brenda-database — База данных ферментов для биохимических исследований

--- name: brenda-database description: Access BRENDA enzyme database via SOAP API. Retrieve kinetic parameters (Km, kcat), reaction equations, organism data, and substrate-specific enzyme information for biochemical research and metabolic pathway analysis. license: Unknown metadata: skill-author: K-Dense Inc. --- # BRENDA Database ## Overview BRENDA (BRaunschweig ENzyme DAtabase) is the world's most comprehensive enzyme information system, containing detailed enzyme data from scientific literature. Query kinetic parameters (Km, kcat), reaction equations, substrate specificities, organism information, and optimal conditions for enzymes using the official SOAP API. Access over 45,000 enzymes with millions of kinetic data points for biochemical research, metabolic engineering, and enzyme discovery. ## When to Use This Skill This skill should be used when: - Searching for enzyme kinetic parameters (Km, kcat, Vmax) - Retrieving reaction equations and stoichiometry - Finding enzymes for specific substrates or reactions - Comparing enzyme properties across different organisms - Investigating optimal pH, temperature, and conditions - Accessing enzyme inhibition and activation data - Supporting metabolic pathway reconstruction and retrosynthesis - Performing enzyme engineering and optimization studies - Analyzing substrate specificity and cofactor requirements ## Core Capabilities ### 1. Kinetic Parameter Retrieval Access comprehensive kinetic data for enzymes: **Get Km Values by EC Number**: ```python from brenda_client import get_km_values # Get Km values for all organisms km_data = get_km_values("1.1.1.1") # Alcohol dehydrogenase # Get Km values for specific organism km_data = get_km_values("1.1.1.1", organism="Saccharomyces cerevisiae") # Get Km values for specific substrate km_data = get_km_values("1.1.1.1", substrate="ethanol") ``` **Parse Km Results**: ```python for entry in km_data: print(f"Km: {entry}") # Example output: "organism*Homo sapiens#substrate*ethanol#kmValue*1.2#commentary*" ``` **Extract Specific Information**: ```python from scripts.brenda_queries import parse_km_entry, extract_organism_data for entry in km_data: parsed = parse_km_entry(entry) organism = extract_organism_data(entry) print(f"Organism: {parsed['organism']}") print(f"Substrate: {parsed['substrate']}") print(f"Km value: {parsed['km_value']}") print(f"pH: {parsed.get('ph', 'N/A')}") print(f"Temperature: {parsed.get('temperature', 'N/A')}") ``` ### 2. Reaction Information Retrieve reaction equations and details: **Get Reactions by EC Number**: ```python from brenda_client import get_reactions # Get all reactions for EC number reactions = get_reactions("1.1.1.1") # Filter by organism reactions = get_reactions("1.1.1.1", organism="Escherichia coli") # Search specific reaction reactions = get_reactions("1.1.1.1", reaction="ethanol + NAD+") ``` **Process Reaction Data**: ```python from scripts.brenda_queries import parse_reaction_entry, extract_substrate_products for reaction in reactions: parsed = parse_reaction_entry(reaction) substrates, products = extract_substrate_products(reaction) print(f"Reaction: {parsed['reaction']}") print(f"Organism: {parsed['organism']}") print(f"Substrates: {substrates}") print(f"Products: {products}") ``` ### 3. Enzyme Discovery Find enzymes for specific biochemical transformations: **Find Enzymes by Substrate**: ```python from scripts.brenda_queries import search_enzymes_by_substrate # Find enzymes that act on glucose enzymes = search_enzymes_by_substrate("glucose", limit=20) for enzyme in enzymes: print(f"EC: {enzyme['ec_number']}") print(f"Name: {enzyme['enzyme_name']}") print(f"Reaction: {enzyme['reaction']}") ``` **Find Enzymes by Product**: ```python from scripts.brenda_queries import search_enzymes_by_product # Find enzymes that produce lactate enzymes = search_enzymes_by_product("lactate", limit=10) ``` **Search by Reaction Pattern**: ```python from scripts.brenda_queries import search_by_pattern # Find oxidation reactions enzymes = search_by_pattern("oxidation", limit=15) ``` ### 4. Organism-Specific Enzyme Data Compare enzyme properties across organisms: **Get Enzyme Data for Multiple Organisms**: ```python from scripts.brenda_queries import compare_across_organisms