
                                 pepwheel 



Function

   Shows protein sequences as helices

Description

   pepwheel displays peptide sequences in a helical representation.

   This gives a view of a helix from a protein sequence looking down the
   axis of the helix.

   It is useful for highlighting amphipathicity and other properties of
   residues around a helix.

Usage

   Here is a sample session with pepwheel


% pepwheel tsw:hbb_human -send 30 
Shows protein sequences as helices
Graph type [x11]: cps

Created pepwheel.ps

   Go to the input files for this example
   Go to the output files for this example

Command line arguments

   Standard (Mandatory) qualifiers:
  [-sequence]          sequence   Sequence USA
   -graph              graph      Graph type

   Additional (Optional) qualifiers (* if not always prompted):
   -steps              integer    The number of residues plotted per turn is
                                  this value divided by the 'turns' value.
   -turns              integer    The number of residues plotted per turn is
                                  the 'steps' value divided by this value.
*  -squares            string     By default the aliphatic residues ILVM are
                                  marked with squares.
*  -diamonds           string     By default the residues DENQST are marked
                                  with diamonds.
*  -octags             string     By default the positively charged residues
                                  HKR are marked with octagons.

   Advanced (Unprompted) qualifiers:
   -[no]wheel          boolean    Plot the wheel
   -amphipathic        toggle     If this is true then the residues ACFGILMVWY
                                  are marked as squares and all other
                                  residues are unmarked. This overrides any
                                  other markup that you may have specified
                                  using the qualifiers '-squares', '-diamonds'
                                  and '-octags'.

   Associated qualifiers:

   "-sequence" associated qualifiers
   -sbegin1             integer    Start of the sequence to be used
   -send1               integer    End of the sequence to be used
   -sreverse1           boolean    Reverse (if DNA)
   -sask1               boolean    Ask for begin/end/reverse
   -snucleotide1        boolean    Sequence is nucleotide
   -sprotein1           boolean    Sequence is protein
   -slower1             boolean    Make lower case
   -supper1             boolean    Make upper case
   -sformat1            string     Input sequence format
   -sdbname1            string     Database name
   -sid1                string     Entryname
   -ufo1                string     UFO features
   -fformat1            string     Features format
   -fopenfile1          string     Features file name

   "-graph" associated qualifiers
   -gprompt             boolean    Graph prompting
   -gtitle              string     Graph title
   -gsubtitle           string     Graph subtitle
   -gxtitle             string     Graph x axis title
   -gytitle             string     Graph y axis title
   -goutfile            string     Output file for non interactive displays
   -gdirectory          string     Output directory

   General qualifiers:
   -auto                boolean    Turn off prompts
   -stdout              boolean    Write standard output
   -filter              boolean    Read standard input, write standard output
   -options             boolean    Prompt for standard and additional values
   -debug               boolean    Write debug output to program.dbg
   -verbose             boolean    Report some/full command line options
   -help                boolean    Report command line options. More
                                  information on associated and general
                                  qualifiers can be found with -help -verbose
   -warning             boolean    Report warnings
   -error               boolean    Report errors
   -fatal               boolean    Report fatal errors
   -die                 boolean    Report deaths


   Standard (Mandatory) qualifiers Allowed values Default
   [-sequence]
   (Parameter 1) Sequence USA Readable sequence Required
   -graph Graph type EMBOSS has a list of known devices, including
   postscript, ps, hpgl, hp7470, hp7580, meta, colourps, cps, xwindows,
   x11, tektronics, tekt, tek4107t, tek, none, null, text, data, xterm,
   png, xml EMBOSS_GRAPHICS value, or x11
   Additional (Optional) qualifiers Allowed values Default
   -steps The number of residues plotted per turn is this value divided
   by the 'turns' value. Integer from 2 to 100 18
   -turns The number of residues plotted per turn is the 'steps' value
   divided by this value. Integer from 1 to 100 5
   -squares By default the aliphatic residues ILVM are marked with
   squares. Any string is accepted ILVM
   -diamonds By default the residues DENQST are marked with diamonds. Any
   string is accepted DENQST
   -octags By default the positively charged residues HKR are marked with
   octagons. Any string is accepted HKR
   Advanced (Unprompted) qualifiers Allowed values Default
   -[no]wheel Plot the wheel Boolean value Yes/No Yes
   -amphipathic If this is true then the residues ACFGILMVWY are marked
   as squares and all other residues are unmarked. This overrides any
   other markup that you may have specified using the qualifiers
   '-squares', '-diamonds' and '-octags'. Toggle value Yes/No No

Input file format

   pepwheel reads any protein sequence USA.

