cctbx/cctbx_project
Oct 2024 – Oct 2025
11 Months active
Languages Used
PythonC++
Technical Skills
BioinformaticsC++ (via Python bindings)Code OrganizationComputational ChemistryPython DevelopmentRefactoring
Nigel W. Moriarty
PROFILE
Nigel W. Moriarty
Nathan Moriarty developed advanced structural biology and cheminformatics features in the cctbx/cctbx_project repository, focusing on robust geometry restraints, hydrogen placement, and ligand discovery workflows. He engineered command-line tools and backend modules in Python and C++, integrating quantum mechanics, data validation, and error handling to improve model accuracy and workflow reliability. His work included automated restraint processing, flexible configuration for quantum calculations, and enhanced ligand similarity search using SMILES and RCSB APIs. By refactoring core modules and expanding test coverage, Nathan improved maintainability and data integrity, enabling more efficient, reproducible crystallographic modeling and analysis for scientific computing applications.
Overall Statistics
Feature vs Bugs
82%Features
Repository Contributions
58Total
Bugs
6
Commits
58
Features
27
Lines of code
3,598
Activity Months11
Your Network
76 people
Work History
October 2025
2 Commits • 1 Features
Oct 1, 2025In October 2025, delivered targeted improvements to the cctbx/cctbx_project workflow that enhance geometry analysis and hydrogen-placement reliability for crystallographic modeling. The work improves model accuracy, reduces downstream validation effort, and strengthens the reproducibility of analysis through clear commit history and well-scoped changes. Key features delivered and major fixes: - TAAM Advanced Atom Typing Command-Line Tool: new CLI within the TAAM framework that analyzes PDB files to report bonding, planarity, and symmetry relationships between atoms, enabling detailed insights into molecular geometry for crystallographic models. - Hydrogen placement refinement for N-terminal peptide backbone: fixes hydrogen placement by skipping processing when the N-terminal atom has exactly three bonds, and introduces a bonds_in_restraints utility to support this logic. Overall impact and accomplishments: - Improved accuracy and reliability of geometry analysis and hydrogen placement, reducing model refinement iterations and QA time. - Strengthened end-to-end tooling within cctbx/cctbx_project, enabling faster, more trustworthy crystallographic workflows. Technologies/skills demonstrated: - Python CLI development and integration with the cctbx framework - PDB geometry analysis (bonding, planarity, symmetry) and restraints handling - Utility-driven development (new bonds_in_restraints) and clear commit-based traceability
2 Commits • 1 Features
Oct 1, 2025In October 2025, delivered targeted improvements to the cctbx/cctbx_project workflow that enhance geometry analysis and hydrogen-placement reliability for crystallographic modeling. The work improves model accuracy, reduces downstream validation effort, and strengthens the reproducibility of analysis through clear commit history and well-scoped changes. Key features delivered and major fixes: - TAAM Advanced Atom Typing Command-Line Tool: new CLI within the TAAM framework that analyzes PDB files to report bonding, planarity, and symmetry relationships between atoms, enabling detailed insights into molecular geometry for crystallographic models. - Hydrogen placement refinement for N-terminal peptide backbone: fixes hydrogen placement by skipping processing when the N-terminal atom has exactly three bonds, and introduces a bonds_in_restraints utility to support this logic. Overall impact and accomplishments: - Improved accuracy and reliability of geometry analysis and hydrogen placement, reducing model refinement iterations and QA time. - Strengthened end-to-end tooling within cctbx/cctbx_project, enabling faster, more trustworthy crystallographic workflows. Technologies/skills demonstrated: - Python CLI development and integration with the cctbx framework - PDB geometry analysis (bonding, planarity, symmetry) and restraints handling - Utility-driven development (new bonds_in_restraints) and clear commit-based traceability
October 2025
September 2025
11 Commits • 4 Features
Sep 1, 2025Month: 2025-09 Focus: Delivery of core data management utilities, enhanced search capabilities for ligand screening, and advancement of QM workflows with improved geometry restraints within the cctbx_project repository. The work emphasizes practical business value: faster data preparation, more flexible and accurate ligand matching, and expanded computational chemistry capabilities, while maintaining code quality and maintainability.
September 2025
11 Commits • 4 Features
Sep 1, 2025Month: 2025-09 Focus: Delivery of core data management utilities, enhanced search capabilities for ligand screening, and advancement of QM workflows with improved geometry restraints within the cctbx_project repository. The work emphasizes practical business value: faster data preparation, more flexible and accurate ligand matching, and expanded computational chemistry capabilities, while maintaining code quality and maintainability.