organisms = ["Escherichia coli", "Saccharomyces cerevisiae", "Homo sapiens"] comparison = compare_across_organisms("1.1.1.1", organisms) for org_data in comparison: print(f"Organism: {org_data['organism']}") print(f"Avg Km: {org_data['average_km']}") print(f"Optimal pH: {org_data['optimal_ph']}") print(f"Temperature range: {org_data['temperature_range']}") ``` **Find Organisms with Specific Enzyme**: ```python from scripts.brenda_queries import get_organisms_for_enzyme organisms = get_organisms_for_enzyme("6.3.5.5") # Glutamine synthetase print(f"Found {len(organisms)} organisms with this enzyme") ``` ### 5. Environmental Parameters Access optimal conditions and environmental parameters: **Get pH and Temperature Data**: ```python from scripts.brenda_queries import get_environmental_parameters params = get_environmental_parameters("1.1.1.1") print(f"Optimal pH range: {params['ph_range']}") print(f"Optimal temperature: {params['optimal_temperature']}") print(f"Stability pH: {params['stability_ph']}") print(f"Temperature stability: {params['temperature_stability']}") ``` **Cofactor Requirements**: ```python from scripts.brenda_queries import get_cofactor_requirements cofactors = get_cofactor_requirements("1.1.1.1") for cofactor in cofactors: print(f"Cofactor: {cofactor['name']}") print(f"Type: {cofactor['type']}") print(f"Concentration: {cofactor['concentration']}") ``` ### 6. Substrate Specificity Analyze enzyme substrate preferences: **Get Substrate Specificity Data**: ```python from scripts.brenda_queries import get_substrate_specificity specificity = get_substrate_specificity("1.1.1.1") for substrate in specificity: print(f"Substrate: {substrate['name']}") print(f"Km: {substrate['km']}") print(f"Vmax: {substrate['vmax']}") print(f"kcat: {substrate['kcat']}") print(f"Specificity constant: {substrate['kcat_km_ratio']}") ``` **Compare Substrate Preferences**: ```python from scripts.brenda_queries import compare_substrate_affinity comparison = compare_substrate_affinity("1.1.1.1") sorted_by_km = sorted(comparison, key=lambda x: x['km']) for substrate in sorted_by_km[:5]: # Top 5 lowest Km print(f"{substrate['name']}: Km = {substrate['km']}") ``` ### 7. Inhibition and Activation Access enzyme regulation data: **Get Inhibitor Information**: ```python from scripts.brenda_queries import get_inhibitors inhibitors = get_inhibitors("1.1.1.1") for inhibitor in inhibitors: print(f"Inhibitor: {inhibitor['name']}") print(f"Type: {inhibitor['type']}") print(f"Ki: {inhibitor['ki']}") print(f"IC50: {inhibitor['ic50']}") ``` **Get Activator Information**: ```python from scripts.brenda_queries import get_activators activators = get_activators("1.1.1.1") for activator in activators: print(f"Activator: {activator['name']}") print(f"Effect: {activator['effect']}") print(f"Mechanism: {activator['mechanism']}") ``` ### 8. Enzyme Engineering Support Find engineering targets and alternatives: **Find Thermophilic Homologs**: ```python from scripts.brenda_queries import find_thermophilic_homologs thermophilic = find_thermophilic_homologs("1.1.1.1", min_temp=50) for enzyme in thermophilic: print(f"Organism: {enzyme['organism']}") print(f"Optimal temp: {enzyme['optimal_temperature']}") print(f"Km: {enzyme['km']}") ``` **Find Alkaline/ Acid Stable Variants**: ```python from scripts.brenda_queries import find_ph_stable_variants alkaline = find_ph_stable_variants("1.1.1.1", min_ph=8.0) acidic = find_ph_stable_variants("1.1.1.1", max_ph=6.0) ``` ### 9. Kinetic Modeling Prepare data for kinetic modeling: **Get Kinetic Parameters for Modeling**: ```python from scripts.brenda_queries import get_modeling_parameters model_data = get_modeling_parameters("1.1.1.1", substrate="ethanol") print(f"Km: {model_data['km']}") print(f"Vmax: {model_data['vmax']}") print(f"kcat: {model_data['kcat']}") print(f"Enzyme concentration: {model_data['enzyme_conc']}") print(f"Temperature: {model_data['temperature']}") print(f"pH: {model_data['ph']}") ``` **Generate Michaelis-Menten Plots**: ```python from scripts.brenda_visualization import plot_michaelis_menten # Generate kinetic plots plot_michaelis_menten("1.1.1.1", substrate="ethanol") ``` ## Installation Requirements ```bash uv pip install zeep requests pandas matplotlib seaborn ``` ## Authentication Setup BRENDA requires authentication