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Topic: Buchnera


In the News (Mon 24 Jun 19)

  
  Buchnera sp
The aphids also benefit from them because they live in low nutrient environments and the Buchnera provide them with amino acids.
It is also known that the two could not reproduce without each other.
Buchnera makes these amino acids available to the aphids.
web.umr.edu /~microbio/BIO221_2002/buchnera_sp.htm   (304 words)

  
 Postsymbiotic plasmid acquisition and evolution of the repA1-replicon in Buchnera aphidicola -- Van Ham et al., ...
Buchnera aphidicola is an obligate, strictly vertically transmitted, bacterial symbiont of aphids.
The Evolutionary Fate of Nonfunctional DNA in the Bacterial Endosymbiont Buchnera aphidicola
Molecular Characterization of the Leucine Cluster in Buchnera sp.
www.pnas.org /cgi/content/abstract/180310197v1   (581 words)

  
 A Strong Effect of AT Mutational Bias on Amino Acid Usage in Buchnera is Mitigated at High-Expression Genes -- Palacios ...
Amino acids that are significantly underrepresented in high-expression Buchnera genes (dark shadow) tend to be aromatic and use relatively AT-rich codons.
Buchnera genes (i.e., with D{H,L} < 0; Trp, Leu, Phe, Tyr,
Wernegreen J. Moran, 1999 Evidence for genetic drift in endosymbionts (Buchnera): analyses of protein-coding genes Mol.
mbe.oxfordjournals.org /cgi/content/full/19/9/1575   (5501 words)

  
  introduction to Buchnera   (Site not responding. Last check: )
Buchnera are prokaryotic cells 1-2 um in diameter and belong to the gasmma-Proteobacteria, closely related to the Enterobacteriaceae family.
Buchnera genome sequence is a perfect treasure for a broad range of biologists, including those interested in evolution, microbiology, ecological interactions, microbial pathogenesis, and comparative genomics.
Genome sequence of the endocellular bacterial symbiont of aphids Buchnera sp.APS.
buchnera.gsc.riken.go.jp /intro.html   (0 words)

  
 Aphid symbiosis
Buchnera aphidicola, the symbiont of Schizaphis graminum, carries on a plasmid the two genes trpEG which are important in tryptophan synthesis.
An important aspect in the evolution of this symbiosis is the vertical transmission of the symbionts (from parent to offspring), indicating coevolution of the bacteria and host.
Genome sequence of the endocellular bacterial symbiont of aphids Buchnera sp.
web.uconn.edu /mcbstaff/graf/BuAp/Baphidright.htm   (1138 words)

  
 Mutational and Selective Pressures on Codon and Amino Acid Usage in Buchnera, Endosymbiotic Bacteria of Aphids -- Rispe ...
Baumann, L. and Baumann, P. Growth kinetics of the endosymbiont Buchnera aphidicola in the aphid Schizaphis graminum.
Palacios, C. and Wernegreen, J.J. A strong effect of AT mutational bias on amino acid usage in Buchnera is mitigated at high-expression genes.
Wernegreen, J.J. and Moran, N.A. Evidence for genetic drift in endosymbionts (Buchnera): Analyses of protein-coding genes.
www.genome.org /cgi/content/full/14/1/44   (6249 words)

  
 symbiosis in animals
genome sequence of Buchnera, >22,00 ESTs of pea aphid.
The principal function of Buchnera is to provide the insect with essential amino acids, nutrients in short supply in the aphid diet of plant phloem sap.
Genomic: Buchnera has genes for enzymes in essential amino acid biosynthetic pathways, despite extensive loss of other genes, including most genes in the synthesis of non-essential amino acids.
www.york.ac.uk /depts/biol/units/symbiosis/intra-symbiosis.html   (934 words)

  
 Genome Biology | Full text | The process of genome shrinkage in the obligate symbiont Buchnera aphidicola
To examine the process of genome reduction, the tiny genome of the endosymbiont Buchnera aphidicola was compared to the larger ancestral genome, reconstructed on the basis of the phylogenetic distribution of gene orthologs among fully sequenced relatives of Escherichia coli and Buchnera.
Buchnera is a mutualistic endosymbiont of its host, but the pattern of reductions of numbers of genes among functional categories is similar between Buchnera and other fully sequenced small-genome bacteria, all obligate pathogens [8,12,15,16].
Buchnera spacers can be categorized into three groups: those flanked by the same genes in Buchnera and the ancestor, those that occur within regions of synteny at positions where gene(s) are missing in Buchnera, and those that occur between syntenic fragments.
www.genomebiology.com /2001/2/12/RESEARCH/0054   (6311 words)

