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Record Information
Version5.0
StatusExpected but not Quantified
Creation Date2021-09-24 12:27:43 UTC
Update Date2022-07-12 15:36:35 UTC
HMDB IDHMDB0304793
Secondary Accession NumbersNone
Metabolite Identification
Common Name4-Oxoproline
Description4-oxoproline belongs to the class of organic compounds known as proline and derivatives. Proline and derivatives are compounds containing proline or a derivative thereof resulting from reaction of proline at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom. 4-oxoproline is a substrate for the enzyme known as 4-oxoproline reductase. This enzyme converts 4-oxoproline (using NADH and a hydrogen ion) to cis-4-hydroxyproline. In 2022 the enzyme 4-oxo-L-proline reductase was identified as 3-hydroxybutyrate dehydrogenase 2 (BDH2) (PMID: 35150746 ).  4-oxoproline has been identified in human blood as reported by (PMID: 31557052 ). 4-Oxoproline is a poorly studied analog of L-proline. The only known natural compound containing a 4-oxoproline moiety is the antibiotic X-type actinomycin produced by Streptomyces antibioticus. Nevertheless, 4-oxoproline has been detected occasionally in various biological samples, including extracts of human embryonic kidney 293T (HEK293T) cells and the blood samples of type 2 diabetes patients treated with metformin, sulphonylurea, or both drugs combined (PMID: 35150746 ).
Structure
Thumb
Synonyms
ValueSource
4-Oxoprolinic acidGenerator
4-Ketoproline, (L)-isomerMeSH
4-KetoprolineMeSH
4-oxo-L-ProlineMeSH
Chemical FormulaC5H6NO3
Average Molecular Weight128.108
Monoisotopic Molecular Weight128.035316637
IUPAC Name4-oxopyrrolidine-2-carboxylate
Traditional Name4-oxoprolinate
CAS Registry NumberNot Available
SMILES
[O-]C(=O)C1CC(=O)CN1
InChI Identifier
InChI=1S/C5H7NO3/c7-3-1-4(5(8)9)6-2-3/h4,6H,1-2H2,(H,8,9)/p-1
InChI KeyHFXAFXVXPMUQCQ-UHFFFAOYSA-M
Chemical Taxonomy
Description Belongs to the class of organic compounds known as proline and derivatives. Proline and derivatives are compounds containing proline or a derivative thereof resulting from reaction of proline at the amino group or the carboxy group, or from the replacement of any hydrogen of glycine by a heteroatom.
KingdomOrganic compounds
Super ClassOrganic acids and derivatives
ClassCarboxylic acids and derivatives
Sub ClassAmino acids, peptides, and analogues
Direct ParentProline and derivatives
Alternative Parents
Substituents
  • Proline or derivatives
  • Alpha-amino acid
  • Oxoproline
  • Pyrrolidine carboxylic acid
  • Pyrrolidine carboxylic acid or derivatives
  • Pyrrolidone
  • 3-pyrrolidone
  • Pyrrolidine
  • Ketone
  • Amino acid
  • Cyclic ketone
  • Carboxylic acid
  • Secondary aliphatic amine
  • Monocarboxylic acid or derivatives
  • Azacycle
  • Organoheterocyclic compound
  • Secondary amine
  • Organopnictogen compound
  • Organooxygen compound
  • Organonitrogen compound
  • Amine
  • Organic oxygen compound
  • Organic oxide
  • Hydrocarbon derivative
  • Carbonyl group
  • Organic nitrogen compound
  • Organic anion
  • Aliphatic heteromonocyclic compound
Molecular FrameworkAliphatic heteromonocyclic compounds
External Descriptors
Ontology
Not AvailableNot Available
Physical Properties
StateNot Available
Experimental Molecular Properties
PropertyValueReference
Melting PointNot AvailableNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Experimental Chromatographic PropertiesNot Available
Predicted Molecular Properties
PropertyValueSource
logP-1.3ALOGPS
logP-3.1ChemAxon
logS0.49ALOGPS
pKa (Strongest Acidic)2.48ChemAxon
pKa (Strongest Basic)6.8ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count4ChemAxon
Hydrogen Donor Count1ChemAxon
Polar Surface Area69.23 ŲChemAxon
Rotatable Bond Count1ChemAxon
Refractivity39.14 m³·mol⁻¹ChemAxon
Polarizability11.19 ųChemAxon
Number of Rings1ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
Predicted Chromatographic Properties

Predicted Collision Cross Sections

PredictorAdduct TypeCCS Value (Å2)Reference
AllCCS[M+H]+126.99532859911
AllCCS[M+H-H2O]+122.28132859911
AllCCS[M+Na]+132.66532859911
AllCCS[M+NH4]+131.39532859911
AllCCS[M-H]-118.6532859911
AllCCS[M+Na-2H]-120.57432859911
AllCCS[M+HCOO]-122.73132859911
DeepCCS[M+H]+122.20730932474
DeepCCS[M-H]-119.16730932474
DeepCCS[M-2H]-155.97830932474
DeepCCS[M+Na]+131.37630932474