credentials: 1. **Create .env file**: ``` BRENDA_EMAIL=your.email@example.com BRENDA_PASSWORD=your_brenda_password ``` 2. **Or set environment variables**: ```bash export BRENDA_EMAIL="your.email@example.com" export BRENDA_PASSWORD="your_brenda_password" ``` 3. **Register for BRENDA access**: - Visit https://www.brenda-enzymes.org/ - Create an account - Check your email for credentials - Note: There's also `BRENDA_EMIAL` (note the typo) for legacy support ## Helper Scripts This skill includes comprehensive Python scripts for BRENDA database queries: ### scripts/brenda_queries.py Provides high-level functions for enzyme data analysis: **Key Functions**: - `parse_km_entry(entry)`: Parse BRENDA Km data entries - `parse_reaction_entry(entry)`: Parse reaction data entries - `extract_organism_data(entry)`: Extract organism-specific information - `search_enzymes_by_substrate(substrate, limit)`: Find enzymes for substrates - `search_enzymes_by_product(product, limit)`: Find enzymes producing products - `compare_across_organisms(ec_number, organisms)`: Compare enzyme properties - `get_environmental_parameters(ec_number)`: Get pH and temperature data - `get_cofactor_requirements(ec_number)`: Get cofactor information - `get_substrate_specificity(ec_number)`: Analyze substrate preferences - `get_inhibitors(ec_number)`: Get enzyme inhibition data - `get_activators(ec_number)`: Get enzyme activation data - `find_thermophilic_homologs(ec_number, min_temp)`: Find heat-stable variants - `get_modeling_parameters(ec_number, substrate)`: Get parameters for kinetic modeling - `export_kinetic_data(ec_number, format, filename)`: Export data to file **Usage**: ```python from scripts.brenda_queries import search_enzymes_by_substrate, compare_across_organisms # Search for enzymes enzymes = search_enzymes_by_substrate("glucose", limit=20) # Compare across organisms comparison = compare_across_organisms("1.1.1.1", ["E. coli", "S. cerevisiae"]) ``` ### scripts/brenda_visualization.py Provides visualization functions for enzyme data: **Key Functions**: - `plot_kinetic_parameters(ec_number)`: Plot Km and kcat distributions - `plot_organism_comparison(ec_number, organisms)`: Compare organisms - `plot_pH_profiles(ec_number)`: Plot pH activity profiles - `plot_temperature_profiles(ec_number)`: Plot temperature activity profiles - `plot_substrate_specificity(ec_number)`: Visualize substrate preferences - `plot_michaelis_menten(ec_number, substrate)`: Generate kinetic curves - `create_heatmap_data(enzymes, parameters)`: Create data for heatmaps - `generate_summary_plots(ec_number)`: Create comprehensive enzyme overview **Usage**: ```python from scripts.brenda_visualization import plot_kinetic_parameters, plot_michaelis_menten # Plot kinetic parameters plot_kinetic_parameters("1.1.1.1") # Generate Michaelis-Menten curve plot_michaelis_menten("1.1.1.1", substrate="ethanol") ``` ### scripts/enzyme_pathway_builder.py Build enzymatic pathways and retrosynthetic routes: **Key Functions**: - `find_pathway_for_product(product, max_steps)`: Find enzymatic pathways - `build_retrosynthetic_tree(target, depth)`: Build retrosynthetic tree - `suggest_enzyme_substitutions(ec_number, criteria)`: Suggest enzyme alternatives - `calculate_pathway_feasibility(pathway)`: Evaluate pathway viability - `optimize_pathway_conditions(pathway)`: Suggest optimal conditions - `generate_pathway_report(pathway, filename)`: Create detailed pathway report **Usage**: ```python from scripts.enzyme_pathway_builder import find_pathway_for_product, build_retrosynthetic_tree # Find pathway to product pathway = find_pathway_for_product("lactate", max_steps=3) # Build retrosynthetic tree tree = build_retrosynthetic_tree("lactate", depth=2) ``` ## API Rate Limits and Best Practices **Rate Limits**: - BRENDA API has moderate rate limiting - Recommended: 1 request per second for sustained usage - Maximum: 5 requests per 10 seconds **Best Practices**: 1. **Cache results**: Store frequently accessed enzyme data locally 2. **Batch queries**: Combine related requests when possible 3. **Use specific searches**: Narrow down by organism, substrate when possible 4. **Handle missing data**: Not all enzymes have complete data 5. **Validate EC numbers**: Ensure EC numbers are in correct format 6. **Implement delays**: Add delays