- Structural Classification of Proteins
The Structural Classification of Proteins (SCOP) database is a largely manual classification of protein
structural domains based on similarities of their amino acidsequences and three-dimensional structures.
Originally published in 1995cite journal | author = Murzin AG, Brenner SE, Hubbard T, Chothia C | title = SCOP: a structural classification of proteins database for the investigation of sequences and structures | journal = J. Mol. Biol. | volume = 247 | issue = 4 | pages = 536–40 | year = 1995 | pmid = 7723011 | doi = 10.1006/jmbi.1995.0159 ] it is usually updated at least once yearly by
Alexei G. Murzinand his colleagues,cite journal | author = Lo Conte L, Brenner SE, Hubbard TJ, Chothia C, Murzin AG | title = SCOP database in 2002: refinements accommodate structural genomics | journal = Nucleic Acids Res. | volume = 30 | issue = 1 | pages = 264–7 | year = 2002 | pmid = 11752311 | doi = 10.1093/nar/30.1.264 ] cite journal | author = Andreeva A, Howorth D, Brenner SE, Hubbard TJ, Chothia C, Murzin AG | title = SCOP database in 2004: refinements integrate structure and sequence family data | journal = Nucleic Acids Res. | volume = 32 | issue = Database issue | pages = D226–9 | year = 2004 | pmid = 14681400 | doi = 10.1093/nar/gkh039 ] upon whose expertise the classification rests.
SCOP utilizes four levels of hierarchic structural classification:
# class - general "structural architecture" of the domain
# fold - similar arrangement of regular secondary structures but without evidence of evolutionary relatedness
# superfamily - sufficient structural and functional similarity to infer a divergent evolutionary relationship but not necessarily detectable sequence homology
# family - some sequence similarity can be detected.
Comparison to other classification systems
This classification is more significantly based on the human expertise than semi-automatic
CATH, its chief rival. It is usually accepted that SCOP provides a better justified classification. Human expertise is needed to decide whether certain proteins are evolutionary related and therefore should be assigned to the same superfamily, or their similarity is a result of structural constraints and therefore they belong to the same fold. Another database, FSSP, is purely automatically generated (including regular automatic updates) but offers no classification, allowing the user to draw their own conclusion as to the significance of structural relationships based on the pairwise comparisons of individual protein structures.
SCOP includes the following structural classes:
# α-helical domains
# β-sheet domains
# α/β domains which consist of from "beta-alpha-beta" structural units or "motifs" that form mainly parallel β-sheets
# α+β domains formed by independent α-helices and mainly antiparallel β-sheets
# multi-domain proteins
# membrane and cell surface proteins and
peptides (not including those involved in the immune system)
# "small" proteins
# low-resolution protein structures
# peptides and fragments
# designed proteins of non-natural sequence
Wikilinks to SCOP
To cite a particular SCOP page in Wikipedia, use the template of the form
|xxxxxx, where xxxxxx is a SCOP accession number, for instance SCOP|46456.
* [http://scop.mrc-lmb.cam.ac.uk/scop/ Structural Classification of Proteins]
* [http://navi.services.came.sbg.ac.at/bin/qCOPS.html qSCOP — SCOP Quantified by Structural Relationships]
* [http://supfam.org/SUPERFAMILY/ SUPERFAMILY] Library of HMMs representing SCOP superfamilies and database of (superfamily and family) annotations for all completely sequenced organisms
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