August 2025
10 Commits • 4 Features
Aug 1, 2025Monthly summary for 2025-08 - cctbx/cctbx_project. This month delivered a set of enhancements and robustness improvements across restraint processing, CIF utilities, and ligand discovery, with a focus on business value and reliability in automated structure refinement workflows. Key features delivered: - Enol peptide restraints module and tests: new enol_peptide_restraints.py to automatically adjust bond, angle, and dihedral restraints for enol peptides; accompanying tests verify handling of enol-peptide bonds and improved validation and verbosity in outputs. - PH-dependent and conformational restraints enhancements: refactored pH-dependent restraints, improved process_bonds to update or add proxies, enhanced logging/reporting of changes, robust handling of missing hydrogens, and updated conformation-dependent library for more accurate analyses. - Geostd CIF/file utilities and component handling: added get_filenames_from_start for component codes with a prefix; refactored get_geostd_cif_file to a general get_geostd_file; added optional verbose flag to get_cif_list for debugging. - RCSB ligand similarity search via SMILES: introduced get_similar_ligands_via_smiles to query RCSB for chemically similar ligands, with CLI usage improvements and relaxed structure restrictions. Major bugs fixed: - Geometry restraint robustness: fixed cif_mod delete crash by adding safe handling for unknown atom_id, and introduced origin_id-based proxy override for in-place proxy data replacement under specific conditions, increasing stability of geometry restraint processing. Overall impact and accomplishments: - Reduced manual curation and increased throughput for structure refinement by automating complex restraint handling (enol, pH, and conformational restraints). - Improved data integrity and resilience in restraint updates and CIF utilities, enabling more reliable batch processing pipelines. - Expanded ligand discovery capabilities through SMILES-based similarity search, aiding methodological exploration and potential ligand optimization. Technologies/skills demonstrated: - Python-based restraint engineering, robust exception handling, and improved logging. - Comprehensive unit testing for new modules and changes. - Code refactoring for maintainability and clearer data processing flows. - CLI/usability enhancements for data querying and debugging.
10 Commits • 4 Features
Aug 1, 2025Monthly summary for 2025-08 - cctbx/cctbx_project. This month delivered a set of enhancements and robustness improvements across restraint processing, CIF utilities, and ligand discovery, with a focus on business value and reliability in automated structure refinement workflows. Key features delivered: - Enol peptide restraints module and tests: new enol_peptide_restraints.py to automatically adjust bond, angle, and dihedral restraints for enol peptides; accompanying tests verify handling of enol-peptide bonds and improved validation and verbosity in outputs. - PH-dependent and conformational restraints enhancements: refactored pH-dependent restraints, improved process_bonds to update or add proxies, enhanced logging/reporting of changes, robust handling of missing hydrogens, and updated conformation-dependent library for more accurate analyses. - Geostd CIF/file utilities and component handling: added get_filenames_from_start for component codes with a prefix; refactored get_geostd_cif_file to a general get_geostd_file; added optional verbose flag to get_cif_list for debugging. - RCSB ligand similarity search via SMILES: introduced get_similar_ligands_via_smiles to query RCSB for chemically similar ligands, with CLI usage improvements and relaxed structure restrictions. Major bugs fixed: - Geometry restraint robustness: fixed cif_mod delete crash by adding safe handling for unknown atom_id, and introduced origin_id-based proxy override for in-place proxy data replacement under specific conditions, increasing stability of geometry restraint processing. Overall impact and accomplishments: - Reduced manual curation and increased throughput for structure refinement by automating complex restraint handling (enol, pH, and conformational restraints). - Improved data integrity and resilience in restraint updates and CIF utilities, enabling more reliable batch processing pipelines. - Expanded ligand discovery capabilities through SMILES-based similarity search, aiding methodological exploration and potential ligand optimization. Technologies/skills demonstrated: - Python-based restraint engineering, robust exception handling, and improved logging. - Comprehensive unit testing for new modules and changes. - Code refactoring for maintainability and clearer data processing flows. - CLI/usability enhancements for data querying and debugging.
August 2025
July 2025
5 Commits • 4 Features
Jul 1, 2025July 2025: Implemented foundational data handling improvements in cctbx_project, centralizing chemical data utilities (obsolete status and geostandard CIF retrieval). Extended radial_deviation to accept Cartesian coordinates (x, y) and convert to polar (r, theta) with updated tests. Enhanced protein conformational analysis with refined hydrogen bond descriptions and added residue-atom/bonds tracing in the geometry restraints module. Strengthened hydrogen reduction with user-supplied restraints support and a rollback of an unnecessary restraint-handling change to avoid affecting specific residue types. All work focused on increasing reliability, data integrity, and applicability to structural biology workflows.
