Evidence map›Paper›PMID 9321413›Full record

ArticleJournal of molecular evolution1997

Substrate-directed formation of small biocatalysts under prebiotic conditions.

E Kochavi, A Bar-Nun, G Fleminger

Abstract read
PubMed Publisher
In one paragraph

Article in Journal of molecular evolution, 1997. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.

0numbers the graph read from it
0cells of the map it votes in
7citing papers in PubMed
–field-weighted citation impact
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

7 citing papers in PubMed.

  1. Review
  2. Article
  3. Article
  4. Emergence of self-reproduction in cooperative chemical evolution of prebiological molecules.Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life · 2011
    Article
  5. Steps towards the formation of a protocell: the possible role of short peptides.Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life · 2007
    Article
  6. The structure and synthetic capabilities of a catalytic peptide formed by substrate-directed mechanism--implications to prebiotic catalysis.Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life · 2005
    Article
  7. ISSOL '02. Abstracts of the 13th International Conference on the Origin of Life. Oaxaca, Mexico, June 30-July 5, 2002.Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life · 2002
    Article
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

3 authors.

E KochaviDepartment of Geophysics and Planetary Sciences, Tel Aviv University, Israel.
A Bar-Nun
G Fleminger

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

One of the most debated issues concerning the origin of life, is how enzymes which are essential for existence of any living organism, evolved. It is clear that, regardless of the exact mechanism, the process should have been specific and reproducible, involving interactions between different molecules. We propose that substrate templating played a crucial role in maintaining reproducible and specific formation of prebiotic catalysts. This work demonstrates experimentally, for the first time, substrate-directed formation of an oligopeptide that possesses a specific catalytic activity toward the substrate on which it was formed. In our experiments we used the substrate O-nitrophenol-beta-D-galactopyranoside (ONPG) as a molecular template for the synthesis of a specific catalyst that is capable of cleaving the same substrate. This was achieved by incubation of the substrate with free amino acids and a condensing agent (dicyandiamide) at elevated temperatures. A linear increase with time of the reaction rate (d[product]/d2t), pointed to an acceleration regime, where the substrate generates the formation of the catalyst. The purified catalyst, produced by a substrate-directed mechanism, was analyzed, and identified as Cys2-Fe+2. The mechanism of substrate-directed formation of prebiotic catalysts provides a solution to both the specificity and the reproducibility requirements from any prebiotic system which should evolve into the biological world.

Indexed as

Origin of LifeAmino AcidsAnaerobiosisBinding SitesCatalysisCysteineEnzymesModels, BiologicalMolecular StructureNitrophenylgalactosidesOligopeptidesStereoisomerismSubstrate Specificity2-nitrophenylgalactosideAmino AcidsCysteineEnzymesNitrophenylgalactosidesOligopeptides

Identifiers

PMID9321413

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.