The Functional Significance of Protein Sequence Signatures

The adenosine triphosphate (ATP) binding cassette (ABC) transporter is a transporter in which its function transports many substrates across the membrane and ensures transcriptional and translational fidelity in an ATP-dependent manner (Jones & George, 2004). Since the information contained in the molecular arrangement defines their roles, these transporters can function. This information is usually in the form of motifs and is located in specific areas of their respective molecular arrays called domains.

PROSITE is a protein domain, family and functional site database containing biologically important protein sites, patterns and spectra. It analyzes the protein sequence of known motifs. PROSITE classification is based on observation. Similar protein sequences will be classified into families. And protein domains are classified based on families sharing common ancestry or having functional attributes. PROSITE records provide structural and functional information on specific proteins. It is part of ExPASy Proteomics Analysis Server and uses domain function annotations for SwissProt entries. At the moment, the latest version is version 20.91 released March 4, 2013, including 1661 entries, 1308 patterns, 1053 profile and 1057 ProRules.

When identifying possible functions of newly discovered proteins, the PROSITE database is used and the activity of known proteins is determined. To classify proteins, it is also possible to obtain characteristic or conserved sequences from proteins. This is because each PROSITE signature is linked to an annotated document containing all relevant information about a particular protein. PROSITE provides tools for motif detection and protein sequence analysis. The most common application or archive is a fingerprint that is used as evidence to identify an individual.

If the starting position of the protein coding region within the DNA sequence is known, the computer can generate a corresponding protein sequence consisting of amino acids using simple codes. Many sequence analysis programs use this translation method, so you can use a computer to process DNA sequences as virtual protein sequences.

Prions are proteins of a particular amino acid sequence, in particular conformation. They grow in host cells due to conformational changes in other protein molecules with the same amino acid sequence but have different conformations that are important or deleterious for the function of the organism. When protein changes to prion fold, its function changes. It can then pass the information to the new cell and reconfigure the more functional molecules of the sequence into alternating prion types. Depending on the type of fungal prion, this change is continuous and direct, the flow of information is protein → protein.