  Input files for usage example

   'tsw:hbb_human' is a sequence entry in the example protein database
   'tsw'

  Database entry: tsw:hbb_human

ID   HBB_HUMAN      STANDARD;      PRT;   146 AA.
AC   P02023;
DT   21-JUL-1986 (Rel. 01, Created)
DT   21-JUL-1986 (Rel. 01, Last sequence update)
DT   15-JUL-1999 (Rel. 38, Last annotation update)
DE   HEMOGLOBIN BETA CHAIN.
GN   HBB.
OS   Homo sapiens (Human), Pan troglodytes (Chimpanzee), and
OS   Pan paniscus (Pygmy chimpanzee) (Bonobo).
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Mammalia;
OC   Eutheria; Primates; Catarrhini; Hominidae; Homo.
RN   [1]
RP   SEQUENCE.
RC   SPECIES=HUMAN;
RA   BRAUNITZER G., GEHRING-MULLER R., HILSCHMANN N., HILSE K., HOBOM G.,
RA   RUDLOFF V., WITTMANN-LIEBOLD B.;
RT   "The constitution of normal adult human haemoglobin.";
RL   Hoppe-Seyler's Z. Physiol. Chem. 325:283-286(1961).
RN   [2]
RP   SEQUENCE FROM N.A.
RC   SPECIES=HUMAN;
RX   MEDLINE; 81064667.
RA   LAWN R.M., EFSTRATIADIS A., O'CONNELL C., MANIATIS T.;
RT   "The nucleotide sequence of the human beta-globin gene.";
RL   Cell 21:647-651(1980).
RN   [3]
RP   SEQUENCE OF 121-146 FROM N.A.
RC   SPECIES=HUMAN;
RX   MEDLINE; 85205333.
RA   LANG K.M., SPRITZ R.A.;
RT   "Cloning specific complete polyadenylylated 3'-terminal cDNA
RT   segments.";
RL   Gene 33:191-196(1985).
RN   [4]
RP   X-RAY CRYSTALLOGRAPHY (2.5 ANGSTROMS) OF DEOXYHEMOGLOBIN.
RC   SPECIES=HUMAN;
RX   MEDLINE; 76027820.
RA   FERMI G.;
RT   "Three-dimensional fourier synthesis of human deoxyhaemoglobin at
RT   2.5-A resolution: refinement of the atomic model.";
RL   J. Mol. Biol. 97:237-256(1975).
RN   [5]
RP   SEQUENCE.
RC   SPECIES=P.TROGLODYTES;
RX   MEDLINE; 66071496.
RA   RIFKIN D.B., KONIGSBERG W.;
RT   "The characterization of the tryptic peptides from the hemoglobin of
RT   the chimpanzee (Pan troglodytes).";
RL   Biochim. Biophys. Acta 104:457-461(1965).
RN   [6]


  [Part of this file has been deleted for brevity]