  
 Special Story:Symbiosis and Co-evolution-Mutual Connection among living things in the environment and on the time axis
Buchnera is concentrated in the 20 to 30 big cells called bacterium cells in the fatty tissue of an aphid.
When an aphid begins blastogenesis, a part of Buchnera in the bacterium cell of the mother aphid goes into the embryo in the early stage of development, thereby passing Buchnera into the aphid of the next generation.
Most genes of Buchnera that were lost were not necessary for working in an environment rich in materials and stable in a cell, but interestingly, some genes which are not related to a living environment, but are considered essential for maintaining cell identity, have been lost.
www.brh.co.jp /en/experience/journal/32/ss_6.html   (941 words)

  
 Structure and expression of the dnaKJ operon of Buchnera, an intracellular symbiotic bacteria of aphid.
Structure and expression of the dnaKJ operon of Buchnera, an intracellular symbiotic bacteria of aphid.
Buchnera sp., an intracellular symbiont of the pea aphid (Acyrthosiphon pisum Harris), is a close phylogenetical relative of Escherichia coli, and synthesizes a large amount of symbionin, a GroEL homolog.
Buchnera dnaK and dnaJ formed an operon whose transcription is governed by a promoter structurally homologous to heat shock promoters of E. coli, although the cellular amount of dnaKJ mRNA was not affected by heat shock.
www.ihop-net.org /UniPub/iHOP/gp/1161517.html   (261 words)

  
 BioMed Central | Full text | A dual-genome microarray for the pea aphid, Acyrthosiphon pisum, and its obligate ...
Buchnera inhabits specialized host cells called bacteriocytes, provides nutrients to the aphid and has co-speciated with its aphid hosts for the past 150 million years.
Buchnera, which has not been established in laboratory cultures, inhabits specialized host cells (bacteriocytes), is required for nutrition (host development, growth and reproduction) and has been strictly vertically transmitted from mother to offspring for the last 150 million years [2-5].
Buchnera occurs in large numbers within aphids; their genomes constitute about 5–10% of total DNA content [3].
www.biomedcentral.com /1471-2164/7/50   (4915 words)

  
 Evolution of symbiosis
By using microarrays to assess activity of A. pisum and Buchnera genes, the researchers discovered that after a four-hour exposure to 35 °C temperature, some of their laboratory strains of Buchnera upregulated the heat-shock genes, but others did not.
To answer that, the researchers asked whether exposing juvenile aphid hosts of Buchnera with either long or short promoters to four hours of high temperatures (35 or 38 °C) affected their ability to reproduce.
Yet, by sequencing and comparing the Buchnera associated with various A. pisum lines, the researchers discovered that the short-promoter option had arisen and been fixed twice in laboratory stock and was also found at frequencies of 21% and 13%, respectively, in bacteria in field-collected aphids from Wisconsin and New York.
www.eurekalert.org /pub_releases/2007-04/plos-eos040307.php   (672 words)

  
 Marine Biological Laboratory
As the bacteria have adapted to these relationships, known as obligate symbiosis, they have evolved highly streamlined genomes that are specialized to provide the host-beneficial functions necessary to support their symbiotic lifestyle.
Buchnera, for example, has lost many of the genes that encode cell membrane proteins.
They will also be comparing the Blochmannia genome to that of Buchnera, the bacterial symbiont of aphids, and Wigglesworthia, the symbiont of tsetse flies.
www.mbl.edu /publications/labnotes/2003/03_winter02.html   (1583 words)

  
 iBGD-integrated Buchnera Genome Database-
Buchnera belongs to the gamma-Proteobacteria, closely related to the Enterobacteriaceae family.
The mutualism between Buchnera and its host is so obligate that neither associant can independently reproduce.
Our analysis of the genome revealed the characteristic gene repertoire of Buchnera, which is quite different from those of free-living and parasitic bacteria.
buchnera.gsc.riken.go.jp   (150 words)

  
 Rickettsia Symbiont in the Pea Aphid Acyrthosiphon pisum: Novel Cellular Tropism, Effect on Host Fitness, and ...
Population dynamics of Rickettsia and Buchnera in the developmental course of the host aphid.
In the absence of Rickettsia, the population of Buchnera increased
aphid and the increased population density of Buchnera.
aem.asm.org /cgi/content/full/71/7/4069   (4402 words)

