title: PHI-DAC: protein homology database through dihedral angle conservation.
abstract: Finding related conformations in the Protein Data Bank is essential in many areas of bioscience. To assist this task, we designed a dihedral angle database for searching protein segment homologs. The search engine relies on encoding of the protein coordinates into text characters representing amino acid sequence, φ and ψ dihedral angles. The search engine is advantageous owing to its high speed and interactive nature and is expected to assist scientists in discovering conformation homologs and evolutionary kinship. The search engine is fast, with query times lasting a few seconds, and freely available at http://tarshish.md.biu.ac.il/∼samsona.
  
  
  BACKGROUND
  Supplementary data are available at Bioinformatics online.
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Noa
authors.initials: N
authors.lastname: Maatuk
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Yitav
authors.initials: Y
authors.lastname: Glantz-Gashai
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Maya
authors.initials: M
authors.lastname: Rotman
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Meirav
authors.initials: M
authors.lastname: Baydany
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Gennadiy
authors.initials: G
authors.lastname: Fonar
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Amir
authors.initials: A
authors.lastname: Shechvitz
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Karin
authors.initials: K
authors.lastname: Shemer
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Aviva
authors.initials: A
authors.lastname: Peleg
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Eli
authors.initials: E
authors.lastname: Reuveni
authors.affiliation: Faculty of Medicine in the Galilee, Bar Ilan University, 13100 Safed, Israel.
authors.forename: Abraham O
authors.initials: AO
authors.lastname: Samson
mesh_terms: D000465:Algorithms; D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D003196:Computer Graphics; D030562:Databases, Protein; D008969:Molecular Sequence Data; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry*; D020539:Sequence Analysis, Protein / Q000379:methods*; D012984:Software
chemical_list: D011506:Proteins