FT   VARIANT     140    140       A -> T (IN ST JACQUES: O2 AFFINITY UP).
FT                                /FTId=VAR_003081.
FT   VARIANT     140    140       A -> V (IN PUTTELANGE; POLYCYTHEMIA;
FT                                O2 AFFINITY UP).
FT                                /FTId=VAR_003082.
FT   VARIANT     141    141       L -> R (IN OLMSTED; UNSTABLE).
FT                                /FTId=VAR_003083.
FT   VARIANT     142    142       A -> D (IN OHIO; O2 AFFINITY UP).
FT                                /FTId=VAR_003084.
FT   VARIANT     143    143       H -> D (IN RANCHO MIRAGE).
FT                                /FTId=VAR_003085.
FT   VARIANT     143    143       H -> Q (IN LITTLE ROCK; O2 AFFINITY UP).
FT                                /FTId=VAR_003086.
FT   VARIANT     143    143       H -> P (IN SYRACUSE; O2 AFFINITY UP).
FT                                /FTId=VAR_003087.
FT   VARIANT     143    143       H -> R (IN ABRUZZO; O2 AFFINITY UP).
FT                                /FTId=VAR_003088.
FT   VARIANT     144    144       K -> E (IN MITO; O2 AFFINITY UP).
FT                                /FTId=VAR_003089.
FT   VARIANT     145    145       Y -> C (IN RAINIER; O2 AFFINITY UP).
FT                                /FTId=VAR_003090.
FT   VARIANT     145    145       Y -> H (IN BETHESDA; O2 AFFINITY UP).
FT                                /FTId=VAR_003091.
FT   VARIANT     146    146       H -> D (IN HIROSHIMA; O2 AFFINITY UP).
FT                                /FTId=VAR_003092.
FT   VARIANT     146    146       H -> L (IN COWTOWN; O2 AFFINITY UP).
FT                                /FTId=VAR_003093.
FT   VARIANT     146    146       H -> P (IN YORK; O2 AFFINITY UP).
FT                                /FTId=VAR_003094.
FT   VARIANT     146    146       H -> Q (IN KODAIRA; O2 AFFINITY UP).
FT                                /FTId=VAR_003095.
FT   HELIX         5     15
FT   TURN         16     17
FT   HELIX        20     34
FT   HELIX        36     41
FT   HELIX        43     45
FT   HELIX        51     55
FT   TURN         56     56
FT   HELIX        58     75
FT   TURN         76     77
FT   HELIX        78     94
FT   TURN         95     96
FT   TURN        100    100
FT   HELIX       101    121
FT   HELIX       124    142
FT   TURN        143    144
SQ   SEQUENCE   146 AA;  15867 MW;  EC9744C9 CRC32;
     VHLTPEEKSA VTALWGKVNV DEVGGEALGR LLVVYPWTQR FFESFGDLST PDAVMGNPKV
     KAHGKKVLGA FSDGLAHLDN LKGTFATLSE LHCDKLHVDP ENFRLLGNVL VCVLAHHFGK
     EFTPPVQAAY QKVVAGVANA LAHKYH
//

Output file format

   An image is output to the specified graphics device.

  Output files for usage example

  Graphics File: pepwheel.ps

   [pepwheel results]

Data files

   None.

Notes

   The default settings for turn (5) and steps (18) apply to alpha
   helices. For other possible secondary structures, see the following
   table:

helix       phi   psi  omega  res/turn  transl.  turns  steps
alpha       -57   -47    180       3.6     1.50      5     18
3-10        -49   -26    180       3.0     2.00      1      3
pi          -57   -70    180       4.4     1.15      5     22
PP I        -83   158      0       3.33    1.9       3     10
PP II       -78   149    180       3.0     3.12      1      3
PG II       -80   150    180       3.0     3.1       1      3
anti Beta  -139   135   -178       2.0     3.4       4      9
para Beta  -119   113    180       2.0     3.2       4      9

PP is polyproline
PG II is polyGlycine.

References

    1. Rachamandran and Sasisekharan, Adv. Protein Chem. 23:283-437, 1968
    2. IUPAC-IUB Commission on biochemical nomenclature, Biochemistry
       9:3471-3479, 1970

Warnings

   When you specify the number of turns and steps, be aware that you
   should remove common factors from these two numbers. For example, if
   you (for some improbable reason) wished to plot a wheel with 8 turns
   in 18 steps (2.25 residues per turn) you should remove the common
   factor (i.e. 2) and specify 4 turns in 9 steps.

Diagnostic Error Messages

   None.

Exit status

   0 upon successful completion.

Known bugs

   None.

See also

   Program name Description
   abiview Reads ABI file and display the trace
   cirdna Draws circular maps of DNA constructs
   garnier Predicts protein secondary structure
   helixturnhelix Report nucleic acid binding motifs
   hmoment Hydrophobic moment calculation
   lindna Draws linear maps of DNA constructs
   pepcoil Predicts coiled coil regions
   pepnet Displays proteins as a helical net
   prettyplot Displays aligned sequences, with colouring and boxing
   prettyseq Output sequence with translated ranges
   remap Display a sequence with restriction cut sites, translation etc
   seealso Finds programs sharing group names
   showalign Displays a multiple sequence alignment
   showdb Displays information on the currently available databases
   showfeat Show features of a sequence
   showseq Display a sequence with features, translation etc
   sixpack Display a DNA sequence with 6-frame translation and ORFs
   textsearch Search sequence documentation text. SRS and Entrez are
   faster!
   tmap Displays membrane spanning regions

Author(s)

   Alan Bleasby (ableasby © rfcgr.mrc.ac.uk)
   MRC Rosalind Franklin Centre for Genomics Research Wellcome Trust
   Genome Campus, Hinxton, Cambridge, CB10 1SB, UK

History

   Written (March 1999) - Alan Bleasby

Target users

   This program is intended to be used by everyone and everything, from
   naive users to embedded scripts.

Comments

   None
