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-
- calmod model
-
- Data Files:
-
- The calcium binding protein calmodulin solved in this laboratory
- was taken from the Protein Data Bank (code is "3CLN").
- The file was edited to remove all but the main reference and protein
- and calcium atoms and named "calmod.pdb".
-
-
- A secondary structure assignment was made based on H-bonding:
- pdb-pro-pdb calmod.pdb calmod.ss
-
- This file was then edited to replace the 'S' at the ends of
- the sheets with an 'A' to produce "arrows" on the sheet.
- ( at Babu's advice, set 26-28, 62-64, 99-101, 135-137 to sheets,
- and lengthened helices 4 and 6 by one residue, helix 8 by 2. )
-
- The *.ribbons file consists of only one filename:
- ls calmod.ss > calmod.ribbons
-
- This file was then edited to add a special color file, "protein.color".
-
- The *.coords file consists of only one filename:
- ls calmod.pdb > calmod.coords
-
- The calcium atoms were separated placed in a separate file:
- GREP HETATM calmod.pdb > calmod_cal.pdb
-
- The calciums were turned into silver spheres (color-11)
- pdb-range-sph calmod_cal.pdb calmod_cal.sph
- ( input line-1 at terminal: 1 4 11 )
- ( input line-2 at terminal: ctrl-D )
-
- The *.atoms file consists of only one filename:
- ls calmod_cal.sph > calmod.atoms
-
- The cylinders to model the helix were created in several steps.
- First, a list was prepared of the residue ranges in the helices:
- ss-hx-range calmod.ss calmod_hx.run
-
- Next the alpha carbons in these ranges are fit to ideal helics:
- pdb-hx-fit calmod.pdb calmod_hx.run > calmod_hx.fit
-
- Finally the fit output is converted to bond format:
- hx-dipole-cyl calmod_hx.fit calmod_hx.cyl
-
- The *.bonds file consists of only one filename:
- ls calmod_hx.cyl > calmod.bonds
-
- The *.ss file was enhanced to include coloring by equivalent
- helices in the domains and by mainchain dihedral values.
-
- The file calmod_hx.run was edited to chose colors for the ranges,
- then a new *.ss file was created (the old thrown replaced):
- pdb-range-ss calmod.ss new.ss
- mv new.ss calmod.ss
-
- Next "rama" and "omega" keys were added:
- pdb-rama-ss calmod.pdb calmod.ss
-
- The *.model file was generated:
- pdb-model calmod.pdb calmod.model
-
- The protein ribbon model, plus atoms, plus "bonds" is now ready
- for display.
-
-
-
- Image File: calmod.rgb
-
- The model was displayed with default settings on the Ribbon Panel
- for everything except:
- Chain Color = "15" (gold)
- Helix Style = "Circle"
- Coil Style = "Circle"
- Ribbon Threads = "13"
- Ribbon Samples = "13"
- Sheet Width = "4.0"
- Helix Width = "1.3"
- Helix Depth = "1.3"
- Coil Width = "1.7"
- Coil Depth = "0.3"
- The color #11 (silver) was modified with the Color Panel to
- add Blue Emission, to produce the glowing calcium atoms.
- The Geom Panel had the default settings except:
- Sphere Radii = "1.25"
- Bond Radii = "1.35"
- Cylinder Depth = "24"
- The image was saved from the Geom Panel.
-
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