Evidence map›Paper›PMID 9260949›Full record

ArticleJournal of bacteriology1997

Tromp1, a putative rare outer membrane protein, is anchored by an uncleaved signal sequence to the Treponema pallidum cytoplasmic membrane.

D R Akins, E Robinson, D Shevchenko, C Elkins, D L Cox, J D Radolf

Open access · greenAbstract read
In one paragraph

Article in Journal of bacteriology, 1997. 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
3.0field-weighted citation impact, top 9% 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, 42 citations in OpenAlex.

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  14. Molecular basis of bacterial outer membrane permeability revisited.Microbiology and molecular biology reviews : MMBR · 2003
    Review
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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

6 authors at 1 institution in 1 country.

D R AkinsDepartment of Internal Medicine, University of Texas Southwestern Medical Center, Dallas 75235, USA.
E Robinson
D Shevchenko
C Elkins
D L Cox
J D Radolf
The University of Texas Southwestern Medical Center · US

Funding

Treponema pallidum Outer Membrane Proteins and Transition Metal AcquisitionR01AI026756 · NIAID · UNIVERSITY OF TEXAS SW MED CTR/DALLAS · PI RADOLF, JUSTIN D · 1992 to 2017
$5.1M
T.pallidum Membrane Immunogens and Anti-Oxidant DefenseR37AI026756 · NIAID · UNIVERSITY OF CONNECTICUT SCH OF MED/DNT · PI RADOLF, JUSTIN D · 2002 to 2006
$1.8M
MEMBRANE PROTEINS OF TREPONEMA PALLIDUMR29AI026756 · NIAID · UNIVERSITY OF TEXAS SW MED CTR/DALLAS · PI RADOLF, JUSTIN D. · 1988 to 1991
–
NIAID NIH HHS AI-26756
6 · The paper itself

Abstract

Treponema pallidum rare outer membrane protein 1 (Tromp1) has extensive sequence homology with substrate-binding proteins of ATP-binding cassette transporters. Because such proteins typically are periplasmic or cytoplasmic membrane associated, experiments were conducted to clarify Tromp1's physicochemical properties and cellular location in T. pallidum. Comparison of the sodium dodecyl sulfate-polyacrylamide gel electrophoresis mobilities of (i) native Tromp1 and Tromp1 synthesized by coupled in vitro transcription-translation and (ii) native Tromp1 and recombinant Tromp1 lacking the N-terminal signal sequence revealed that the native protein is not processed. Other studies demonstrated that recombinant Tromp1 lacks three basic porin-like properties: (i) the ability to form aqueous channels in liposomes which permit the influx of small hydrophilic solutes, (ii) an extensive beta-sheet secondary structure, and (iii) amphiphilicity. Subsurface localization of native Tromp1 was demonstrated by immunofluorescence analysis of treponemes encapsulated in gel microdroplets, while opsonization assays failed to detect surface-exposed Tromp1. Incubation of motile treponemes with 3-(trifluoromethyl)-3-(m-[125I]iodophenyl)-diazarine, a photoactivatable, lipophilic probe, also did not result in the detection of Tromp1 within the outer membranes of intact treponemes but, instead, resulted in the labeling of a basic 30.5-kDa presumptive outer membrane protein. Finally, analysis of fractionated treponemes revealed that native Tromp1 is associated predominantly with cell cylinders. These findings comprise a body of evidence that Tromp1 actually is anchored by an uncleaved signal sequence to the periplasmic face of the T. pallidum cytoplasmic membrane, where it likely subserves a transport-related function.

Indexed as

AzirinesBacterial ProteinsCell MembraneCross-Linking ReagentsElectrophoresis, Polyacrylamide GelFluorescent Antibody TechniqueLiposomesOpsonin ProteinsPorinsProtein Sorting SignalsProtein Structure, SecondaryRecombinant ProteinsTreponema pallidum3-(trifluoromethyl)-3-(3-iodophenyl)diazirineAzirinesBacterial ProteinsCross-Linking ReagentsLiposomesOpsonin ProteinsPorinsProtein Sorting SignalsRecombinant ProteinsTromp1 protein, Treponema pallidum

Identifiers

PMID9260949
PMCPMC179365
OpenAlexW1924557454

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.