Evidence map›Paper›PMID 18784071›Full record

ArticleThe Journal of biological chemistry2008

Crystal structure of human plasma platelet-activating factor acetylhydrolase: structural implication to lipoprotein binding and catalysis.

Uttamkumar Samanta, Brian J Bahnson

Open access · hybridAbstract read
In one paragraph

Article in The Journal of biological chemistry, 2008. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 27 papers.

0numbers the graph read from it
0cells of the map it votes in
27citing papers in PubMed
6.7field-weighted citation impact, top 3% 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

27 citing papers in PubMed, 82 citations in OpenAlex.

  1. Review
  2. Article
  3. Lipoprotein-associated phospholipase AProceedings of the National Academy of Sciences of the United States of America · 2022
    Article
  4. Review
  5. Article
  6. Review
  7. Review
  8. Article
  9. Article
  10. Review of four major distinct types of human phospholipase AAdvances in biological regulation · 2018
    Review
  11. Article
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  14. Review
  15. Article
  16. 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

2 authors at 1 institution in 1 country.

Uttamkumar SamantaDepartment of Chemistry & Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
Brian J Bahnson
University of Delaware · US

Funding

TOWARDS SOLID-STATE NMR STRUCTURES OF GPCRSP20RR015588 · NCRR · UNIVERSITY OF DELAWARE · PI LENHOFF, ABRAHAM M · 2000 to 2009
$18.2M
Case Center for Synchrotron BiosciencesP30EB009998 · NIBIB · CASE WESTERN RESERVE UNIVERSITY · PI CHANCE, MARK R · 2009 to 2018
$8.4M
Structure and Interfacial Function of Platelet Activating Factor AcetylhydrolaseR01HL084366 · NHLBI · UNIVERSITY OF DELAWARE · PI BAHNSON, BRIAN J · 2007 to 2011
$1.7M
NCRR NIH HHS 2P20RR015588NHLBI NIH HHS 1R01HL084366-A1NIBIB NIH HHS P30 EB009998
6 · The paper itself

Abstract

Human plasma platelet-activating factor (PAF) acetylhydrolase functions by reducing PAF levels as a general anti-inflammatory scavenger and is linked to anaphylactic shock, asthma, and allergic reactions. The enzyme has also been implicated in hydrolytic activities of other pro-inflammatory agents, such as sn-2 oxidatively fragmented phospholipids. This plasma enzyme is tightly bound to low and high density lipoprotein particles and is also referred to as lipoprotein-associated phospholipase A2. The crystal structure of this enzyme has been solved from x-ray diffraction data collected to a resolution of 1.5 angstroms. It has a classic lipase alpha/beta-hydrolase fold, and it contains a catalytic triad of Ser273, His351, and Asp296. Two clusters of hydrophobic residues define the probable interface-binding region, and a prediction is given of how the enzyme is bound to lipoproteins. Additionally, an acidic patch of 10 carboxylate residues and a neighboring basic patch of three residues are suggested to play a role in high density lipoprotein/low density lipoprotein partitioning. A crystal structure is also presented of PAF acetylhydrolase reacted with the organophosphate compound paraoxon via its active site Ser273. The resulting diethyl phosphoryl complex was used to model the tetrahedral intermediate of the substrate PAF to the active site. The model of interface binding begins to explain the known specificity of lipoprotein-bound substrates and how the active site can be both close to the hydrophobic-hydrophilic interface and at the same time be accessible to the aqueous phase.

Indexed as

1-Alkyl-2-acetylglycerophosphocholine EsteraseBiocatalysisCrystallography, X-RayHumansLipoproteinsModels, MolecularPlatelet Activating FactorProtein BindingProtein Structure, QuaternaryProtein Structure, TertiaryProtein SubunitsSubstrate Specificity1-Alkyl-2-acetylglycerophosphocholine EsteraseLipoproteinsPlatelet Activating FactorProtein Subunits

Identifiers

PMID18784071
PMCPMC2581546
OpenAlexW2085771150

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.