Meganema perideroedes: Difference between revisions

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Contents
Classification
Species
Description and Significance
Genome Structure
Cell Structure, Metabolism and Life Cycle
Ecology
References
Authors
Classification
Classification
Domain: Bacteria
Phylum: Proteobacteria
Class: Alphaproteobacteria
Order: Rhizobiales
Family: Methylobacteriaceae
Species: Meganema


Description and significance
Description and significance
Line 5: Line 37:
Filamentous bacteria in the class Alphaproteobacteria, identified in sludge from an industrial wastewater treatment plant.  Phylogenetic analysis of the 16S rRNA showed that the strain forms a monophyletic cluster with five strains in the same Alphaproteobacteria class.  However, Meganema perideroedes is phenotypically different from its closest relative, filamentous bacteria Brevundimonas vesicularis.  The optimum temperature of growth is 30 degrees celcius with a salinity of 2% NaCl.  Meganema perideroedes was studied in depth because its filamentous morphology, Nostocoida limicola Type II, often causes bulking problems in activated sludge wastewater treatment plants.  In order to find efficient control methods, knowledge of the physiology and ecology of the bacteria is important.
Filamentous bacteria in the class Alphaproteobacteria, identified in sludge from an industrial wastewater treatment plant.  Phylogenetic analysis of the 16S rRNA showed that the strain forms a monophyletic cluster with five strains in the same Alphaproteobacteria class.  However, Meganema perideroedes is phenotypically different from its closest relative, filamentous bacteria Brevundimonas vesicularis.  The optimum temperature of growth is 30 degrees celcius with a salinity of 2% NaCl.  Meganema perideroedes was studied in depth because its filamentous morphology, Nostocoida limicola Type II, often causes bulking problems in activated sludge wastewater treatment plants.  In order to find efficient control methods, knowledge of the physiology and ecology of the bacteria is important.


Genome Structure
The size of the bacteria in megabase pairs or (Mb) is 3.41.
The guanine and cytosine percentage is GC% 67.2. - 42.9 mol% of G+C content- specific strain
Number of Genes 3,134
Number of Proteins 3,084
Total Sequence Length 3,409,949
Number of Scaffold 17
Number of Chromosomes 0
Number of plasmids 0
Entire genome has been sequenced
Cell Structure, Metabolism and Life Cycle


Cell structure and metabolism
Cell Structure Characteristics


The cell structure appears to be bent/curled, occasionally tangled filaments that are not motile or branched. The filament length measures to be greater than 200 micrometers with the diameter being about 1.4-2.0 micrometers. The septa is visible but the sheath and any attached growth are absent. Cell shape varies from spherical, discoid or ovoid shaped. Other granules may be present but there is no sulfur storage. The cell is Gram negative and Neisser negative even though some cells would stain Gram positive.
Metabolism 
Many of the isolates that have been observed of this bacteria are Gram negative bacteria. These bacteria are oxidase and catalase-positive and obligate aerobic.  It has been observed that the bacteria under aerobic conditions consume acetate and glucose. They also have a high substrate uptake capability. Many filamentous bacteria have a high substrate affinity and this one follows that characteristic. Using MAR-FISH all substrates were offered and that main ones that were taken up were acetate, propionate, butyrate, oleic acid, and glucose. There was also an uptake of sugars and amino acids.
When nitrate is an electron acceptor cannot grow anaerobically.


Ecology
Ecology
Found in the sludge of industrial wastewater treatment plants.  Five strains were isolated from the sludge and 16S rRNA analysis showed that the strains form a monophyletic cluster.  Meganema perideroedes consumes acetate and glucose under aerobic conditions with an unusually high substrate uptake.
Found in the sludge of industrial wastewater treatment plants.  Five strains were isolated from the sludge and 16S rRNA analysis showed that the strains form a monophyletic cluster.  Meganema perideroedes consumes acetate and glucose under aerobic conditions with an unusually high substrate uptake.


Habitat


Known habitat is a mixture of activated sludges


References
Uptake of Substrates Under Aerobic Conditions
 
M. perideroedes Microcolonies in sludge flocs
 
Formate − +


Acetate ++ +


Propionate ++ ++


Butyrate + ++


Pyruvate − ++


Oleic acid ++ +


Glucose ++ ++


Galactose + ++


Mannose + +


Glycine + +


Leucine + ++


Ethanol − ++


Contents [hide]
Bicarbonate + thiosulfate − +
1 Classification
1.1 Species
2 Description and Significance
3 Genome Structure
4 Cell Structure, Metabolism and Life Cycle
5 Ecology and Pathogenesis
6 References
7 Author
Classification


Classification


Domain: Bacteria
: No silver grains (no substrate uptake). +: Few silver grains, but clearly positive. ++: Positive, many silver grains.

