Jump to: navigation, search
CAS number 1981-49-3
PubChem 683
Molecular formula C3H8O10P2
Molar mass 266.037
Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

WikiDoc Resources for 1,3-Bisphosphoglycerate


Most recent articles on 1,3-Bisphosphoglycerate

Most cited articles on 1,3-Bisphosphoglycerate

Review articles on 1,3-Bisphosphoglycerate

Articles on 1,3-Bisphosphoglycerate in N Eng J Med, Lancet, BMJ


Powerpoint slides on 1,3-Bisphosphoglycerate

Images of 1,3-Bisphosphoglycerate

Photos of 1,3-Bisphosphoglycerate

Podcasts & MP3s on 1,3-Bisphosphoglycerate

Videos on 1,3-Bisphosphoglycerate

Evidence Based Medicine

Cochrane Collaboration on 1,3-Bisphosphoglycerate

Bandolier on 1,3-Bisphosphoglycerate

TRIP on 1,3-Bisphosphoglycerate

Clinical Trials

Ongoing Trials on 1,3-Bisphosphoglycerate at Clinical Trials.gov

Trial results on 1,3-Bisphosphoglycerate

Clinical Trials on 1,3-Bisphosphoglycerate at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on 1,3-Bisphosphoglycerate

NICE Guidance on 1,3-Bisphosphoglycerate


FDA on 1,3-Bisphosphoglycerate

CDC on 1,3-Bisphosphoglycerate


Books on 1,3-Bisphosphoglycerate


1,3-Bisphosphoglycerate in the news

Be alerted to news on 1,3-Bisphosphoglycerate

News trends on 1,3-Bisphosphoglycerate


Blogs on 1,3-Bisphosphoglycerate


Definitions of 1,3-Bisphosphoglycerate

Patient Resources / Community

Patient resources on 1,3-Bisphosphoglycerate

Discussion groups on 1,3-Bisphosphoglycerate

Patient Handouts on 1,3-Bisphosphoglycerate

Directions to Hospitals Treating 1,3-Bisphosphoglycerate

Risk calculators and risk factors for 1,3-Bisphosphoglycerate

Healthcare Provider Resources

Symptoms of 1,3-Bisphosphoglycerate

Causes & Risk Factors for 1,3-Bisphosphoglycerate

Diagnostic studies for 1,3-Bisphosphoglycerate

Treatment of 1,3-Bisphosphoglycerate

Continuing Medical Education (CME)

CME Programs on 1,3-Bisphosphoglycerate


1,3-Bisphosphoglycerate en Espanol

1,3-Bisphosphoglycerate en Francais


1,3-Bisphosphoglycerate in the Marketplace

Patents on 1,3-Bisphosphoglycerate

Experimental / Informatics

List of terms related to 1,3-Bisphosphoglycerate

1,3-Bisphosphoglycerate (1,3BPG), also known as PGAP, is a 3-carbon organic molecule present in most, if not all, living organisms. It primarily exists as a metabolic intermediate in both glycolysis during respiration and the Calvin cycle during photosynthesis. 1,3BPG is a transitional stage between glycerate 3-phosphate and glyceraldehyde 3-phosphate during the fixation/reduction of CO2. 1,3BPG is also a precursor to 2,3-bisphosphoglycerate which in turn is a reaction intermediate in the glycolytic pathway.

Biological structure and role

1,3-bisphosphoglycerate is the anion form of bisphosphoglyceric acid. It is phosphorylated at the number 1 and 3 carbons. The result of this phosphorylation gives 1,3BPG important biological properties such as the ability to phosphorylate ADP to form the energy storage molecule ATP.

In glycolysis

D-glyceraldehyde 3-phosphate glyceraldehyde phosphate dehydrogenase 1,3-bisphospho-D-glycerate 3-phosphoglycerate kinase 3-phospho-D-glycerate
D-glyceraldehyde-3-phosphate wpmp.png   1,3-bisphospho-D-glycerate wpmp.png   3-phospho-D-glycerate wpmp.png
Biochem reaction arrow reversible YYYY horiz med.png Biochem reaction arrow reversible YYYY horiz med.png
  glyceraldehyde phosphate dehydrogenase   3-phosphoglycerate kinase

As previously mentioned 1,3BPG is a metabolic intermediate in the glycolytic pathway. It is created by the exergonic oxidation of the aldehyde in G3P. The result of this oxidation is the conversion of the aldehyde group into a carboxylic acid group which drives the formation of an acyl phosphate bond. This is incidentally the only step in the glycoyltic pathway in which NAD+ is converted into NADH. The formation reaction of 1,3BPG requires the presence of an enzyme called glyceraldehyde-3-phosphate dehydrogenase.

The high energy acyl phosphate bond of 1,3BPG is important in respiration as it assists in the formation of ATP. The molecule of ATP created during the following reaction is the first molecule produced during respiration. The reaction occurs as follows;

1,3-bisphosphoglycerate + ADP 3-phosphoglycerate + ATP

The transfer of an inorganic phosphate from the carboxyl group on 1,3BPG to ADP to form ATP is reversible due to a low ΔG. This is as a result of one acyl phosphate bond being cleaved whilst another is created. This reaction is not naturally spontaneous and requires the presence of a catalyst. This role is performed by the enzyme phosphoglycerate kinase. During the reaction phosphoglycerate kinase undergoes a substrate induced conformational change similar to another metabolic enzyme called hexokinase.