  
 Infotrieve Online
Buchnera inhabits specialized host cells called bacteriocytes, provides nutrients to the aphid and has co-speciated with its aphid hosts for the past 150 million years.
We have used a single microarray to examine gene expression in the pea aphid, Acyrthosiphon pisum, and its resident Buchnera.
Very little is known of gene expression in aphids, few studies have examined gene expression in Buchnera, and no study has examined simultaneously the expression profiles of a host and its symbiont.
www4.infotrieve.com /newmedline/detail.asp?NameID=16536873&Session=&searchQuery=Hemiptera&count=5012   (363 words)

  
 HAMAP: Buchnera aphidicola subsp. Schizaphis graminum complete proteome
Buchnera species are intracellular bacteria found in association with most aphids.
Buchnera are Gram-negative cells and are closely related to the Enterobacteriaceae family.
This strain is an endosymbiont of the aphid Schizaphis graminum.
www.expasy.ch /sprot/hamap/BUCAP.html   (201 words)

  
 Rickettsia symbiont in the pea aphid Acyrthosiphon pisum: novel cellular tropism, effect on host fitness, and ...   (Site not responding. Last check: )
In situ hybridization revealed that the Rickettsia symbiont was specifically localized in two types of host cells specialized for endosymbiosis: secondary mycetocytes and sheath cells.
Quantitative PCR analysis of the bacterial population dynamics identified a remarkable interaction between the coexisting symbionts: Buchnera population was significantly suppressed in the presence of Rickettsia, particularly at the young adult stage, when the aphid most actively reproduces.
On the basis of these results, we discussed the possible mechanisms that enable the prevalence of Rickettsia infection in natural host populations in spite of the negative fitness effects observed in the laboratory.
www.trophort.com /information/data/B03/S39/SAK05RIC4061493.html   (265 words)

  
 Reductive genome evolution in Buchnera aphidicola -- van Ham et al. 100 (2): 581 -- Proceedings of the National Academy ...
Reductive genome evolution in Buchnera aphidicola -- van Ham et al.
We have sequenced the genome of the intracellular symbiont Buchnera aphidicola from the aphid Baizongia pistacea.
Coexistence of Wolbachia with Buchnera aphidicola and a Secondary Symbiont in the Aphid Cinara cedri
www.pnas.org /cgi/lookup?vol=100&fp=581&view=abstract   (1448 words)

  
 Hundreds of Flagellar Basal Bodies Cover the Cell Surface of the Endosymbiotic Bacterium Buchnera aphidicola sp. Strain ...
Hundreds of Flagellar Basal Bodies Cover the Cell Surface of the Endosymbiotic Bacterium Buchnera aphidicola sp.
Buchnera aphidicola is the endosymbiotic bacterium of the pea
Although the Buchnera cell is nonmotile, it retains clusters
jb.asm.org /cgi/content/abstract/188/18/6539   (0 words)

  
 Plasmid-Encoded Anthranilate Synthase (TrpEG) in Buchnera aphidicola from Aphids of the Family Pemphigidae -- Van Ham ...
Plasmid-Encoded Anthranilate Synthase (TrpEG) in Buchnera aphidicola from Aphids of the Family Pemphigidae -- Van Ham et al.
Buchnera aphidicola is an obligate intracellular symbiont of aphids.
Gomez-Valero, L., Latorre, A., Silva, F. The Evolutionary Fate of Nonfunctional DNA in the Bacterial Endosymbiont Buchnera aphidicola.
aem.asm.org /cgi/content/abstract/65/1/117   (580 words)

  
 Even Bugs Get Bugged
Recently, researchers have discovered why Buchnera aphidcola is so important.
Buchnera aphidicola also needs the aphid to survive since it can not grow outside of the aphid's body.
Bacteria that are unable to grow outside of another larger organism and are beneficial to the larger organism are called endosymbionts.
www.suite101.com /article.cfm/microbiology/7270   (282 words)

  
 Genome sequence of the endocellular bacterial symbiont of aphids Buchnera sp. APS : Abstract : Nature
There are genes for the biosyntheses of amino acids essential for the hosts in the genome, but those for non-essential amino acids are missing, indicating complementarity and syntrophy between the host and the symbiont.
In addition, Buchnera lacks genes for the biosynthesis of cell-surface components, including lipopolysaccharides and phospholipids, regulator genes and genes involved in defence of the cell.
These results indicate that Buchnera is completely symbiotic and viable only in its limited niche, the bacteriocyte.
www.nature.com /doifinder/10.1038/35024074   (362 words)