Phylum: Proteobacteria
Class: Alphaproteobacteria
Order: Rhizobiales
Family: Methylobacteriaceae
Species: Meganema


Uptake of Substrates Under Anaerobic Conditions


Species
Table 2.  Uptake of organic substrates by M. perideroedes under conditions where nitrate or nitrite serve as electron acceptor and anaerobic conditions as investigated by MAR
NCBI: Taxonomy
Genus species
Description and Significance


Describe the appearance, habitat, etc. of the organism, and why you think it is important.
  Nitrate Nitrite Anaerobic


Genome Structure
  M. perideroedes Floca M. perideroedes Floca M. perideroedes Floca


Size(Mb) 3.41
Formate − + − + − +
GC% 67.2
Number of Genes 3,134
Number of Proteins 3,084
Total Sequence Length 3,409,949
Number of Scaffold 17
Number of Chromosomes 0
Number of plasmids 0


Acetate + + + + − +


Describe the size and content of the genome. How many chromosomes? Circular or linear? Other interesting features? What is known about its sequence?
Propionate + + − + − +


Butyrate − + − + − +


Cell Structure, Metabolism and Life Cycle
Oleic acid − + − + − +
Glucose + + + + − +


Cell Structure Characteristics
Galactose + + − + − +
The cell structure appears to be bent/curled, occasionally tangled filaments that are not motile or branched. The filament length measures to be greater than 200 micrometers with the diameter being about 1.4-2.0 micrometers. The septa is visible but the sheath and any attached growth are absent. Cell shape varies from spherical, discoid or ovoid shaped. Other granules may be present but there is no sulfur storage. The cell is Gram negative and Neisser negative even though some cells would stain Gram positive.


Metabolism 
Mannose − + − + − +
Many of the isolates that have been observed of this bacteria are Gram negative bacteria. These bacteria are oxidase and catalase-positive and obligate aerobic.  It has been observed that the bacteria under aerobic conditions consume acetate and glucose. They also have a high substrate uptake capability. Many filamentous bacteria have a high substrate affinity and this one follows that characteristic. Using MAR-FISH all substrates were offered and that main ones that were taken up were acetate, propionate, butyrate, oleic acid, and glucose. There was also an uptake of sugars and amino acids.
Life Cycle
Interesting features of cell structure; how it gains energy; what important molecules it produces.


Glycine − + − + − +


Leucine − ++ − ++ − +



−: No silver grains (no substrate uptake). +: Few silver grains, but clearly positive. ++: Positive, many silver grains.




aMicrocolonies in sludge flocs.



References


Ecology  
Kragelund, C., Nielsen, J. L., Thomsen, T. R. and Nielsen, P. H. (2005), Ecophysiology of the filamentous Alphaproteobacterium Meganema perideroedes in activated sludge. FEMS Microbiology Ecology, 54: 111–112. doi: 10.1016/j.femsec.2005.03.002


Habitat; symbiosis; biogeochemical significance; contributions to environment.
Thomsen, T. R.. "Meganema perideroedes gen. nov., sp. nov., a filamentous alphaproteobacterium from activated sludge." International Journal of Systematic and Evolutionary Microbiology (): 1865-1868. Print.
If relevant, how does this organism cause disease? Human, animal, plant hosts? Virulence factors, as well as patient symptoms.


Authors


References
David Bur


http://www.asissludge.com/pdf/Meganema%20p.pdf
Danielle Stawkey
http://onlinelibrary.wiley.com/doi/10.1016/j.femsec.2005.03.002/full


Author
https://microbewiki.kenyon.edu/images/5/52/FEM_111_f1.gif

Latest revision as of 14:18, 4 October 2017

This student page has not been curated.

