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Attention Score in Context
| Title |
Measurements of Intra- and Extra-Cellular 5-Methyltetrahydrofolate Indicate that Bifidobacterium Adolescentis DSM 20083T and Bifidobacterium Pseudocatenulatum DSM 20438T Do Not Actively Excrete 5-Methyltetrahydrofolate In vitro
|
|---|---|
| Published in |
Frontiers in Microbiology, March 2017
|
| DOI | 10.3389/fmicb.2017.00445 |
| Pubmed ID | |
| Authors |
Markus Kopp, Kerstin Dürr, Matthias Steigleder, Thomas Clavel, Michael Rychlik |
| Abstract |
Certain intestinal bifidobacteria have the ability to synthesize folates. In vitro experiments revealed a high production, cellular accumulation, and release of reduced folate vitamers like 5-methyltetrahydrofolate and tetrahydrofolate in folate-free medium (FFM). However, it is still unclear to which extent synthesized folates are polyglutamylated and probably not available for transport, and if they are actively released by excretion. To address these questions, we characterized intra- and extra-cellular pteroylmonoglutamates and polyglutamylated 5-methyltetrahydrofolate (5-CH3-H4PteGlu2-4) in Bifidobacterium adolescentis DSM 20083(T) and Bifidobacterium pseudocatenulatum DSM 20438(T)in vitro. Folates were measured by means of stable isotope dilution assays (SIDA) coupled with LC-MS/MS analysis using [(2)H4]-5-methyltetrahydrofolic acid, [(2)H4]-tetrahydrofolic acid, and [(2)H4]-5-formyltetrahydrofolic acid as internal standards. Cell viability was examined by fluorescence microscopy. Quantitation of folate production by B. adolescentis during the stationary phase revealed a linear increase of dead cells paralleled by increasing concentration of 5-formyltetrahydrofolate and 5-methyltetrahydrofolate (100% 5-CH3-H4PteGlu4) in FFM, whereas the intracellular concentrations of these vitamers remained constant. After 24 h, B. adolescentis (125 mg cells, wet weight) produced a total amount of 0.846 nmol 5-CH3-H4folate: 0.385 ± 0.059 nmol (46 ± 7%) and 0.461 ± 0.095 nmol (54 ± 11%) measured in the intracellular (viable cells; 52 ± 3% measured by fluorescence microscopy) and extracellular (lysed cells; 48 ± 3%) fraction, respectively. For B. pseudocatenulatum (124 mg cells, wet weight), 1.135 nmol 5-CH3-H4folate was produced after 24 h, and a similar proportionality between intra- and extra-cellular folate concentrations and viable/lysed cells was observed. These results indicate that the strains tested produce and accumulate 5-CH3-H4PteGlu4 for cellular metabolism, and that extracellular concentrations of the vitamer arise from cell lysis. |
X Demographics
The data shown below were collected from the profiles of 3 X users who shared this research output. Click here to find out more about how the information was compiled.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 3 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 3 | 100% |
Mendeley readers
The data shown below were compiled from readership statistics for 21 Mendeley readers of this research output. Click here to see the associated Mendeley record.
Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Unknown | 21 | 100% |
Demographic breakdown
| Readers by professional status | Count | As % |
|---|---|---|
| Student > Master | 5 | 24% |
| Researcher | 4 | 19% |
| Student > Doctoral Student | 2 | 10% |
| Student > Bachelor | 2 | 10% |
| Professor | 1 | 5% |
| Other | 1 | 5% |
| Unknown | 6 | 29% |
| Readers by discipline | Count | As % |
|---|---|---|
| Agricultural and Biological Sciences | 5 | 24% |
| Biochemistry, Genetics and Molecular Biology | 3 | 14% |
| Immunology and Microbiology | 3 | 14% |
| Psychology | 1 | 5% |
| Medicine and Dentistry | 1 | 5% |
| Other | 2 | 10% |
| Unknown | 6 | 29% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 06 April 2017.
All research outputs
#17,489,487
of 25,654,806 outputs
Outputs from Frontiers in Microbiology
#17,880
of 29,651 outputs
Outputs of similar age
#207,851
of 323,697 outputs
Outputs of similar age from Frontiers in Microbiology
#336
of 472 outputs
Altmetric has tracked 25,654,806 research outputs across all sources so far. This one is in the 21st percentile – i.e., 21% of other outputs scored the same or lower than it.
So far Altmetric has tracked 29,651 research outputs from this source. They typically receive a little more attention than average, with a mean Attention Score of 6.4. This one is in the 33rd percentile – i.e., 33% of its peers scored the same or lower than it.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 323,697 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 27th percentile – i.e., 27% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 472 others from the same source and published within six weeks on either side of this one. This one is in the 21st percentile – i.e., 21% of its contemporaries scored the same or lower than it.