sigcleave.txt

emboss的linux版本的源代码

                                 sigcleave 



Function

   Reports protein signal cleavage sites

Description

   Signal peptides mediate translocation across the ER membrane in
   eukaryotes. In prokaryotes signal peptides mediate translocation
   across the inner and outer membranes.

   sigcleave predicts the site of cleavage between a signal sequence and
   the mature exported protein. The predictive accuracy is estimated to
   be around 75-80% for both prokaryotic and eukaryotic proteins.

   sigcleave uses the method of von Heijne as modified by von Heijne in
   his later book where treatment of positions -1 and -3 in the matrix is
   slightly altered (see references).

  Why isn't there a cutoff to eliminate internal sites?

   The program predicts cleavage sites inside the whole protein. Apart
   from the N-terminal sites, the other sites are not biologically
   relevant. Why isn't there a cutoff to eliminate internal sites?

   The answer is partly because these sites can be relevant in some
   biological cases (additional pre-processing for example), but mostly
   because ...

   There is one thing in bioinformatics you can not be certain of ... the
   start of a protein sequence. The end is easy to predict. The start
   depends on promoters, transcriptional controls, splicing, etc.

   Most importantly, sigcleave is not perfect - you should check the
   results and decide whether you like the prediction.

   Also, remember you can put -send 50 on the command line to make sure
   it only checks the first 50 residues.

Usage

   Here is a sample session with sigcleave


% sigcleave 
Reports protein signal cleavage sites
Input protein sequence(s): tsw:ach2_drome
Minimum weight [3.5]: 
Output report [ach2_drome.sig]: 

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

Command line arguments

   Standard (Mandatory) qualifiers:
  [-sequence]          seqall     Protein sequence(s) filename and optional
                                  format, or reference (input USA)
   -minweight          float      [3.5] Minimum scoring weight value for the
                                  predicted cleavage site (Number from 0.000
                                  to 100.000)
  [-outfile]           report     [*.sigcleave] Output report file name

   Additional (Optional) qualifiers:
   -prokaryote         boolean    Specifies the sequence is prokaryotic and
                                  changes the default scoring data file name

   Advanced (Unprompted) qualifiers: (none)
   Associated qualifiers:

   "-sequence" associated qualifiers
   -sbegin1            integer    Start of each sequence to be used
   -send1              integer    End of each 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

   "-outfile" associated qualifiers
   -rformat2           string     Report format
   -rname2             string     Base file name
   -rextension2        string     File name extension
   -rdirectory2        string     Output directory
   -raccshow2          boolean    Show accession number in the report
   -rdesshow2          boolean    Show description in the report
   -rscoreshow2        boolean    Show the score in the report
   -rusashow2          boolean    Show the full USA in the report
   -rmaxall2           integer    Maximum total hits to report
   -rmaxseq2           integer    Maximum hits to report for one sequence

   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 dying program messages

Input file format

   sigcleave reads one or more protein sequence USAs.

  Input files for usage example

   'tsw:ach2_drome' is a sequence entry in the example protein database
   'tsw'