Contents

Classification

Species

Description and Significance

Genome Structure

Cell Structure, Metabolism and Life Cycle

Ecology

References

Authors

Classification

Domain: Bacteria

Phylum: Proteobacteria

Class: Alphaproteobacteria

Order: Rhizobiales

Family: Methylobacteriaceae

Species: Meganema

Description and significance

Filamentous bacteria in the class Alphaproteobacteria, identified in sludge from an industrial wastewater treatment plant. Phylogenetic analysis of the 16S rRNA showed that the strain forms a monophyletic cluster with five strains in the same Alphaproteobacteria class. However, Meganema perideroedes is phenotypically different from its closest relative, filamentous bacteria Brevundimonas vesicularis. The optimum temperature of growth is 30 degrees celcius with a salinity of 2% NaCl. Meganema perideroedes was studied in depth because its filamentous morphology, Nostocoida limicola Type II, often causes bulking problems in activated sludge wastewater treatment plants. In order to find efficient control methods, knowledge of the physiology and ecology of the bacteria is important.

Genome Structure

The size of the bacteria in megabase pairs or (Mb) is 3.41. The guanine and cytosine percentage is GC% 67.2. - 42.9 mol% of G+C content- specific strain Number of Genes 3,134 Number of Proteins 3,084 Total Sequence Length 3,409,949 Number of Scaffold 17 Number of Chromosomes 0 Number of plasmids 0 Entire genome has been sequenced

Cell Structure, Metabolism and Life Cycle

Cell Structure Characteristics

The cell structure appears to be bent/curled, occasionally tangled filaments that are not motile or branched. The filament length measures to be greater than 200 micrometers with the diameter being about 1.4-2.0 micrometers. The septa is visible but the sheath and any attached growth are absent. Cell shape varies from spherical, discoid or ovoid shaped. Other granules may be present but there is no sulfur storage. The cell is Gram negative and Neisser negative even though some cells would stain Gram positive.

Metabolism

Many of the isolates that have been observed of this bacteria are Gram negative bacteria. These bacteria are oxidase and catalase-positive and obligate aerobic. It has been observed that the bacteria under aerobic conditions consume acetate and glucose. They also have a high substrate uptake capability. Many filamentous bacteria have a high substrate affinity and this one follows that characteristic. Using MAR-FISH all substrates were offered and that main ones that were taken up were acetate, propionate, butyrate, oleic acid, and glucose. There was also an uptake of sugars and amino acids.

When nitrate is an electron acceptor cannot grow anaerobically.


Ecology

Found in the sludge of industrial wastewater treatment plants. Five strains were isolated from the sludge and 16S rRNA analysis showed that the strains form a monophyletic cluster. Meganema perideroedes consumes acetate and glucose under aerobic conditions with an unusually high substrate uptake.

Habitat

Known habitat is a mixture of activated sludges

Uptake of Substrates Under Aerobic Conditions

M. perideroedes Microcolonies in sludge flocs

Formate − +

Acetate ++ +

Propionate ++ ++

Butyrate + ++

Pyruvate − ++

Oleic acid ++ +

Glucose ++ ++

Galactose + ++

Mannose + +

Glycine + +

Leucine + ++

Ethanol − ++

Bicarbonate + thiosulfate − +


−: No silver grains (no substrate uptake). +: Few silver grains, but clearly positive. ++: Positive, many silver grains.


Uptake of Substrates Under Anaerobic Conditions

Table 2.  Uptake of organic substrates by M. perideroedes under conditions where nitrate or nitrite serve as electron acceptor and anaerobic conditions as investigated by MAR

  Nitrate Nitrite Anaerobic

  M. perideroedes Floca M. perideroedes Floca M. perideroedes Floca

Formate − + − + − +

Acetate + + + + − +

Propionate + + − + − +

Butyrate − + − + − +

Oleic acid − + − + − +

Glucose + + + + − +

Galactose + + − + − +

Mannose − + − + − +

Glycine − + − + − +

Leucine − ++ − ++ − +


−: No silver grains (no substrate uptake). +: Few silver grains, but clearly positive. ++: Positive, many silver grains.



aMicrocolonies in sludge flocs.



References

Kragelund, C., Nielsen, J. L., Thomsen, T. R. and Nielsen, P. H. (2005), Ecophysiology of the filamentous Alphaproteobacterium Meganema perideroedes in activated sludge. FEMS Microbiology Ecology, 54: 111–112. doi: 10.1016/j.femsec.2005.03.002

Thomsen, T. R.. "Meganema perideroedes gen. nov., sp. nov., a filamentous alphaproteobacterium from activated sludge." International Journal of Systematic and Evolutionary Microbiology (): 1865-1868. Print.

Authors

David Bur

Danielle Stawkey

https://microbewiki.kenyon.edu/images/5/52/FEM_111_f1.gif