July 2025
5 Commits • 4 Features
Jul 1, 2025July 2025: Implemented foundational data handling improvements in cctbx_project, centralizing chemical data utilities (obsolete status and geostandard CIF retrieval). Extended radial_deviation to accept Cartesian coordinates (x, y) and convert to polar (r, theta) with updated tests. Enhanced protein conformational analysis with refined hydrogen bond descriptions and added residue-atom/bonds tracing in the geometry restraints module. Strengthened hydrogen reduction with user-supplied restraints support and a rollback of an unnecessary restraint-handling change to avoid affecting specific residue types. All work focused on increasing reliability, data integrity, and applicability to structural biology workflows.
May 2025
8 Commits • 3 Features
May 1, 2025May 2025 monthly summary for cctbx/cctbx_project focusing on delivering robust structural data handling, improved monomer library server behavior, and enhanced nucleic acid processing. Highlights include features and improvements across PDB interpretation, ligand naming and restraint handling, DNA/RNA detection granularity, and regression test alignment with updated models.
8 Commits • 3 Features
May 1, 2025May 2025 monthly summary for cctbx/cctbx_project focusing on delivering robust structural data handling, improved monomer library server behavior, and enhanced nucleic acid processing. Highlights include features and improvements across PDB interpretation, ligand naming and restraint handling, DNA/RNA detection granularity, and regression test alignment with updated models.
May 2025
April 2025
6 Commits • 2 Features
Apr 1, 2025Monthly summary for 2025-04 (cctbx/cctbx_project): Key features delivered: - Geometry Restraints: Origin-aware deviations and RMSZ improvements implemented to support origin_id for proxies, default origin_id for RMSZ, and improved handling of deviations and RMSZ calculations; robustness improvements to sigma calculation and validation. - Amino/Nucleic acid residue list updates: Updated lists of modified amino acid and nucleic acid names, added new codes, removed outdated ones, and updated the generation date to reflect changes. Major bugs fixed: - Hydrogen bond RMSD test robustness: Refactored assertion logic in exercise_hydrogen_bond_rmsd and added dependency checks to run tests only when chem_data and ksdssp are available. Overall impact and accomplishments: - Improved modeling accuracy and data integrity by enabling origin-aware geometry restraints and more robust RMSZ calculations; reduced test flakiness and ensured tests run only with complete dependencies; kept residue naming in sync with current biology to minimize downstream mapping issues. Technologies/skills demonstrated: - Geometry restraints algorithms, test robustness, Python codebase, data validation, test-driven development, and release-ready workflow improvements (CI test readiness).
April 2025
6 Commits • 2 Features
Apr 1, 2025Monthly summary for 2025-04 (cctbx/cctbx_project): Key features delivered: - Geometry Restraints: Origin-aware deviations and RMSZ improvements implemented to support origin_id for proxies, default origin_id for RMSZ, and improved handling of deviations and RMSZ calculations; robustness improvements to sigma calculation and validation. - Amino/Nucleic acid residue list updates: Updated lists of modified amino acid and nucleic acid names, added new codes, removed outdated ones, and updated the generation date to reflect changes. Major bugs fixed: - Hydrogen bond RMSD test robustness: Refactored assertion logic in exercise_hydrogen_bond_rmsd and added dependency checks to run tests only when chem_data and ksdssp are available. Overall impact and accomplishments: - Improved modeling accuracy and data integrity by enabling origin-aware geometry restraints and more robust RMSZ calculations; reduced test flakiness and ensured tests run only with complete dependencies; kept residue naming in sync with current biology to minimize downstream mapping issues. Technologies/skills demonstrated: - Geometry restraints algorithms, test robustness, Python codebase, data validation, test-driven development, and release-ready workflow improvements (CI test readiness).
March 2025
3 Commits • 2 Features
Mar 1, 2025March 2025 (2025-03) — cctbx/cctbx_project monthly delivery overview focusing on business value, reliability, and maintainability. Key features delivered, major bugs fixed, and the resulting impact.
3 Commits • 2 Features
Mar 1, 2025March 2025 (2025-03) — cctbx/cctbx_project monthly delivery overview focusing on business value, reliability, and maintainability. Key features delivered, major bugs fixed, and the resulting impact.
