Skip to content

Reference

Evidence

CompoundsSubstances with curated findings
OutcomesMeasured endpoints
ProteinsTransporters and enzymes
InteractionsPairs that share biology
PapersEvery paper a finding cites
ArticlesReadings of the evidence

Chemistry

ReactionsRhea and Human-GEM, by subsystem
ReachWhat a compound can become

Reference layer

PathwaysReactions grouped under one name
ProcessesWhat proteins are annotated as doing
AnatomyTissues, by what is expressed there
Cell typesCells, by what is expressed there
OrganismsSpecies a compound is prepared from
MaterialsSubstances that are not one molecule
AssessmentsRegulatory determinations, transcribed
DiseasesFeatures, genes, and where each sits

Atlas Graph Twin Access

Search the graph

Reference

Evidence

Compounds
Outcomes
Proteins
Interactions
Papers
Articles

Chemistry

Reactions
Reach

Reference layer

Pathways
Processes
Anatomy
Cell types
Organisms
Materials
Assessments
Diseases

Atlas Graph Twin Access

Loading the page.

Catalyst

Computational infrastructure for human biology, built on a provenance-aware knowledge graph. Findings retain their sources; research and simulation are the next layers.

The graph

Compounds
Outcomes
Proteins
Atlas
Interactions
Papers
Articles
Graph
Search

Reference layer

Pathways
Processes
Anatomy
Cell types
Organisms
Materials
Assessments
Diseases
Reactions
Reach

How it works

Mission
Method
Twin
How to read the evidence
Sources and licences

Build on it

Access
In your assistant
For agents
Query the graph
Bulk export

A reference for what the literature reports. Not medical advice.

© 2026 CatalystPrivacy TermsReference data under the licences listed on the attribution page.

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine

362,296 routes · scope human · up to 3 steps · built 5 October 2026 · Reactions · API

Inferred

Every route here is a hypothesis drawn from reference reactions (Rhea and Human-GEM), not a finding. Currency species such as water, ATP and NAD(H) never form a step. Evidence key

24 compounds within 3 steps: 2 in 1, 9 in 2, 13 in 3

Does it reach a compound?

One step

ethanolamineReach from here →
1. 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
Catalysed by PTDSS2
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serineReach from here →
1. 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
Catalysed by PTDSS2

Two steps

acetaldehydeReach from here →
1. 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
2. ethanolamine ammonia-lyase (acetaldehyde-forming)
Catalysed by PTDSS2cytosol
O-phosphoethanolamineReach from here →
1. 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
2. ATP:ethanolamine O-phosphotransferase
Catalysed by PTDSS2, CHKA, ETNK1, ETNK2 and 1 morecytosol

Three steps

CHEBI:16132Reach from here →
Catalysed by PTDSS2, DERAcytosol
octadecanoateReach from here →

N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine

Reach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
fatty acylamide amidohydrolase

Catalysed by PTDSS2, FAAHcytosol

phosphoethanolamineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
ethanolamine + ATP = phosphoethanolamine + ADP + H(+)

Catalysed by PTDSS2, CHKA, ETNK1, ETNK2 and 1 more

1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-sn-glycero-3-phosphoserine + 1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enine

Catalysed by PTDSS2, PLA2G15

1-octadecanoyl-N-(acetyl)-sphing-4-enineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-N-(acetyl)-sphing-4-enine + 2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine

Catalysed by PTDSS2, PLA2G15

a 1-O-alkyl-sn-glycero-3-phosphoethanolamineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
a 1-O-alkyl-sn-glycero-3-phosphoethanolamine + H2O = a 1-O-alkyl-sn-glycero-3-phosphate + ethanolamine + H(+)

Catalysed by PTDSS2, ENPP2

2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-N-(acetyl)-sphing-4-enine + 2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine

Catalysed by PTDSS2, PLA2G15

1-octadecanoyl-sn-glycero-3-phosphoserineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-sn-glycero-3-phosphoserine + 1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enine

