Mail server for protein functional domain homologies - ICGEB Trieste
pongor at genes.icgeb.trieste.it
Thu Dec 9 05:08:31 EST 1993
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This is the help file of the SBASE Email Server at the
International Centre for Genetic Engineering and Biotechnology
AREA Science Park, Padriciano 99, 34012 Trieste, Italy.
The SBASE Email Server is at present experimental. Please send comments
to sbase-comment at icgeb.trieste.it. Thanks.
The SBASE e-mail server accepts a specially formatted mail message
containing a protein query sequence, and, as a response, it sends the list
of the most probable domain homologies. A database search is performed
against the SBASE library of protein domains using the BLAST algorithm,
and the search results, provided with annotations, are returned in a mail
How to use:
This help file can be gotten by sending an email to
sbase at icgeb.trieste.it
containing the word HELP alone in the first line of the message body.
Making a QUERY:
Send e-mail to sbase at icgeb.trieste.it using the below example
Note: the parameters before the token BEGIN are optional, (here the
defaults are listed), the lines after BEGIN are required.
SCORE PARAMETER 35
Requests are handled immediately, in serial order. At present, response
time is quite short and is restricted by the network load rather than CPU
availability. Please note that large output files, such as sometimes occur
with very short query sequences, may need a long time to traverse the net.
Evaluation of the output:
The output of the server are BLAST search results against the SBASE
protein domain library. The output file contains the BLAST search
results, organized as follows:
1) List of the best scoring domain entries. As SBASE entries are named
by domain names (function, structure, etc.), this list already may give
some information on the expected domain composition.
2) List of alignments. For each SBASE entry you will find the complete
annotation of the domain, followed by one (or several) alignments with
(different parts of) the query. If one domain is found several times in
your query, you may find several alignments with the same or related
entries at different parts of the query. Please note that it depends on the
score parameter whether or not you see all the alignments. Do not use very
low cutoff values because that results in prohibitively long output
files. (For the time being, we have set the default cutoff to 35 and
the minimum cutoff to 30).
3) Run statistics. This is usually not essential for the evaluation of
the results; you can get a complete description of these and other blast
parameters by sending a HELP message to blast.ncbi.nlm.nih.gov
Important: Failure to see a homology with a known domain may be due to
several reasons: i) The domain type is not (yet) included in the SBASE
domain library; ii) The threshold score parameter was set too high for the
domain to be detected; iii) A different scoring matrix may be necessary in
order to detect the alignment with the domain type in question. In the present
experimental version of the SBASE server we support only the matrices used
by BLAST; "customized matrices" will be added later to the final version.
Papers to reference in reporting results:
Pongor, S., Skerl, V., Cserzo, M. and Hatsagi, Z., Simon, G. and
Bevilacqua, V. (1992): The SBASE domain library release 2.0& A
collection of annotated protein sequence segments, Nucleic Acids. Res ,
Altschul, Stephen F., Warren Gish, Webb Miller, Eugene W. Myers,
and David J. Lipman (1990) Basic local alignment search tool J. Mol.
The Sbase database is available by anonymous ftp at
The blast software is available by anonymous ftp at
Protection of your sequence data
The query sequences are not stored in any form.
Server functions: Zsolt Hatsagi
<hatsagi at icgeb.trieste.it>
Valeria Bevilacqua, systems manager
(valeria at icgeb.trieste.it)
General info: Sandor Pongor
<pongor at icgeb.trieste.it>
Mail: International Centre for Genetic Engineering
AREA Science Park, Padriciano 99
34012 Trieste, Italy
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