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Nucleic Acids Research, 2003, Vol. 31, No. 1 486-488
© 2003 Oxford University Press

Integration of related sequences with protein three-dimensional structural families in an updated version of PALI database

V. S. Gowri, Shashi B. Pandit, P. S. Karthik, N. Srinivasan* and S. Balaji

Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India

*To whom correspondence should be addressed. Tel: +91 803942837; Fax: +91 803600535/+91 803600683; Email: ns{at}mbu.iisc.ernet.in
Present address: P.S. Karthik, Biomedical and Biotechnological Center, Faculty of Chemistry and Mineralogy, University of Leipzig, Johannisallee 29, 04103 Leipzig, Germany

ABSTRACT

The database of Phylogeny and ALIgnment of homologous protein structures (PALI) contains three-dimensional (3-D) structure-dependent sequence alignments as well as structure-based phylogenetic trees of protein domains in various families. The latest updated version (Release 2.1) comprises of 844 families of homologous proteins involving 3863 protein domain structures with each of these families having at least two members. Each member in a family has been structurally aligned with every other member in the same family using two proteins at a time. In addition, an alignment of multiple structures has also been performed using all the members in a family. Every family with at least three members is associated with two dendrograms, one based on a structural dissimilarity metric and the other based on similarity of topologically equivalenced residues for every pairwise alignment. Apart from these multi-member families, there are 817 single member families in the updated version of PALI. A new feature in the current release of PALI is the integration, with 3-D structural families, of sequences of homologues from the sequence databases. Alignments between homologous proteins of known 3-D structure and those without an experimentally derived structure are also provided for every family in the enhanced version of PALI. The database with several web interfaced utilities can be accessed at: http://pauling.mbu.iisc.ernet.in/~pali.


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