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Steroid Chemistry and Biochemistry
Research Guide
What is Steroid Chemistry and Biochemistry?
Steroid Chemistry and Biochemistry is the study of the chemical structures, enzymatic transformations, microbial degradation, and molecular biological mechanisms of steroids, including cholesterol metabolism by microorganisms such as Mycobacterium tuberculosis and actinobacteria.
This field encompasses 51,552 published works focused on microbial transformation and degradation of steroids, particularly cholesterol, involving enzymes like cholesterol oxidase and 3-ketosteroid dehydrogenases. Research examines processes in organisms including Rhodococcus erythropolis and actinobacteria, with applications in biotransformation for drug development. Growth data over the last five years is not available.
Topic Hierarchy
Research Sub-Topics
Microbial Cholesterol Degradation Pathways
This sub-topic examines the biochemical pathways and enzymatic cascades used by bacteria like Mycobacterium tuberculosis and Rhodococcus species to catabolize cholesterol into breakdown products. Researchers investigate gene clusters, transporter proteins, and metabolic intermediates involved in these processes.
Cholesterol Oxidase Enzymology
This area focuses on the structure, kinetics, and catalytic mechanisms of cholesterol oxidase enzymes from actinobacteria, including substrate specificity and cofactor interactions. Studies explore protein engineering for improved activity in biotechnological assays.
3-Ketosteroid Dehydrogenase Mechanisms
Researchers study the biochemical properties, crystal structures, and substrate range of 3-ketosteroid dehydrogenases in steroid metabolism by actinomycetes. This includes their role in ring cleavage and potential for directed evolution.
Steroid Biotransformation by Actinobacteria
This sub-topic covers microbial hydroxylation, dehydrogenation, and side-chain cleavage of steroids using actinobacterial strains like Rhodococcus erythropolis. Research optimizes fermentation conditions and pathway engineering for valuable steroid intermediates.
Enzymatic Processes in Steroid Drug Development
Studies here integrate microbial enzymes into scalable processes for synthesizing pharmaceutical steroids, focusing on yield optimization and impurity profiling. Researchers develop metagenomic screening for novel biocatalysts.
Why It Matters
Steroid chemistry and biochemistry supports diagnostic methods and drug development through enzymatic processes. Allain et al. (1974) introduced an enzymatic method for total serum cholesterol determination using a single aqueous reagent, linear to 600 mg/dl, enabling accurate clinical measurements without sample pretreatment and cited in 9090 works. Beato (1989) detailed gene regulation by steroid hormones, influencing hormone receptor signaling essential for therapies targeting estrogen and progesterone receptors. Brzozowski et al. (1997) revealed the molecular basis of agonism and antagonism in the oestrogen receptor, aiding design of selective modulators for breast cancer treatment. These advances connect to biotechnological steroid biotransformations using microbial enzymes for pharmaceutical production.
Reading Guide
Where to Start
"Enzymatic Determination of Total Serum Cholesterol" by Allain et al. (1974), as it provides a foundational enzymatic method central to steroid analysis with 9090 citations and clear description of cholesterol oxidase use.
Key Papers Explained
Allain et al. (1974) established enzymatic cholesterol measurement, foundational for steroid biochemistry assays. Beato (1989) built on this by explaining steroid hormone gene regulation via receptors. Brzozowski et al. (1997) advanced understanding with estrogen receptor structures, linking to Oñate et al. (1995)'s coactivator discovery that enhances receptor transactivation. Arriza et al. (1987) and Hollenberg et al. (1985) connected mineralocorticoid and glucocorticoid receptor cloning, revealing steroid receptor superfamily kinship.
Paper Timeline
Most-cited paper highlighted in red. Papers ordered chronologically.
Advanced Directions
Current work emphasizes microbial steroid degradation by Mycobacterium tuberculosis and actinobacteria, focusing on 3-ketosteroid dehydrogenases and cholesterol oxidase in biotransformation. No recent preprints or news available, so frontiers remain in enzymatic optimization for drug development from cluster description.