  Database entry: tsw:ach2_drome

ID   ACH2_DROME     STANDARD;      PRT;   576 AA.
AC   P17644;
DT   01-AUG-1990 (REL. 15, CREATED)
DT   01-AUG-1990 (REL. 15, LAST SEQUENCE UPDATE)
DT   01-NOV-1997 (REL. 35, LAST ANNOTATION UPDATE)
DE   ACETYLCHOLINE RECEPTOR PROTEIN, ALPHA-LIKE CHAIN 2 PRECURSOR.
GN   ACRE OR SAD OR ACR96AB.
OS   DROSOPHILA MELANOGASTER (FRUIT FLY).
OC   EUKARYOTA; METAZOA; ARTHROPODA; TRACHEATA; HEXAPODA; INSECTA;
OC   PTERYGOTA; DIPTERA; BRACHYCERA; MUSCOMORPHA; EPHYDROIDEA;
OC   DROSOPHILIDAE; DROSOPHILA.
RN   [1]
RP   SEQUENCE FROM N.A.
RC   TISSUE=HEAD;
RX   MEDLINE; 90301489.
RA   BAUMANN A., JONAS P., GUNDELFINGER E.D.;
RT   "Sequence of D alpha 2, a novel alpha-like subunit of Drosophila
RT   nicotinic acetylcholine receptors.";
RL   NUCLEIC ACIDS RES. 18:3640-3640(1990).
RN   [2]
RP   SEQUENCE FROM N.A.
RC   TISSUE=HEAD;
RX   MEDLINE; 90353591.
RA   JONAS P., BAUMANN A., MERZ B., GUNDELFINGER E.D.;
RT   "Structure and developmental expression of the D alpha 2 gene
RT   encoding a novel nicotinic acetylcholine receptor protein of
RT   Drosophila melanogaster.";
RL   FEBS LETT. 269:264-268(1990).
RN   [3]
RP   SEQUENCE FROM N.A.
RX   MEDLINE; 90360975.
RA   SAWRUK E., SCHLOSS P., BETZ H., SCHMITT B.;
RT   "Heterogeneity of Drosophila nicotinic acetylcholine receptors: SAD,
RT   a novel developmentally regulated alpha-subunit.";
RL   EMBO J. 9:2671-2677(1990).
CC   -!- FUNCTION: AFTER BINDING ACETYLCHOLINE, THE ACHR RESPONDS BY AN
CC       EXTENSIVE CHANGE IN CONFORMATION THAT AFFECTS ALL SUBUNITS AND
CC       LEADS TO OPENING OF AN ION-CONDUCTING CHANNEL ACROSS THE PLASMA
CC       MEMBRANE.
CC   -!- SUBCELLULAR LOCATION: INTEGRAL MEMBRANE PROTEIN.
CC   -!- TISSUE SPECIFICITY: CNS IN EMBRYOS.
CC   -!- DEVELOPMENTAL STAGE: LATE EMBRYONIC AND LATE PUPAL STAGES.
CC   -!- SIMILARITY: BELONGS TO THE LIGAND-GATED IONIC CHANNELS FAMILY.
CC   --------------------------------------------------------------------------
CC   This SWISS-PROT entry is copyright. It is produced through a collaboration
CC   between  the Swiss Institute of Bioinformatics  and the  EMBL outstation -
CC   the European Bioinformatics Institute.  There are no  restrictions on  its
CC   use  by  non-profit  institutions as long  as its content  is  in  no  way
CC   modified and this statement is not removed.  Usage  by  and for commercial
CC   entities requires a license agreement (See http://www.isb-sib.ch/announce/
CC   or send an email to [e-mail]).
CC   --------------------------------------------------------------------------
DR   EMBL; X52274; G7803; -.
DR   EMBL; X53583; G8533; -.
DR   PIR; S11679; ACFFA2.
DR   FLYBASE; FBgn0000039; nAcR-alpha-96Ab.
DR   PROSITE; PS00236; NEUROTR_ION_CHANNEL; 1.
DR   PFAM; PF00065; neur_chan; 1.
KW   RECEPTOR; POSTSYNAPTIC MEMBRANE; IONIC CHANNEL; GLYCOPROTEIN; SIGNAL;
KW   TRANSMEMBRANE; MULTIGENE FAMILY.
FT   SIGNAL        1     41       PROBABLE.
FT   CHAIN        42    576       ACETYLCHOLINE RECEPTOR PROTEIN, ALPHA-2.
FT   DOMAIN       42    261       EXTRACELLULAR (POTENTIAL).
FT   TRANSMEM    262    285       POTENTIAL.
FT   TRANSMEM    293    311       POTENTIAL.
FT   TRANSMEM    327    346       POTENTIAL.
FT   DOMAIN      347    526       CYTOPLASMIC (POTENTIAL).
FT   TRANSMEM    527    545       POTENTIAL.
FT   DISULFID    169    183       BY SIMILARITY.
FT   DISULFID    243    244       ASSOCIATED WITH RECEPTOR ACTIVATION
FT                                (BY SIMILARITY).
FT   CARBOHYD     65     65       POTENTIAL.
FT   CARBOHYD    254    254       POTENTIAL.
FT   CARBOHYD    570    570       POTENTIAL.
SQ   SEQUENCE   576 AA;  65506 MW;  7B795689 CRC32;
     MAPGCCTTRP RPIALLAHIW RHCKPLCLLL VLLLLCETVQ ANPDAKRLYD DLLSNYNRLI
     RPVSNNTDTV LVKLGLRLSQ LIDLNLKDQI LTTNVWLEHE WQDHKFKWDP SEYGGVTELY
     VPSEHIWLPD IVLYNNADGE YVVTTMTKAI LHYTGKVVWT PPAIFKSSCE IDVRYFPFDQ
     QTCFMKFGSW TYDGDQIDLK HISQKNDKDN KVEIGIDLRE YYPSVEWDIL GVPAERHEKY
     YPCCAEPYPD IFFNITLRRK TLFYTVNLII PCVGISYLSV LVFYLPADSG EKIALCISIL
     LSQTMFFLLI SEIIPSTSLA LPLLGKYLLF TMLLVGLSVV ITIIILNIHY RKPSTHKMRP
     WIRSFFIKRL PKLLLMRVPK DLLRDLAANK INYGLKFSKT KFGQALMDEM QMNSGGSSPD
     SLRRMQGRVG AGGCNGMHVT TATNRFSGLV GALGGGLSTL SGYNGLPSVL SGLDDSLSDV
     AARKKYPFEL EKAIHNVMFI QHHMQRQDEF NAEDQDWGFV AMVMDRLFLW LFMIASLVGT
     FVILGEAPSL YDDTKAIDVQ LSDVAKQIYN LTEKKN