Protein – Sequences, 3-D structure, interaction, …
System – Gene network, protein network, TFs, …
Other – Masspec, microarray, images, lab records, journals, literatures, …
The goal is to understand how the system works.
Myth2 : Data vs. Information Data Nucleotide – DNA, RNA, … Genome – Sequences, chromosomes, expressed data, … Protein – Sequences, 3-D structure, interaction, … System – Gene network, protein network, TFs, … Other – Masspec, microarray, images, lab records, journals, literatures, … Information Genotype Phenotype Genotype-Phenotype relationship SNPs Pathways Drug targets Getting data is “easy”, extracting information is hard!
What information do we want to extract? Total genetic difference (# of bases) is 4% 35 million single base substitutions plus 5 million insertions or deletions (indels) The average protein differs by only two amino acids, and 29% of proteins are identical. Genotype – Phenotype relationship!!! Science, 9/2/2005
Entrez is the integrated, text-based search and retrieval system used at NCBI for the major databases, including PubMed, Nucleotide and Protein Sequences, Protein Structures, Complete Genomes, Taxonomy, and others. Click on the graphic below for a more detailed view of Entrez integration.
accession number (GenBank) - The accession number is the unique identifier assigned to the entire sequence record when the record is submitted to GenBank. The GenBank accession number is a combination of letters and numbers that are usually in the format of one letter followed by five digits (e.g., M12345) or two letters followed by six digits (e.g., AC123456).
The accession number for a particular record will not change even if the author submits a request to change some of the information in the record. Take note that an accession number is a unique identifier for a complete sequence record, while a Sequence Identifier, such as a Version, GI, or ProteinID, is an identification number assigned just to the sequence data. The NCBI Entrez System is searchable by accession number using the Accession [ACCN] search field.
GI (GenBank) - A GI or "GenInfo Identifier" is a sequence identifier that can be assigned to a nucleotide sequence or protein translation. Each GI is a numeric value of one or more digits. The protein translation and the nucleotide sequence contained in the same record will each be assigned different GI numbers.
Every time the sequence data for a particular record is changed, its version number increases and it receives a new GI . However, while each new version number is based upon the previous version number, a new GI for an altered sequence may be completely different from the previous GI. For example, in the GenBank record M12345, the original GI might be 7654321, but after a change in the sequence is submitted, the new GI for the changed sequence could be 10529376. Individuals can search for nucleotide sequences and protein translations by GI using the UID search field in the NCBI sequence databases.
Begin with “>P1;” for protein sequence and “>N1;” for nucleotide.
GDE (.gde file)
Similar to FASTA file, begin with “%” instead of “>”.
Protein Databases UniProt is the uni versal prot ein database, a central repository of protein data created by combining Swiss-Prot , TrEMBL and PIR . This makes it the world's most comprehensive resource on protein information. The Protein Information Resource (PIR), located at Georgetown University Medical Center (GUMC), is an integrated public bioinformatics resource to support genomic and proteomic research, and scientific studies. Swiss-Prot is a curated biological database of protein sequences from different species created in 1986 by Amos Bairoch during his PhD and developed by the Swiss Institute of Bioinformatics and the European Bioinformatics Institute . Pfam is a large collection of multiple sequence alignments and hidden Markov models covering many common protein domains and families. PDB NCBI http://proteome.nih.gov/links.html
PubMed – Protein Databases The Protein database contains sequence data from the translated coding regions from DNA sequences in GenBank, EMBL, and DDBJ as well as protein sequences submitted to Protein Information Resource (PIR), SWISS-PROT, Protein Research Foundation (PRF), and Protein Data Bank (PDB) (sequences from solved structures). The Structure database or Molecular Modeling Database (MMDB) contains experimental data from crystallographic and NMR structure determinations. The data for MMDB are obtained from the Protein Data Bank (PDB). The NCBI has cross-linked structural data to bibliographic information, to the sequence databases, and to the NCBI taxonomy. Use Cn3D , the NCBI 3D structure viewer, for easy interactive visualization of molecular structures from Entrez. Tutorial: http://www.pdb.org/pdbstatic/tutorials/tutorial.html