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Inhibition of Escherichia coli porphobilinogen synthase using analogs of postulated intermediates
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Background Porphobilinogen synthase is the second enzyme involved in the biosynthesis of natural tetrapyrrolic compounds, and condenses two molecules of 5-aminolevulinic acid (ALA) through a nonsymmetrical pathway to form porphobilinogen. Each substrate is recognized individually at two different active site positions to be regioselectively introduced into the product. According to pulse-labeling experiments, the substrate forming the propionic acid sidechain of porphobilinogen is recognized first. Two different mechanisms for the first bond-forming step between the two substrates have been proposed. The first involves carbon-carbon bond formation (an aldol-type reaction) and the second carbon-nitrogen bond formation, leading to an iminium ion. Results With the help of kinetic studies, we determined the Michaelis constants for each substrate recognition site. These results explain the Michaelis-Menten behavior of substrate analog inhibitors - they act as competitive inhibitors. Under standard conditions, however, another set of inhibitors demonstrates uncompetitive, mixed, pure irreversible, slow-binding or even quasi-irreversible inhibition behavior. Conclusions Analysis of the different classes of inhibition behavior allowed us to make a correlation between the type of inhibition and a specific site of interaction. Analyzing the inhibition behavior of analogs of postulated intermediates strongly suggests that carbon-nitrogen bond formation occurs first.
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“After being synthesized ALA reaches cytosol, where it undergoes a condensation reaction. The reaction occurs between two ALA molecules with the aid of zinc-dependent enzyme – aminolevulinate dehydratase (ALAD) – and leads to the formation of porphobilinogen (PBG).”
From Aminolevulinic Acid (ALA) as a Prodrug in Photodynamic Therapy of Cancer (2011) · cites this paper as [14]
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“Two molecules of ALA bind non-symmetrically to the active site, finally leading to the synthesis of PBG [14].”
From Aminolevulinic Acid (ALA) as a Prodrug in Photodynamic Therapy of Cancer (2011) · cites this paper as [14]
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Metadata
- Authors
- Jarret, C., Stauffer, F., Henz, M. E., Marty, M., Lüönd, R. M., Bobálová, J., Schürmann, P., & Neier, R.
- Affiliations
- University of Neuchâtel (CH)
- Corresponding author
- Neier, Reinhard
- Venue
- Chemistry & Biology
- Publisher
- Elsevier BV
- Published
- 2000-03
- Volume
- 7
- Issue
- 3
- Pages
- 185-196
- ISSN
- 1074-5521 (ISSN-L)
- OpenAlex
- W2043638626
- Cited by
- 26
- References
- 60
- Citations by year
- 2021: 1 · 2017: 1 · 2015: 2 · 2012: 2
- FWCI
- 0.60
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Chemistry & Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
- Physical Sciences › Materials Science › Materials Chemistry › Porphyrin and Phthalocyanine Chemistry
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
- Keywords
- delta-aminolevulinic acid dehydratase, Escherichia coli, 5-aminolevulinic acid, tetrapyrrole biosynthesis, substrate analog inhibitors, enzyme inhibition kinetics, Michaelis-Menten kinetics, competitive inhibition, uncompetitive inhibition, mixed-type inhibition, irreversible inhibition, slow-binding inhibition, C–N bond formation, iminium ion intermediate, substrate recognition site, regioselectivity
- MeSH terms
- Aminolevulinic Acid, Porphobilinogen Synthase, Binding, Competitive, Dicarboxylic Acids, Enzyme Inhibitors, Escherichia coli, Kinetics, Models, Chemical, Porphobilinogen, Structure-Activity Relationship, Substrate Specificity, Catalytic Domain
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- Jarret, C., Stauffer, F., Henz, M. E., Marty, M., Lüönd, R. M., Bobálová, J., Schürmann, P., & Neier, R. (2000). Inhibition of Escherichia coli porphobilinogen synthase using analogs of postulated intermediates. Chemistry & Biology. https://doi.org/10.1016/s1074-5521(00)00089-2