June 15, 2020

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: Negul Mocage
Country: Gambia
Language: English (Spanish)
Genre: Software
Published (Last): 14 July 2011
Pages: 223
PDF File Size: 19.14 Mb
ePub File Size: 20.42 Mb
ISBN: 878-3-96608-931-7
Downloads: 35385
Price: Free* [*Free Regsitration Required]
Uploader: Aragami

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. No activity was observed when other carbon sources, such as glucose or galactose, were used instead of agar as the sole carbon source.

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.

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

Genomic DNA was prepared by the procedure of Ausubel et al. Proteins were stained with Coomassie brilliant blue R Agarotriose was the smallest product detected in this system. In the presence of agar, glucose or galactose did not affect the production of agarase in this strain data not shown.

Effect of salt concentration on enzyme activity. Oxidation and fermentation identidication were done in MOF medium as recommended by Leifson 26but without agar. Strain N-1 was cultured in liquid medium containing 0. DNA base composition of Rickettsia tsutsugamushi determined by reversed-phase high-performance liquid chromatography.

Furthermore, agaarolytic reducing power of the agarooligosaccharides is greatly decreased by the presence of 3,6-anhydro- l -galactose at the reducing end Enzymic cleavage of the alpha linkages in agarose to yield agarooligosaccharides. Cell growth and activity measurements. Received Feb 6; Accepted Jul Sugano Y, Noma M.


For liquid cultures, agar 0.

There was a problem providing the content you requested

The release of proteases into the medium during the stationary phase was demonstrated utilizing Azocoll Calbiochem-Behring, La Jolla, Calif. An extracellular agarase was purified by ammonium sulfate precipitation, gel filtration, and ion-exchange chromatography on DEAE-cellulose. K m values of 0. Nonpathogenic members of the genus Pseudomonas.

We describe here the identification of a new agarolytic bacterial strain, P. The amount of pigment was dependent on the addition of tyrosine to the culture medium, suggesting agarolytif presence of a melaninlike pigment 2. The oligosaccharides were detected by determining the refractive index with a detector Gilson, Middleton, Wis.

Determination of reducing sugar with improved precision. Enzyme hydrolysis of agar and properties of bacterial agarases.

The amounts of protein in the pooled fractions were estimated by the method of Bradford 12 with fructose-1,6-bisphosphatase idenification the standard. The unrooted tree was constructed by neighbor-joining analysis.

The sequence of the 16S rDNA of strain N-1 was aligned with the sequences of a number of Pseudoalteromonas strains available and was analyzed essentially as described by Gauthier et al. Production of iddentification, urease, arginine dihydrolase, and accumulation of PHB.

The GenBank accession number for the small subunit of P. In contrast to the agarases from P.

The exception is Alteromonas sp. At this step the enzyme eluted in the flowthrough, indicating that the strong binding seen at the beginning of the purification could be mediated by an unidentified extracellular component of this strain or by an agar-derived product that is separated during the gel filtration step.

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


This effect would be related to the production of low-molecular-weight agarases that can diffuse though the gel pores. Utilization of N -acetylglucosamine, cellobiose, d -fructose, d -galactose, d -glucose, glycogen, identificaiton, lactose, maltose, d -mannose, mannitol, sacarose, and d -xylose.

PMSF was added to a final concentration of 0. Phylogenetic analysis of 16S rRNA. Other biochemical afarolytic physiological tests were carried out essentially as described by Stolp and Gadkari 38 and Stanier et al.

Barbeyron H, Kloareg B. In contrast, the reducing powers of the products generated by agarase from P. Agar clearing, softening, and depressions around the colonies is characteristic for bacteria in groups 1 and 2.

Agar-decomposing strains of the Actinomyces coelicolor species group. HPLC analysis of the hydrolysis products of unsubstituted agar generated by agarase from P. Phylogenetic analysis and assessment of the genera VibrioPhotobacteriumand Plesiomonas deduced from small-subunit rRNA sequences. The type of flagellum was determined by negative staining with uranyl acetate and electron microscopy as described by Cole and Popkin The enzyme was stable under the conditions of this assay as determined by measuring the residual activity at pH 7.

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 enzyme was purified by taking advantage of its high binding affinity to DEAE-cellulose when loaded at low salt concentrations at cruder stages. At cruder stages the enzyme was strongly bound to DEAE-cellulose, probably through binding to a negatively charged agar or other polysaccharide.

Posted in Travel