Wikipedia

4,5-Dihydroxy-2,3-pentanedione

4,5-Dihydroxy-2,3-pentanedione (DPD) is an organic compound that occurs naturally but exists as several related structures. The idealized formula for this species is CH3C(O)C(O)CH(OH)CH2OH, but it is known to exist as several other forms resulting from cyclization. It is not stable at room temperature as a pure material, which has further complicated its analysis. The (S)-stereoisomer occurs naturally. It is typically hydrated, i.e., one keto group has added water to give the geminal diol.

4,5-Dihydroxy-2,3-pentanedione
Names
Preferred IUPAC name
4,5-Dihydroxypentane-2,3-dione
Other names
1-Deoxypento-2,4-diulose
1-Deoxypentosone
Dihydroxy-2,3-pentanedione
DPD
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
UNII
  • InChI=1S/C5H8O4/c1-3(7)5(9)4(8)2-6/h4,6,8H,2H2,1H3
    Key: UYTRITJAZOPLCZ-UHFFFAOYSA-N
  • CC(=O)C(=O)C(CO)O
Properties
C5H8O4
Molar mass 132.115 g·mol−1
Appearance Colorless
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

DPD is produced by degradation of S-adenosylhomocysteine by the action of the enzyme S-ribosylhomocysteinase.[1] The compound probably does not exist as depicted above, but as an equilibrium mixture of three hydrates.

Hydrated derivatives of dihydroxypentanedione.[2]

DPD reacts with boric acid to form a borate diester known as autoinducer-2 (AI-2). AI-2 is a signaling molecule used for bacterial quorum sensing. It is produced and recognized by many Gram-negative and Gram-positive bacteria.[3][4] AI-2 is synthesized by the reaction of DPD with boric acid[5] and is recognized by the two-component sensor kinase LuxPQ in Vibrionaceae.

References

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  1. ^ Jinge Zhu, Eric Dizin, Xubo Hu, Anne-Sophie Wavreille, Junguk Park, Dehua Pei "S-Ribosylhomocysteinase (LuxS) Is a Mononuclear Iron Protein" Biochemistry, 2003, volume 42, pp 4717–4726. doi:10.1021/bi034289j
  2. ^ Roberta J. Worthington and Christian Melander "Deconvoluting Interspecies Bacterial Communication" Angew. Chem. Int. Ed. 2012, volume 51, 6314 – 6315. doi:10.1002/anie.201202440
  3. ^ Miller, Stephen T.; Xavier, Karina B.; Campagna, Shawn R.; Taga, Michiko E.; Semmelhack, Martin F.; Bassler, Bonnie L.; Hughson, Frederick M. (2004). "Salmonella typhimurium Recognizes a Chemically Distinct Form of the Bacterial Quorum-Sensing Signal AI-2". Molecular Cell. 15 (5): 677–687. doi:10.1016/j.molcel.2004.07.020. PMID 15350213.
  4. ^ Miller, M. B.; Bassler, B. L. (2001). "Quorum sensing in bacteria". Annual Review of Microbiology. 55: 165–199. doi:10.1146/annurev.micro.55.1.165. PMID 11544353.
  5. ^ "Chemistry - Queen Mary University of London".
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