March 2025
February 2025
3 Commits • 2 Features
Feb 1, 2025February 2025: In cctbx/cctbx_project, delivered configurable default handling for quantum restraints via PHIL overrides, enabling more flexible charge/multiplicity configuration and ensuring computed values are used when defaults are not set. Introduced granular geometry restraints reporting by propagating origin_id to core functions and adding per-origin RMSD in model statistics for nuanced diagnostics. Fixed syntax error in statistics.py and improved readability of bonding/angle statistics output to aid analysis and debugging. These changes improve configurability, traceability, and maintainability, delivering business value by enabling more reliable workflows and faster debugging.
February 2025
3 Commits • 2 Features
Feb 1, 2025February 2025: In cctbx/cctbx_project, delivered configurable default handling for quantum restraints via PHIL overrides, enabling more flexible charge/multiplicity configuration and ensuring computed values are used when defaults are not set. Introduced granular geometry restraints reporting by propagating origin_id to core functions and adding per-origin RMSD in model statistics for nuanced diagnostics. Fixed syntax error in statistics.py and improved readability of bonding/angle statistics output to aid analysis and debugging. These changes improve configurability, traceability, and maintainability, delivering business value by enabling more reliable workflows and faster debugging.
December 2024
2 Commits • 1 Features
Dec 1, 2024Month 2024-12 monthly summary for the developer: Key features delivered, major fixes, and overall impact focused on business value and technical excellence. In cctbx/cctbx_project, delivered restraints processing improvements with enhanced diagnostics, robustness, and maintainability.
2 Commits • 1 Features
Dec 1, 2024Month 2024-12 monthly summary for the developer: Key features delivered, major fixes, and overall impact focused on business value and technical excellence. In cctbx/cctbx_project, delivered restraints processing improvements with enhanced diagnostics, robustness, and maintainability.
December 2024
November 2024
4 Commits • 3 Features
Nov 1, 2024November 2024 (Month: 2024-11): Delivered three focused enhancements in cctbx_project that advance quantum chemistry, structural linking, and report readability, while stabilizing error handling. These changes improve spin-state control for open-shell QM calculations, enable granular residue-level connections with safer origin_id handling, and polish multi-line map output messages for easier analysis and reporting. Together, they strengthen modeling accuracy, data integrity, and user-facing clarity, accelerating scientific throughput.
November 2024
4 Commits • 3 Features
Nov 1, 2024November 2024 (Month: 2024-11): Delivered three focused enhancements in cctbx_project that advance quantum chemistry, structural linking, and report readability, while stabilizing error handling. These changes improve spin-state control for open-shell QM calculations, enable granular residue-level connections with safer origin_id handling, and polish multi-line map output messages for easier analysis and reporting. Together, they strengthen modeling accuracy, data integrity, and user-facing clarity, accelerating scientific throughput.
October 2024
4 Commits • 1 Features
Oct 1, 2024October 2024 (cctbx_project): Delivered targeted hydrogen placement and restraint improvements for amino acids and nucleic acids. Features: suppress H2/HXT during peptide-link restraints and centralize polymer hydrogen handling in the place_hydrogens workflow. Bugs fixed: stabilized hydrogen reduction/restraint paths and reduced edge-case inconsistencies through centralized control and expanded tests. Impact: enhanced accuracy and reliability of biomolecular restraints across amino/nucleic acids and non-standard residues, enabling more robust modeling workflows. Technologies/skills: advanced hydrogen logic, workflow refactoring, test-driven development, and cross-repo code consolidation across Python/C++ tooling.
4 Commits • 1 Features
Oct 1, 2024October 2024 (cctbx_project): Delivered targeted hydrogen placement and restraint improvements for amino acids and nucleic acids. Features: suppress H2/HXT during peptide-link restraints and centralize polymer hydrogen handling in the place_hydrogens workflow. Bugs fixed: stabilized hydrogen reduction/restraint paths and reduced edge-case inconsistencies through centralized control and expanded tests. Impact: enhanced accuracy and reliability of biomolecular restraints across amino/nucleic acids and non-standard residues, enabling more robust modeling workflows. Technologies/skills: advanced hydrogen logic, workflow refactoring, test-driven development, and cross-repo code consolidation across Python/C++ tooling.
October 2024
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Quality Metrics
Correctness82.8%
Maintainability82.8%
Architecture76.8%
Performance68.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++Python
Technical Skills
cheminformaticsAPI IntegrationBackend DevelopmentBioinformaticsBug FixingC++C++ (via CCTBX)C++ (via Python bindings)C++ (via extension modules)Chemical InformaticsCode AnalysisCode CleanupCode CorrectionCode GenerationCode Organization
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