shown.

Purification and characterization of a new agarase from a marine bacterium, Vibrio sp. For liquid cultures, agar 0. Agar clearing, softening, and depressions around the colonies is characteristic for bacteria identiifcation groups 1 and 2. Day D, Yaphe W.

Strain N-1 is a gram-negative rod bacterium, motile by a polar flagellum; it is also obligate aerobic, catalase and oxidase positive, and urease, indole, and arginine dihydrolase negative.

Hydrolysis products of agar by agarase from P. Colonies that formed pits or clearing zones on agar were picked up and purified further by the same plating method.

Furthermore, the reducing power of the agarooligosaccharides is greatly decreased by the presence of 3,6-anhydro- l -galactose at the reducing end The genera Alteromonas and Marinomonas. Purification was attempted after 30 h of incubation. Strain N-1 and P.