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The Pathway/Genome Navigator

The Pathway/Genome Navigator. (These slides are a guide as you experiment with the Navigator). Pathway/Genome Navigator – topics. Getting started with the Navigator Organism pages Queries in general Object displays and queries Miscellaneous commands User preferences Lab exercises.

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The Pathway/Genome Navigator

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  1. The Pathway/Genome Navigator (These slides are a guide as you experiment with the Navigator)

  2. Pathway/Genome Navigator – topics • Getting started with the Navigator • Organism pages • Queries in general • Object displays and queries • Miscellaneous commands • User preferences • Lab exercises

  3. Introduction • Navigator runs both on the desktop and on the web • The desktop version generally has more capabilities

  4. Desktop Layout • One Large Window • Several Panes: • Display pane • Command menu • LISP listener

  5. Menus • Main command menu • Single-choice menu • Multiple-choice menu (e.g. after a search) • Aborting out of menus • Click Cancel or No Select • Click outside the menu • Type ^z

  6. Using the Mouse • Left mouse button: to invoke specific commands and for hypertext navigation • Right mouse button: to bring up menus of additional operations (for example, when editing a frame) • Middle mouse button: for very specialized uses (you probably won’t use it) • Mouse documentation line (shows what you’re over, what you can do)

  7. Organism Pages • All Organisms Page • Organism grouping • Summary of organisms • Single organism page • Summary of organism stats • Notion of current organism • Command mode queries • Comparative analyses • Clicking through links – organism continuity

  8. Queries with multiple answers • Results in form of a menu to: • select one • some • all • Answer List • Next Answer

  9. Indirect Queries • Related objects • Objects are clickable • Objects are color-coded by type

  10. History List • Backward history • Forward history • Select from history

  11. Complex Queries • WWW Form • Write queries in LISP • Must understand features of schema • class names • slot names • Pathway tools site has example searches • Definitely learnable • Can place results on the answer list

  12. Shared Display Characteristics • Gene-Reaction schematic • Citations and comments • Database Links • Classes

  13. Gene-Reaction Schematic • Drawn in reaction, protein, and gene windows • Representations (ArgB) • Genes are boxes on the right • Proteins are circles in the middle – numbers show complexes • Reactions in box on left, with E.C. number if available • Allows navigation between genes, proteins, rxns • Links proteins with shared reactions • ArgD • Links members of protein complexes • Pol III – extreme example

  14. Citations and Comments • Citations in mnemonic form • Click on citation – go to citations at bottom of page • Click there, go to PubMed ref, if available

  15. Database Links • Unification links (info about the protein elsewhere) • PDB • PIR • RefSeq • UniProt • Gene page: For coli, we added links to coli-specific sites • Relationship links: • PDB-Homolog-P34554

  16. Class Hierarchies • Reactions • Enzyme-nomenclature system (full EC system in MetaCyc only) • Proteins • Gene Ontology terms are assigned to proteins • Can also assign MultiFun terms • Compounds • Pathways

  17. Menu Categories • Pathway • Reaction • Protein • (RNA) • Gene • Compound

  18. Pathway Mode Commands • Search by pathway name • Search by substring • Search by class • Search by substrates (can pick role in pathway)

  19. What’s in a pathway frame? • Go to arginine biosynthesis I (from ArgD) • Intermediates and reactions • Can toggle level of detail • Feedback regulation can be shown • Locations of mapped genes • Genetic regulation schematic • Note presence of comments, citations, class hierarchy

  20. Reaction Mode Commands • Search by reaction name • Search by E.C. # • Search by class (another E.C. interface) • Search by pathway • Search by substrates

  21. What’s in a reaction frame? • Search by EC for 2.6.1.11 (pick one) • Picture of reaction with clickable compounds • Pathways the reaction is involved in • Place in class hierarchy • Enzymes carrying out reaction (note schematic)

  22. Protein Mode Commands • Search by protein name • Search by substring • Search by pathway • Search by organism (MetaCyc) • Search by UniProt Acc • Search by GO term • Search by MultiFun term • Search by Weight, pI • Search by modulation of activity

  23. What’s in a protein frame? • Sample frame (ArgD) • Synonyms, general features, comments • Unification links, gene-reaction schematic • GO terms • Enzymatic reaction frames – how this protein carries out that reaction (bridging the two) • Evidence codes

  24. Gene Mode Commands • Search by gene name (can also put in TU IDs) • Search by substring • Get gene by class • Basically the same for RNAs

  25. What’s in a gene frame? • Sample frame (argC) • Synonyms, classification (GO), link to browser • Unification links, gene-reaction schematic • Regulation schematic • Gene local context and TUs

  26. What’s in a TU frame? • Sample frame (argCBH) • Genes in context, with TFs • Promoter with start site and citations • TF binding sites, with citations • Regulatory interactions (ilvL attenuator in TU524)

  27. Compound Mode Commands • Search compound by name • Search compound by substring • Search by SMILES (structure) • Search by class • Advanced search

  28. The SMILES Language • Simplified Molecular Input Line Entry System • Formal language for describing chemical structures • Used within the Pathway Tools in a substructure search • Case is significant (lowercase for aromatic rings) • Examples: formate C(=O)O malate OC(=O)CC(O)C(O)=O • For more information, see the Help facility

  29. What’s in a compound frame? • Sample (N-acetylglutamyl-phosphate) • Synonyms, empirical formula, MW, links • Structure (you can add these in editors) • SMILES code • Pathways and reactions involving this compound

  30. Miscellaneous Commands • History commands • Answer-List commands • Clone window command • Fix window and unfix window commands • Other commands: • Print to file (makes a postscript) • Help • Preferences • Exit

  31. User Preferences • Color • Layout • Compound window • Reaction window • Pathway window • History/Answer list • Reverting and saving user preferences

  32. Lab Exercises • Set up personal preferences for: Color Layout (set number of windows to 2) • Save new preferences • Play with settings for Compound, Reaction, Pathway, and Overview windows. • Choose settings for History/Answer List preferences

  33. Lab Exercises • Retrieve compounds containing a formate group • Retrieve compounds adenine and uracil using class query • Retrieve reaction with EC# 5.3.1.9 • Retrieve all reactions in the class sulfurtransferases • Retrieve all reactions involved in proline biosynthesis • Retrieve all reactions where glutamate appears on left side • genes coding for enzymes involved in the degradation of short-chain fatty acids

  34. Lab Exercises • Retrieve all enzymes involved in purine biosynthesis • Retrieve all kinases • Display region spanning from 10 % - 20 % of E. coli chromosome • Display chromosomal region around gene aroA • Display a map showing all chaperone genes

  35. Lab Exercises • Retrieve all chaperone genes • Retrieve gene aroA • Find the glutamine biosynthesis pathway by issuing each of the three types of queries in Pathway mode.

  36. Lab Exercises • Clone window • Navigate in the cloned window • Set preferences so Navigator displays 2 windows • Navigate by clicking on live objects • Fix Window • Navigate in unfixed window • Fix second window and then click on live object

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