Because two molecules of glyceraldhye-3-phosphate are formed during glycolysis from one molecule of glucose, 1,3BPG can be said to responsible for two of the ten molecules of ATP produced during the entire process. Glycolysis also uses two molecules of ATP in its initial stages as a committed and irreversible step. For this reason glycolysis is not reversible and has a net produce of 2 molecules of ATP and two of NADH. The two molecules of NADH themselves go on to produce approximately 3 molecules of ATP each.

In the calvin cycle

1,3-BPG has a very similar role in the Calvin cycle to its role in the glycolytic pathway, for this reason both reactions are said to be analogous. However the reaction pathway is effectively reversed. The only other major difference between the two reactions is that NADPH is used as an electron donor in the calvin cycle whilst NAD+ is used as an electron acceptor in glycolysis. In this reaction cycle 1,3BPG originates from 3-phosphoglycerate and is made into glyceraldehyde 3-phosphate by the action of specific enzymes.

Contrary to the similar reactions of the glycolytic pathway, 1,3BPG in the calvin cycle does not produce ATP but instead uses it. For this reason it can be considered to be an irreversible and committed step in the cycle. The outcome of this section of the cycle is an inorganic phosphate is removed from 1,3BPG and used to provide energy for the donation of electrons from NADPH into the reaction cycle, forming NADP+.

In complete reverse of the glycolytic pathway reaction, the enzyme phosphoglycerate kinase catalyses the reduction of the carboxyl group of 1,3BPG to form an aldehyde instead. This reaction also releases an inorganic phosphate molecule which is subsequently used as energy for the donation of electrons from the conversion of NADPH to NADP+. Overseeing this latter stage of the reaction is the enzyme glyceraldehyde-phosphate dehydrogenase.

Medical significance of 1,3BPG

During normal metabolism in humans approximately 20% of the 1,3BPG produced does not go any further in the glycolytic pathway. It is instead shunted through an alternate pathway involving the reduction of ATP in the erythrocytes. During this alternate pathway it is made into a similar molecule called 2,3-Bisphoshoglycerate. 2,3BPG is used as a mechanism to oversee the efficient release of oxygen from hemoglobin. Levels of this 1,3BPG will raise in a patients blood when oxygen levels are low as this is one of the mechanisms of acclimatization. Low oxygen levels trigger a rise in 1,3BPG levels which in turn raises the level of 2,3BPG which alters the efficiency of oxygen dissociation from hemoglobin. This constitutes a negative feedback relationship.

See also

 v  d  e 
Glycolysis Metabolic Pathway
Glucose Hexokinase Glucose-6-phosphate Phosphoglucoisomerase Fructose 6-phosphate Phosphofructokinase Fructose 1,6-bisphosphate Fructose bisphosphate aldolase Dihydroxyacetone phosphate Glyceraldehyde 3-phosphate Triosephosphate isomerase Glyceraldehyde 3-phosphate Glyceraldehyde phosphate dehydrogenase
D-glucose wpmp.png ATP ADP Alpha-D-glucose-6-phosphate wpmp.png Beta-D-fructose-6-phosphate wpmp.png ATP ADP Beta-D-fructose-1,6-bisphosphate wpmp.png Glycerone-phosphate wpmp.png D-glyceraldehyde-3-phosphate wpmp.png D-glyceraldehyde-3-phosphate wpmp.png NAD+ + Pi NADH + H+
Biochem reaction arrow foward YYNN horiz med.png Biochem reaction arrow reversible NNNN horiz med.png Biochem reaction arrow foward YYNN horiz med.png Biochem reaction arrow reversible NNNN horiz med.png + Biochem reaction arrow reversible NNNN horiz med.png 2 Biochem reaction arrow reversible YYYY horiz med.png
NAD+ + Pi NADH + H+
1,3-Bisphosphoglycerate Phosphoglycerate kinase 3-Phosphoglycerate Phosphoglycerate mutase 2-Phosphoglycerate Enolase Phosphoenolpyruvate Pyruvate kinase Pyruvate Pyruvate dehydrogenase Acetyl-CoA
1,3-bisphospho-D-glycerate wpmp.png ADP ATP 3-phospho-D-glycerate wpmp.png 2-phospho-D-glycerate wpmp.png H2O Phosphoenolpyruvate wpmp.png ADP ATP Pyruvate wpmp.png CoA + NAD+ NADH + H+ + CO2 Acetyl co-A wpmp.png
2 Biochem reaction arrow reversible YYYY horiz med.png 2 Biochem reaction arrow reversible NNNN horiz med.png 2 Biochem reaction arrow reversible NYYN horiz med.png 2 Biochem reaction arrow foward YYNN horiz med.png 2 Biochem reaction arrow foward YYNN horiz med.png 2


  • Stryer et al. Biochemistry 5th Edition. WH Freeman & Co Ltd , 2002. ISBN 0-7167-4684-0
  • Alberts et al. Molecular Biology of the Cell. Garland Science, 2001. ISBN 0-8153-4072-9
  • Germann, W. Principles of Human Physiology. Addison Wesley, 2004. ISBN 0-321-24862-7

External links