You are using a version of Internet Explorer that may not display all features of this website. Please upgrade to a modern browser.
TrEMBL release 7.0
Published August 1, 1998
TrEMBL Release Notes Release 7, August 1998 EMBL Outstation European Bioinformatics Institute (EBI) Wellcome Trust Genome Campus Hinxton Cambridge CB10 1SD United Kingdom Telephone: (+44 1223) 494 444 Fax: (+44 1223) 494 468 Electronic mail address: DATALIB@EBI.AC.UK WWW server: http://www.ebi.ac.uk/ Amos Bairoch Swiss Institute of Bioinformatics (SIB) Centre Medical Universitaire 1, rue Michel Servet 1211 Geneva 4 Switzerland Telephone: (+41 22) 784 40 82 Fax: (+41 22) 702 55 02 Electronic mail address: BAIROCH@CMU.UNIGE.CH WWW server: http://www.expasy.ch/ Acknowledgements TrEMBL has been prepared by: o Rolf Apweiler, Sergio Contrino, Wolfgang Fleischmann, Henning Hermjakob, Vivien Junker, Stephanie Kappus, Fiona Lang, Michele Magrane, Maria Jesus Martin, Steffen Moeller, Nicoletta Mitaritonna and Claire O'Donovan at the EMBL Outstation - European Bioinformatics Institute (EBI) in Hinxton, UK; o Amos Bairoch and Alain Gateau at the Swiss Institute of Bioinformatics in Geneva, Switzerland. Notes This manual and the database it accompanies may be copied and redistributed freely, without advance permission, provided that this statement is reproduced with each copy. Citation If you want to cite TrEMBL in a publication please use the following reference: Bairoch A., and Apweiler R. The SWISS-PROT protein sequence data bank and its supplement TrEMBL in 1998. Nucleic Acids Res. 26:38-42(1998). 1. Introduction TrEMBL is a computer-annotated protein sequence database supplementing the SWISS-PROT Protein Sequence Data Bank. TrEMBL contains the translations of all coding sequences (CDS) present in the EMBL Nucleotide Sequence Database not yet integrated in SWISS-PROT. TrEMBL can be considered as a preliminary section of SWISS-PROT. For all TrEMBL entries which should finally be upgraded to the standard SWISS-PROT quality, SWISS-PROT accession numbers have been assigned. 2. Why a supplement to SWISS-PROT? The ongoing gene sequencing and mapping projects have dramatically increased the number of protein sequences to be incorporated into SWISS-PROT. We do not want to dilute the quality standards of SWISS-PROT by incorporating sequences without proper sequence analysis and annotation, but we do want to make the sequences available as fast as possible. TrEMBL achieves this second goal, and is a major step in the process of speeding up subsequent upgrading of annotation to the standard SWISS-PROT quality. To address the problem of redundancy, the translations of all coding sequences (CDS) in the EMBL Nucleotide Sequence Database already included in SWISS-PROT have been removed from TrEMBL. We name this supplement TrEMBL (Translation from EMBL), since the tools used to create the translations of the CDS are based on the program 'trembl' written by Thure Etzold at the EMBL. 3. The Release This TrEMBL release is created from the EMBL Nucleotide Sequence Database release 55 and contains 193'860 sequence entries, comprising 53'601'062 amino acids. To minimize redundancy, the translations of all coding sequences (CDS) in the EMBL Nucleotide Sequence Database already included in SWISS-PROT 36 have been removed from TrEMBL release 7. TrEMBL is split in two main sections; SP-TrEMBL and REM-TrEMBL: SP-TrEMBL (SWISS-PROT TrEMBL) contains the entries (165'420) which should be eventually incorporated into SWISS-PROT. SWISS-PROT accession numbers have been assigned for all SP-TrEMBL entries. SP-TrEMBL is organized in subsections: arc.dat (Archea): 7434 entries fun.dat (Fungi): 5261 entries hum.dat (Human): 6976 entries inv.dat (Invertebrates): 21991 entries mam.dat (Other Mammals): 2684 entries mhc.dat (MHC proteins): 3601 entries org.dat (Organelles): 12699 entries phg.dat (Bacteriophages): 1604 entries pln.dat (Plants): 12668 entries pro.dat (Prokaryotes): 35857 entries rod.dat (Rodents): 6346 entries unc.dat (Unclassified): 88 entries vrl.dat (Viruses): 44561 entries vrt.dat (Other Vertebrates): 3650 entries 16'379 new entries have been integrated in SP-TrEMBL. 580 sequences of SP-TrEMBL entries have been updated and in 54'681 cases the annotation has been updated. In the document deleteac.txt you will find a list of all accession numbers which appeared in the TrEMBL data bank, but have been deleted from the database. REM-TrEMBL (REMaining TrEMBL) contains the entries (28'440) that we do not want to include in SWISS-PROT.REM-TrEMBL entries have no accession numbers. This section is organized in five subsections: 1) Immunoglobulins and T-cell receptors (Immuno.dat) Most REM-TrEMBL entries are immunoglobulins and T-cell receptors. We stopped entering immunoglobulins and T-cell receptors into SWISS-PROT, because we only want to keep the germ line gene derived translations of these proteins in SWISS-PROT and not all known somatic recombinated variations of these proteins. We would like to create a specialized database dealing with these sequences as a further supplement to SWISS-PROT and keep only a representative cross-section of these proteins in SWISS-PROT. 2) Synthetic sequences (Synth.dat) Another category of data, which will not be included in SWISS-PROT are synthetic sequences. Again, we do not want to leave these entries in TrEMBL. Ideally one should build a specialized database for artificial sequences as a further supplement to SWISS-PROT. 3) Patent application sequences (Patent.dat) A third subsection consists of coding sequences captured from patent applications. A thorough survey of these entries have shown that apart from a rather small minority (which in most cases have already been integrated in SWISS-PROT), most of these sequences contain either erroneous data or concern artificially generated sequences outside the scope of SWISS-PROT. 4) Small fragments (Smalls.dat) Another subsection consists of fragments with less than eight amino acids. 