Papers at a Glance
| # | Paper | Year | Venue | Citations | Open Access |
|---|---|---|---|---|---|
| 1 | Enzymatic Determination of Total Serum Cholesterol | 1974 | Clinical Chemistry | 9.1K | ✓ |
| 2 | Gene regulation by steroid hormones | 1989 | Cell | 3.4K | ✕ |
| 3 | Molecular basis of agonism and antagonism in the oestrogen rec... | 1997 | Nature | 3.3K | ✕ |
| 4 | Cyclooxygenases: Structural, Cellular, and Molecular Biology | 2000 | Annual Review of Bioch... | 2.9K | ✕ |
| 5 | Sequence and Characterization of a Coactivator for the Steroid... | 1995 | Science | 2.4K | ✕ |
| 6 | Drug Discovery and Natural Products: End of an Era or an Endle... | 2009 | Science | 2.0K | ✕ |
| 7 | Cloning of Human Mineralocorticoid Receptor Complementary DNA:... | 1987 | Science | 1.9K | ✕ |
| 8 | Primary structure and expression of a functional human glucoco... | 1985 | Nature | 1.9K | ✓ |
| 9 | Cyclooxygenase Isozymes: The Biology of Prostaglandin Synthesi... | 2004 | Pharmacological Reviews | 1.7K | ✕ |
| 10 | An Enzyme from Bacteria able to Destroy Penicillin | 1940 | Nature | 1.3K | ✕ |
Frequently Asked Questions
What is the enzymatic method for determining total serum cholesterol?
Allain et al. (1974) described an enzymatic method using a single aqueous reagent that hydrolyzes cholesterol esters to free cholesterol, with a linear calibration curve to 600 mg/dl and no prior sample treatment required. This approach measures total serum cholesterol accurately for clinical diagnostics. The method relies on cholesterol oxidase in the enzymatic process.
How do steroid hormones regulate gene expression?
Beato (1989) showed that steroid hormones regulate genes through interactions with specific receptors that bind DNA response elements. This process modulates transcription in response to hormonal signals. Such mechanisms underpin steroid biochemistry in cellular signaling.
What is the molecular basis of estrogen receptor agonism and antagonism?
Brzozowski et al. (1997) determined the crystal structures of the estrogen receptor ligand-binding domain bound to agonists and antagonists. Agonists induce a conformation allowing coactivator binding, while antagonists block it. This structural insight explains selective modulation in steroid biochemistry.
What role do coactivators play in steroid hormone receptor activity?
Oñate et al. (1995) identified a coactivator that enhances transcriptional activity of the human progesterone receptor and other steroid receptors using a yeast two-hybrid system. The protein stimulates transactivation without altering basal promoter activity. This finding highlights coregulator functions in steroid signaling.
How was the human mineralocorticoid receptor cloned and characterized?
Arriza et al. (1987) cloned human mineralocorticoid receptor cDNA via low-stringency hybridization with glucocorticoid receptor cDNA, yielding a 107-kilodalton polypeptide. It binds aldosterone with high affinity and activates gene transcription. The receptor shares structural kinship with the glucocorticoid receptor.
What are key enzymes in microbial steroid degradation?
Microbial transformation involves cholesterol oxidase and 3-ketosteroid dehydrogenases in organisms like Mycobacterium tuberculosis and Rhodococcus erythropolis. These enzymes facilitate steroid breakdown and biotransformation. Such processes support biotechnological applications in steroid chemistry.
Open Research Questions
- ? How do specific 3-ketosteroid dehydrogenases in actinobacteria coordinate cholesterol degradation pathways?
- ? What metagenomic factors influence enzymatic hydroxylation efficiency in Rhodococcus erythropolis steroid biotransformation?
- ? How do variations in cholesterol oxidase structures affect microbial steroid metabolism rates?
- ? What unresolved interactions occur between steroid hormone receptors and coactivators in gene regulation?
- ? How can microbial steroid degradation enzymes be optimized for industrial drug synthesis?
Recent Trends
The field maintains 51,552 works with no specified five-year growth rate.
Persistent focus on microbial transformation using cholesterol oxidase and 3-ketosteroid dehydrogenases in Mycobacterium tuberculosis and Rhodococcus erythropolis persists from cluster data.
No recent preprints or news reported in the last six and twelve months, respectively.
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