between consecutive requests 7. **Use wildcards wisely**: Use '*' for broader searches when appropriate 8. **Monitor quota**: Track your API usage **Error Handling**: ```python from brenda_client import get_km_values, get_reactions from zeep.exceptions import Fault, TransportError try: km_data = get_km_values("1.1.1.1") except RuntimeError as e: print(f"Authentication error: {e}") except Fault as e: print(f"BRENDA API error: {e}") except TransportError as e: print(f"Network error: {e}") except Exception as e: print(f"Unexpected error: {e}") ``` ## Common Workflows ### Workflow 1: Enzyme Discovery for New Substrate Find suitable enzymes for a specific substrate: ```python from brenda_client import get_km_values from scripts.brenda_queries import search_enzymes_by_substrate, compare_substrate_affinity # Search for enzymes that act on substrate substrate = "2-phenylethanol" enzymes = search_enzymes_by_substrate(substrate, limit=15) print(f"Found {len(enzymes)} enzymes for {substrate}") for enzyme in enzymes: print(f"EC {enzyme['ec_number']}: {enzyme['enzyme_name']}") # Get kinetic data for best candidates if enzymes: best_ec = enzymes[0]['ec_number'] km_data = get_km_values(best_ec, substrate=substrate) if km_data: print(f"Kinetic data for {best_ec}:") for entry in km_data[:3]: # First 3 entries print(f" {entry}") ``` ### Workflow 2: Cross-Organism Enzyme Comparison Compare enzyme properties across different organisms: ```python from scripts.brenda_queries import compare_across_organisms, get_environmental_parameters # Define organisms for comparison organisms = [ "Escherichia coli", "Saccharomyces cerevisiae", "Bacillus subtilis", "Thermus thermophilus" ] # Compare alcohol dehydrogenase comparison = compare_across_organisms("1.1.1.1", organisms) print("Cross-organism comparison:") for org_data in comparison: print(f"n{org_data['organism']}:") print(f" Average Km: {org_data['average_km']}") print(f" Optimal pH: {org_data['optimal_ph']}") print(f" Temperature: {org_data['optimal_temperature']}°C") # Get detailed environmental parameters env_params = get_environmental_parameters("1.1.1.1") print(f"nOverall optimal pH range: {env_params['ph_range']}") ``` ### Workflow 3: Enzyme Engineering Target Identification Find engineering opportunities for enzyme improvement: ```python from scripts.brenda_queries import ( find_thermophilic_homologs, find_ph_stable_variants, compare_substrate_affinity ) # Find thermophilic variants for heat stability thermophilic = find_thermophilic_homologs("1.1.1.1", min_temp=50) print(f"Found {len(thermophilic)} thermophilic variants") # Find alkaline-stable variants alkaline = find_ph_stable_variants("1.1.1.1", min_ph=8.0) print(f"Found {len(alkaline)} alkaline-stable variants") # Compare substrate specificities for engineering targets specificity = compare_substrate_affinity("1.1.1.1") print("Substrate affinity ranking:") for i, sub in enumerate(specificity[:5]): print(f" {i+1}. {sub['name']}: Km = {sub['km']}") ``` ### Workflow 4: Enzymatic Pathway Construction Build enzymatic synthesis pathways: ```python from scripts.enzyme_pathway_builder import ( find_pathway_for_product, build_retrosynthetic_tree, calculate_pathway_feasibility ) # Find pathway to target product target = "lactate" pathway = find_pathway_for_product(target, max_steps=3) if pathway: print(f"Found pathway to {target}:") for i, step in enumerate(pathway['steps']): print(f" Step {i+1}: {step['reaction']}") print(f" Enzyme: EC {step['ec_number']}") print(f" Organism: {step['organism']}") # Evaluate pathway feasibility feasibility = calculate_pathway_feasibility(pathway) print(f"nPathway feasibility score: {feasibility['score']}/10") print(f"Potential issues: {feasibility['warnings']}") ``` ### Workflow 5: Kinetic Parameter Analysis Comprehensive kinetic analysis for enzyme selection: ```python from brenda_client import get_km_values from scripts.brenda_queries import parse_km_entry, get_modeling_parameters from scripts.brenda_visualization import plot_kinetic_parameters # Get comprehensive kinetic data ec_number = "1.1.1.1" km_data = get_km_values(ec_number) # Analyze kinetic parameters all_entries = [] for entry in km_data: parsed = parse_km_entry(entry) if parsed['km_value']: all_entries.append(parsed) print(f"Analyzed {len(all_entries)} kinetic