Evidence map›Paper›PMID 8942980›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America1996

Sucrose biosynthesis in a prokaryotic organism: Presence of two sucrose-phosphate synthases in Anabaena with remarkable differences compared with the plant enzymes.

A C Porchia, G L Salerno

Open access · greenAbstract readComparative Study
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 1996. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.

0numbers the graph read from it
0cells of the map it votes in
26citing papers in PubMed
4.4field-weighted citation impact, top 6% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

26 citing papers in PubMed, 83 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors.

A C PorchiaCentro de Investigaciones Biológicas, Fundación para Investigaciones Biológicas Aplicadas, ProBiop (Conlcet), Mar del Plata, Argentina.
G L Salerno

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Biosynthesis of sucrose-6-P catalyzed by sucrose-phosphate synthase (SPS), and the presence of sucrose-phosphate phosphatase (SPP) leading to the formation of sucrose, have both been ascertained in a prokaryotic organism: Anabaena 7119, a filamentous heterocystic cyanobacterium. Two SPS activities (SPS-I and SPS-II) were isolated by ion-exchange chromatography and partially purified. Four remarkable differences between SPSs from Anabaena and those from higher plants were shown: substrate specificity, effect of divalent cations, native molecular mass, and oligomeric composition. Both SPS-I and SPS-II accept Fru-6-P (K(m) for SPS-I = 0.8 +/- 0.1 mM; K(m) for SPS-II = 0.7 +/- 0.1 mM) and UDP-Glc as substrates (K(m) for SPS-I = 1.3 +/- 0.4 mM; K(m) for SPS-II = 4.6 +/- 0.4 mM), but unlike higher plant enzymes, they are not specific for UDP-Glc. GDP-Glc and TDP-Glc are also SPS-I substrates (K(m) for GDP-Glc = 1.2 +/- 0.2 mM and K(m) for TDP-Glc = 4.0 +/- 0.4 mM), and ADP-Glc is used by SPS-II (K(m) for ADP-Glc = 5.7 +/- 0.7 mM). SPS-I has an absolute dependence toward divalent metal ions (Mg2+ or Mn2+) for catalytic activity, not found in plants. A strikingly smaller native molecular mass (between 45 and 47 kDa) was determined by gel filtration for both SPSs, which, when submitted to SDS/PAGE, showed a monomeric composition. Cyanobacteria are, as far as the authors know, the most primitive organisms that are able to biosynthesize sucrose as higher plants do.

Indexed as

AnabaenaCations, DivalentChromatography, GelChromatography, Ion ExchangeGlucosyltransferasesIsoenzymesKineticsMacromolecular SubstancesMolecular WeightPlantsSubstrate SpecificitySucroseCations, DivalentGlucosyltransferasesIsoenzymesMacromolecular SubstancesSucrosesucrose-phosphate synthase

Identifiers

PMID8942980
PMCPMC19363
OpenAlexW2062676258

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.