  
 GeneQuiz - Analysis of Buchnera sp. genome   (Site not responding. Last check: )
Buchnera species are endosymbionts that reside in the bacteriocytes of aphids (Homoptera, Insecta).
They have lost the capability to synthesise cell-surface components, for which they entirely rely on the host cell factory, but provide in return most of the amino acids that are needed by the host.
The Buchnera chromosome is very small, around 640 kb compared with the 4 — 5 Mb of free-living related Enterobacteriaceae.
jura.ebi.ac.uk:8765 /ext-genequiz/genomes/bu0011/index.html   (339 words)

  
 How low can you go—again?
Buchnera aphidicola, an endosymbiont of the aphid Cinara cedri, has the smallest known genome size of its genus at approximately 422 kb with 362 genes.
This assumption is based on genomic comparisons between different Buchnera in many species of aphids.
The species selected for comparison are based on evolutionary trees of aphids and bacteria, and evolutionists’s beliefs about when the two became associated.
www.answersingenesis.org /docs2006/1108genome.asp   (1327 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal   (Site not responding. Last check: )
Among primary endosymbionts of insects, the best studied are the pea aphid (Acyrthosiphon pisum) and its endosymbiont Buchnera sp.
In some cases, the bacteria are transmitted in the egg, as in Buchnera; in others like Wigglesworthia, they are transmitted via milk to the developing insect embryo.
For example, the primary role of Buchnera is thought to be to synthesize essential amino acids that the aphid cannot acquire from its natural diet of plant sap.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=endosymbiont   (2153 words)

  
 Evolutionary harmony for stinkbugs and their gut bacteria: A perfect match
The researchers analyzed the DNA of the resident bacteria from four of the species and found that each bacterial species was associated with a different stinkbug species and fell into their own class of Proteobacteria, but were closely related to the well-characterized obligate endosymbiont (Buchnera aphidocola) of aphids.
And, like Buchnera, the gut endosymbionts also appear to have co-evolved with their host.
The authors found the same intriguing pattern of a small genome, a high percentage of A and T nucleotides in their DNA, and accelerated molecular evolution, thought to possibly result from population genetic forces--for example, small population size and bottlenecks.
www.eurekalert.org /pub_releases/2006-10/plos-ehf100306.php   (613 words)

  
 PLANTS Profile for Buchnera americana (American bluehearts) | USDA PLANTS
Buchnera americana L. Click on a thumbnail to view an image, or see all the Buchnera thumbnails at the PLANTS Gallery
Buchnera americana L. This plant is listed by the U.S. federal government or a state.
Buchnera americana L. View species account, photographs, and distribution from USF Atlas of Florida Vascular Plants.
plants.usda.gov /java/profile?symbol=BUAM   (221 words)

  
 Transcriptome analysis of the aphid bacteriocyte, the symbiotic host cell that harbors an endocellular mutualistic ...   (Site not responding. Last check: )
Buchnera may scarcely be able to regulate their own metabolic
In the bacteriocyte, Buchnera cells are encased in a membrane
of Buchnera (31, 32) or elimination of microbial intruders (35).
intl.pnas.org /cgi/content/full/102/15/5477   (3639 words)

  
 Growth Kinetics of the Endosymbiont Buchnera aphidicola in the Aphid Schizaphis graminum -- Baumann and Baumann 60 (9): ...
Growth Kinetics of the Endosymbiont Buchnera aphidicola in the Aphid Schizaphis graminum -- Baumann and Baumann 60 (9): 3440 -- Applied and Environmental Microbiology
Growth Kinetics of the Endosymbiont Buchnera aphidicola in the Aphid Schizaphis graminum
Van Ham, R. C. H. J., Martínez-Torres, D., Moya, A., Latorre, A. Plasmid-Encoded Anthranilate Synthase (TrpEG) in Buchnera aphidicola from Aphids of the Family Pemphigidae.
aem.asm.org /cgi/content/abstract/60/9/3440   (349 words)

  
 Buchnera Aphidcola   (Site not responding. Last check: )
Aphids have endosymbionts that provide an essential amino acid called tryptophan.
This endosymbiont is a bacteria called Buchnera aphidcola.
buchnera aphidcola • aphids • endosymbionts • tryptophan
www.suite101.com /reference/buchnera_aphidcola   (27 words)

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