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Bioinformatics Advance Access published online on November 5, 2004

Bioinformatics, doi:10.1093/bioinformatics/bti125
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Received July 7, 2004
Revised October 18, 2004
Accepted November 2, 2004

Article

Protein homology detection by HMM-HMM comparison

Johannes Söding 1*

1 Department of Protein Evolution, Max-Planck-Institute for Developmental Biology, Spemannstrasse 35, D-72076 Tübingen, Germany

* To whom correspondence should be addressed.
Johannes Söding, E-mail: johannes.soeding{at}tuebingen.mpg.de


   Abstract

Motivation: Protein homology detection and sequence alignment are at the basis of protein structure prediction, function prediction, and evolution.

Results: We have generalized the alignment of protein sequences with a profile hidden Markov model (HMM) to the case of pairwise alignment of profile HMMs. We present a method for detecting distant homologous relationships between proteins based on this approach. The method (HHsearch) is benchmarked together with BLAST, PSI-BLAST, HMMER, and the profile-profile comparison tools PROF_SIM and COMPASS, in an all-against-all comparison of a database of 3691 protein domains from SCOP 1.63 with pairwise sequence identities below 20%.

Sensitivity: When predicted secondary structure is included in the HMMs, HHsearch is able to detect between 2.7 and 4.2 times more homologs than PSI-BLAST or HMMER and between 1.44 and 1.9 times more than COMPASS or PROF_SIM for a rate of false positives of 10%. Approximately half of the improvement over the profile-profile comparison methods is attributable to the use of profile HMMs in place of simple profiles.

Alignment quality: Higher sensitivity is mirrored by an increased alignment quality. HHsearch produced 1.2, 1.7, and 3.3 times more good alignments ("balanced" score > 0.3) than the next best method (COMPASS), and 1.6, 2.9, and 9.4 times more than PSI-BLAST, at the family, superfamily, and fold level.

Speed: HHsearch scans a query of 200 residues against 3691 domains in 33s on an AMD64 3GHz PC. This is 10 times faster than PROF_SIM and 17 times faster than COMPASS.

Availability: HHsearch can be downloaded from http://protevo.eb.tuebingen.mpg.de/download/ together with up-to-date versions of SCOP and PFAM. A web server is available at http://protevo.eb.tuebingen.mpg.de/toolkit/index.php?view=hhpred.


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[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
J. Jin, Y. Cai, T. Yao, A. J. Gottschalk, L. Florens, S. K. Swanson, J. L. Gutierrez, M. K. Coleman, J. L. Workman, A. Mushegian, et al.
A Mammalian Chromatin Remodeling Complex with Similarities to the Yeast INO80 Complex
J. Biol. Chem., December 16, 2005; 280(50): 41207 - 41212.
[Abstract] [Full Text] [PDF]


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J. Bacteriol.Home page
H. Neugebauer, C. Herrmann, W. Kammer, G. Schwarz, A. Nordheim, and V. Braun
ExbBD-Dependent Transport of Maltodextrins through the Novel MalA Protein across the Outer Membrane of Caulobacter crescentus
J. Bacteriol., December 15, 2005; 187(24): 8300 - 8311.
[Abstract] [Full Text] [PDF]


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J. Virol.Home page
K. Suhre
Gene and Genome Duplication in Acanthamoeba polyphaga Mimivirus
J. Virol., November 15, 2005; 79(22): 14095 - 14101.
[Abstract] [Full Text] [PDF]


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GeneticsHome page
J. Tilburn, J. C. Sanchez-Ferrero, E. Reoyo, H. N. Arst Jr., and M. A. Penalva
Mutational Analysis of the pH Signal Transduction Component PalC of Aspergillus nidulans Supports Distant Similarity to BRO1 Domain Family Members
Genetics, September 1, 2005; 171(1): 393 - 401.
[Abstract] [Full Text] [PDF]


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J. Biol. Chem.Home page
A. Gibson, A. P. Lewis, K. Affleck, A. J. Aitken, E. Meldrum, and N. Thompson
hCLCA1 and mCLCA3 Are Secreted Non-integral Membrane Proteins and Therefore Are Not Ion Channels
J. Biol. Chem., July 22, 2005; 280(29): 27205 - 27212.
[Abstract] [Full Text] [PDF]


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Nucleic Acids ResHome page
J. Soding, A. Biegert, and A. N. Lupas
The HHpred interactive server for protein homology detection and structure prediction
Nucleic Acids Res., July 1, 2005; 33(suppl_2): W244 - W248.
[Abstract] [Full Text] [PDF]


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BioinformaticsHome page
B. Schuster-Bockler and A. Bateman
Visualizing profile-profile alignment: pairwise HMM logos
Bioinformatics, June 15, 2005; 21(12): 2912 - 2913.
[Abstract] [Full Text] [PDF]



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