Predicted Kovats Retention Indices

Derivatized

Derivative Name / StructureSMILESKovats RI ValueColumn TypeReference
4-Oxoproline,1TMS,isomer #1C[Si](C)(C)OC1=CNC(C(=O)[O-])C11467.9Semi standard non polar33892256
4-Oxoproline,1TMS,isomer #1C[Si](C)(C)OC1=CNC(C(=O)[O-])C11399.8Standard non polar33892256
4-Oxoproline,1TMS,isomer #1C[Si](C)(C)OC1=CNC(C(=O)[O-])C12310.5Standard polar33892256
4-Oxoproline,1TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])NC11365.0Semi standard non polar33892256
4-Oxoproline,1TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])NC11362.2Standard non polar33892256
4-Oxoproline,1TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])NC12138.9Standard polar33892256
4-Oxoproline,1TMS,isomer #3C[Si](C)(C)N1CC(=O)CC1C(=O)[O-]1307.4Semi standard non polar33892256
4-Oxoproline,1TMS,isomer #3C[Si](C)(C)N1CC(=O)CC1C(=O)[O-]1340.0Standard non polar33892256
4-Oxoproline,1TMS,isomer #3C[Si](C)(C)N1CC(=O)CC1C(=O)[O-]1829.1Standard polar33892256
4-Oxoproline,2TMS,isomer #1C[Si](C)(C)OC1=CN([Si](C)(C)C)C(C(=O)[O-])C11508.7Semi standard non polar33892256
4-Oxoproline,2TMS,isomer #1C[Si](C)(C)OC1=CN([Si](C)(C)C)C(C(=O)[O-])C11483.6Standard non polar33892256
4-Oxoproline,2TMS,isomer #1C[Si](C)(C)OC1=CN([Si](C)(C)C)C(C(=O)[O-])C11788.1Standard polar33892256
4-Oxoproline,2TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C)C11445.0Semi standard non polar33892256
4-Oxoproline,2TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C)C11447.9Standard non polar33892256
4-Oxoproline,2TMS,isomer #2C[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C)C11739.0Standard polar33892256
4-Oxoproline,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CNC(C(=O)[O-])C11688.5Semi standard non polar33892256
4-Oxoproline,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CNC(C(=O)[O-])C11613.7Standard non polar33892256
4-Oxoproline,1TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CNC(C(=O)[O-])C12397.5Standard polar33892256
4-Oxoproline,1TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])NC11580.7Semi standard non polar33892256
4-Oxoproline,1TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])NC11578.1Standard non polar33892256
4-Oxoproline,1TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])NC12264.8Standard polar33892256
4-Oxoproline,1TBDMS,isomer #3CC(C)(C)[Si](C)(C)N1CC(=O)CC1C(=O)[O-]1585.2Semi standard non polar33892256
4-Oxoproline,1TBDMS,isomer #3CC(C)(C)[Si](C)(C)N1CC(=O)CC1C(=O)[O-]1612.9Standard non polar33892256
4-Oxoproline,1TBDMS,isomer #3CC(C)(C)[Si](C)(C)N1CC(=O)CC1C(=O)[O-]2014.9Standard polar33892256
4-Oxoproline,2TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CN([Si](C)(C)C(C)(C)C)C(C(=O)[O-])C11944.5Semi standard non polar33892256
4-Oxoproline,2TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CN([Si](C)(C)C(C)(C)C)C(C(=O)[O-])C11890.0Standard non polar33892256
4-Oxoproline,2TBDMS,isomer #1CC(C)(C)[Si](C)(C)OC1=CN([Si](C)(C)C(C)(C)C)C(C(=O)[O-])C12024.8Standard polar33892256
4-Oxoproline,2TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C(C)(C)C)C11882.3Semi standard non polar33892256
4-Oxoproline,2TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C(C)(C)C)C11855.7Standard non polar33892256
4-Oxoproline,2TBDMS,isomer #2CC(C)(C)[Si](C)(C)OC1=CC(C(=O)[O-])N([Si](C)(C)C(C)(C)C)C11996.2Standard polar33892256
Spectra

MS/MS Spectra

Spectrum TypeDescriptionSplash KeyDeposition DateSourceView
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 4-Oxoproline 10V, Negative-QTOFsplash10-004i-2900000000-99759b8bcfd5f4cc599e2019-02-23Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 4-Oxoproline 20V, Negative-QTOFsplash10-0040-9600000000-1a9b290df54f0a6cfb2f2019-02-23Wishart LabView Spectrum
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 4-Oxoproline 40V, Negative-QTOFsplash10-0zgl-9000000000-eb3c88591d1ffcdaa5342019-02-23Wishart LabView Spectrum
Biological Properties
Cellular LocationsNot Available
Biospecimen LocationsNot Available
Tissue LocationsNot Available
Pathways
Normal Concentrations
Not Available
Abnormal Concentrations
Not Available
Associated Disorders and Diseases
Disease ReferencesNone
Associated OMIM IDsNone
DrugBank IDNot Available
Phenol Explorer Compound IDNot Available
FooDB IDFDB098374
KNApSAcK IDNot Available
Chemspider ID26331290
KEGG Compound IDNot Available
BioCyc IDNot Available
BiGG IDNot Available
Wikipedia LinkNot Available
METLIN IDNot Available
PubChem CompoundNot Available
PDB IDNot Available
ChEBI ID58670
Food Biomarker OntologyNot Available
VMH IDNot Available
MarkerDB IDNot Available
Good Scents IDNot Available
References
Synthesis ReferenceNot Available
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Kwiatkowski S, Bozko M, Zarod M, Witecka A, Kocdemir K, Jagielski AK, Drozak J: Recharacterization of the mammalian cytosolic type 2 (R)-beta-hydroxybutyrate dehydrogenase as 4-oxo-l-proline reductase (EC 1.1.1.104). J Biol Chem. 2022 Mar;298(3):101708. doi: 10.1016/j.jbc.2022.101708. Epub 2022 Feb 10. [PubMed:35150746 ]