Catalysed by PTDSS2, PLA2G15

Catalysed by PTDSS2, PLA2G15, ABHD12

acetateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
ethanolamine ammonia-lyase (acetaldehyde-forming)
Acetaldehyde:NAD+ oxidoreductase

Catalysed by PTDSS2, ALDH3A1, ALDH3B1, ALDH1A3 and 1 morecytosolOne of 4 routes

(5Z,8Z,11Z,14Z)-eicosatetraenoateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
fatty acylamide amidohydrolase
N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine + H2O = ethanolamine + (5Z,8Z,11Z,14Z)-eicosatetraenoate

Catalysed by PTDSS2, FAAH, FAAH2cytosol

CDP-ethanolamineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
ATP:ethanolamine O-phosphotransferase
CTP:ethanolamine-phosphate cytidylyltransferase

Catalysed by PTDSS2, CHKA, ETNK1, ETNK2 and 2 morecytosolOne of 3 routes

sphinganine 1-phosphateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
ATP:ethanolamine O-phosphotransferase
Sphinganine-1-phosphate pamlmitaldehyde-lyase

Catalysed by PTDSS2, CHKA, ETNK1, ETNK2 and 2 morecytosol

a 1-O-alkyl-sn-glycero-3-phosphateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
a 1-O-alkyl-sn-glycero-3-phosphoethanolamine + H2O = a 1-O-alkyl-sn-glycero-3-phosphate + ethanolamine + H(+)
a 1-O-alkyl-sn-glycero-3-phosphoethanolamine + H2O = a 1-O-alkyl-sn-glycero-3-phosphate + ethanolamine + H(+)

Catalysed by PTDSS2, ENPP2

2-deoxy-D-ribose 5-phosphateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
ethanolamine ammonia-lyase (acetaldehyde-forming)
2-deoxy-D-ribose 5-phosphate = D-glyceraldehyde 3-phosphate + acetaldehyde

Catalysed by PTDSS2, DERAcytosol

sn-glycero-3-phospho-L-serineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-sn-glycero-3-phosphoserine + 1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enine
1-octadecanoyl-sn-glycero-3-phosphoserine + H2O = sn-glycero-3-phospho-L-serine + octadecanoate + H(+)

Catalysed by PTDSS2, PLA2G15, ABHD12

1-hexadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-N-(acetyl)-sphing-4-enine + 2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine
2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + hexadecanoyl-CoA = 1-hexadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + CoA

Catalysed by PTDSS2, PLA2G15, LPGAT1

2-[(5Z,8Z,11Z,14Z)-eicosatetraenoylamino]ethyl (9Z)-octadecenoateReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
fatty acylamide amidohydrolase
N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine + 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine = 2-[(5Z,8Z,11Z,14Z)-eicosatetraenoylamino]ethyl (9Z)-octadecenoate + (9Z-octadecenoyl)-sn-glycero-3-phosphocholine

Catalysed by PTDSS2, FAAH, PLA2G15cytosol

(9Z-octadecenoyl)-sn-glycero-3-phosphocholineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
fatty acylamide amidohydrolase
N-(5Z,8Z,11Z,14Z-eicosatetraenoyl)-ethanolamine + 1,2-di-(9Z-octadecenoyl)-sn-glycero-3-phosphocholine = 2-[(5Z,8Z,11Z,14Z)-eicosatetraenoylamino]ethyl (9Z)-octadecenoate + (9Z-octadecenoyl)-sn-glycero-3-phosphocholine

Catalysed by PTDSS2, FAAH, PLA2G15cytosol

1-octadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphoserineReach from here →

1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phosphoethanolamine + L-serine = 1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + ethanolamine
1-octadecanoyl-2-(9Z-octadecenoyl)-sn-glycero-3-phospho-L-serine + N-(acetyl)-sphing-4-enine = 1-octadecanoyl-sn-glycero-3-phosphoserine + 1-(9Z-octadecenoyl)-N-(acetyl)-sphing-4-enine
1-octadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphoserine + H2O = 1-octadecanoyl-sn-glycero-3-phosphoserine + (9Z,12Z)-octadecadienoate + H(+)

Catalysed by PTDSS2, PLA2G15, ABHD16A