entries") # Find best kinetic performer best_km = min(all_entries, key=lambda x: x['km_value']) print(f"nBest kinetic performer:") print(f" Organism: {best_km['organism']}") print(f" Substrate: {best_km['substrate']}") print(f" Km: {best_km['km_value']}") # Get modeling parameters model_data = get_modeling_parameters(ec_number, substrate=best_km['substrate']) print(f"nModeling parameters:") print(f" Km: {model_data['km']}") print(f" kcat: {model_data['kcat']}") print(f" Vmax: {model_data['vmax']}") # Generate visualization plot_kinetic_parameters(ec_number) ``` ### Workflow 6: Industrial Enzyme Selection Select enzymes for industrial applications: ```python from scripts.brenda_queries import ( find_thermophilic_homologs, get_environmental_parameters, get_inhibitors ) # Industrial criteria: high temperature tolerance, organic solvent resistance target_enzyme = "1.1.1.1" # Find thermophilic variants thermophilic = find_thermophilic_homologs(target_enzyme, min_temp=60) print(f"Thermophilic candidates: {len(thermophilic)}") # Check solvent tolerance (inhibitor data) inhibitors = get_inhibitors(target_enzyme) solvent_tolerant = [ inv for inv in inhibitors if 'ethanol' not in inv['name'].lower() and 'methanol' not in inv['name'].lower() ] print(f"Solvent tolerant candidates: {len(solvent_tolerant)}") # Evaluate top candidates for candidate in thermophilic[:3]: print(f"nCandidate: {candidate['organism']}") print(f" Optimal temp: {candidate['optimal_temperature']}°C") print(f" Km: {candidate['km']}") print(f" pH range: {candidate.get('ph_range', 'N/A')}") ``` ## Data Formats and Parsing ### BRENDA Response Format BRENDA returns data in specific formats that need parsing: **Km Value Format**: ``` organism*Escherichia coli#substrate*ethanol#kmValue*1.2#kmValueMaximum*#commentary*pH 7.4, 25°C#ligandStructureId*#literature* ``` **Reaction Format**: ``` ecNumber*1.1.1.1#organism*Saccharomyces cerevisiae#reaction*ethanol + NAD+ <=> acetaldehyde + NADH + H+#commentary*#literature* ``` ### Data Extraction Patterns ```python import re def parse_brenda_field(data, field_name): """Extract specific field from BRENDA data entry""" pattern = f"{field_name}\*([^#]*)" match = re.search(pattern, data) return match.group(1) if match else None def extract_multiple_values(data, field_name): """Extract multiple values for a field""" pattern = f"{field_name}\*([^#]*)" matches = re.findall(pattern, data) return [match for match in matches if match.strip()] ``` ## Reference Documentation For detailed BRENDA documentation, see `references/api_reference.md`. This includes: - Complete SOAP API method documentation - Full parameter lists and formats - EC number structure and validation - Response format specifications - Error codes and handling - Data field definitions - Literature citation formats ## Troubleshooting **Authentication Errors**: - Verify BRENDA_EMAIL and BRENDA_PASSWORD in .env file - Check for correct spelling (note BRENDA_EMIAL legacy support) - Ensure BRENDA account is active and has API access **No Results Returned**: - Try broader searches with wildcards (*) - Check EC number format (e.g., "1.1.1.1" not "1.1.1") - Verify substrate spelling and naming - Some enzymes may have limited data in BRENDA **Rate Limiting**: - Add delays between requests (0.5-1 second) - Cache results locally - Use more specific queries to reduce data volume - Consider batch operations for multiple queries **Network Errors**: - Check internet connection - BRENDA server may be temporarily unavailable - Try again after a few minutes - Consider using VPN if geo-restricted **Data Format Issues**: - Use the provided parsing functions in scripts - BRENDA data can be inconsistent in formatting - Handle missing fields gracefully - Validate parsed data before use **Performance Issues**: - Large queries can be slow; limit search scope - Use specific organism or substrate filters - Consider asynchronous processing for batch operations - Monitor memory usage with large datasets ## Additional Resources - BRENDA Home: https://www.brenda-enzymes.org/ - BRENDA SOAP API Documentation: https://www.brenda-enzymes.org/soap.php - Enzyme Commission (EC) Numbers: https://www.qmul.ac.uk/sbcs/iubmb/enzyme/ - Zeep SOAP Client: https://python-zeep.readthedocs.io/ - Enzyme Nomenclature: https://www.iubmb.org/enzyme/