5) CDS not coding for real proteins (Pseudo.dat) The last subsection consists of CDS translations where we have strong evidence to believe that these CDS are not coding for real proteins. 4. Format Differences Between SWISS-PROT and TrEMBL The format and conventions used by TrEMBL follow as closely as possible that of SWISS-PROT. Hence, it is not necessary to produce an additional user manual and extensive release notes for TrEMBL. The information given in the SWISS-PROT release notes and user manual are in general valid for TrEMBL. The differences are mentioned below. The general structure of an entry is identical in SWISS-PROT and TrEMBL. The data class used in TrEMBL (in the ID line) is always 'PRELIMINARY', whereas in SWISS-PROT it is always 'STANDARD'. Differences in line types present in SWISS-PROT and TrEMBL: The ID line (IDentification): The entry name used in SP-TrEMBL is the same as the Accession Number of the entry. The entry name used in REM-TrEMBL is the PID tagged to the corresponding CDS in the EMBL Nucleotide Sequence Database. 'PID' stands for the "Protein IDentification" number. It is a number that you will find in EMBL nucleotide sequence entries in a qualifier called "/db_xref" which is tagged to every CDS in the nucleotide database. Example: FT CDS 54..1382 FT /note="ribulose-1,5-bisphosphate carboxylase/ FT oxygenase activase precursor" FT /db_xref="PID:g1006835" The DT line (DaTe) The format of the DT lines that serve to indicate when an entry was created and updated are identical to that defined in SWISS-PROT; but the DT lines in TrEMBL are referring to the TEMBL release. The difference is shown in the example below. DT lines in a SWISS-PROT entry: DT 01-JAN-1988 (REL. 06, CREATED) DT 01-JUL-1989 (REL. 11, LAST SEQUENCE UPDATE) DT 01-AUG-1992 (REL. 23, LAST ANNOTATION UPDATE) DT lines in a TrEMBL entry: DT 01-NOV-1996 (TREMBLREL. 01, CREATED) DT 01-NOV-1996 (TREMBLREL. 01, LAST SEQUENCE UPDATE) DT 01-FEB-1997 (TREMBLREL. 02, LAST ANNOTATION UPDATE) 5. Weekly updates of TrEMBL and non-redundant data sets Weekly cumulative updates of TrEMBL are available by anonymous FTP and from the EBI SRS server. We also produce every week a complete non-redundant protein sequence collection by providing three compressed files (these are in the directory /pub/databases/sp_tr_nrdb on the EBI FTP server and in databases/sp_tr_nrdb on the ExPASy server): sprot.dat.Z, trembl.dat.Z and trembl_new.dat.Z. This set of non-redundant files is especially important for two types of users: (i) Managers of similarity search services. They can now provide what is currently the most comprehensive and non-redundant data set of protein sequences. (ii) Anybody wanting to update their full copy of SWISS-PROT + TrEMBL to their own schedule without having to wait for full releases of SWISS-PROT or of TrEMBL. 6. Access/Data Distribution FTP server: ftp.ebi.ac.uk/pub/databases/trembl SRS server: http://srs.ebi.ac.uk/ TrEMBL is also available on the SWISS-PROT CD-ROM. SWISS-PROT + TrEMBL is searchable on the following servers at the EBI: FASTA3 (http://www2.ebi.ac.uk/fasta3/) BLAST2 (http://www2.ebi.ac.uk/blast2/) Bic_sw (http://www2.ebi.ac.uk/bic_sw/) Scanps (http://www2.ebi.ac.uk/scanps/) SSearch (http://www2.ebi.ac.uk/ssearch3/) 7. Planned changes 7.1 Extension of the accession number system As explained in detail in the SWISS-PROT release notes under 2.3, we will extend the accession number system when we will have used up the 'O' series of accession numbers. This can be anticipated for January 1999. 7.2 Switch to the NCBI taxonomy To standardize the taxonomies used by different databases we will change with SWISS-PROT release release 37 and TrEMBL release 8 our taxonomy. We will switch to the NCBI taxonomy, which is already used as the common taxonomy by the DDBJ/EMBL/GenBank nucleotide sequence databases. 7.3 Introduction of RT lines With SWISS-PROT release release 37 and TrEMBL release 8 we will introduce a new line type, the RT (Reference Title) line. This optional line will be placed between the RA and RL line. The RT line gives the title of the paper (or other work) as exactly as possible given the limitations of the computer character set. The form which will be used is that which would be used in a citation rather than displayed at the top of the published paper. For instance, where journals capitalize major title words this is not preserved. The title is enclosed in double quotes, and may be continued over several lines as necessary. The title lines are terminated by a semicolon. An example of the use of RT lines is shown below: RT "Sequence analysis of the genome of the unicellular cyanobacterium RT Synechocystis sp. strain PCC6803. I. Sequence features in the 1 Mb RT region from map positions 64% to 92% of the genome.";