Accurate statistical model of comparison between multiple sequence alignments.
Accurate statistical model of comparison between multiple sequence alignments.
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DOI:
10.1093/nar/gkn065
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发表时间:
2008-04
影响因子:
14.9
通讯作者:
Grishin NV
中科院分区:
文献类型:
--
作者:
Sadreyev RI;Grishin NV
Comparison of multiple protein sequence alignments (MSA) reveals unexpected evolutionary relations between protein families and leads to exciting predictions of spatial structure and function. The power of MSA comparison critically depends on the quality of statistical model used to rank the similarities found in a database search, so that biologically relevant relationships are discriminated from spurious connections. Here, we develop an accurate statistical description of MSA comparison that does not originate from conventional models of single sequence comparison and captures essential features of protein families. As a final result, we compute E-values for the similarity between any two MSA using a mathematical function that depends on MSA lengths and sequence diversity. To develop these estimates of statistical significance, we first establish a procedure for generating realistic alignment decoys that reproduce natural patterns of sequence conservation dictated by protein secondary structure. Second, since similarity scores between these alignments do not follow the classic Gumbel extreme value distribution, we propose a novel distribution that yields statistically perfect agreement with the data. Third, we apply this random model to database searches and show that it surpasses conventional models in the accuracy of detecting remote protein similarities.
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DOI:
10.1016/s0097-8485(96)80004-0
发表时间:
1996-03-01
期刊:
COMPUTERS & CHEMISTRY
影响因子:
--
作者:
Gribskov, M;Robinson, NL
通讯作者:
Robinson, NL
影响因子:
14.9
作者:
Finn, Robert D.;Mistry, Jaina;Schuster-Bockler, Benjamin;Griffiths-Jones, Sam;Hollich, Volker;Lassmann, Timo;Moxon, Simon;Marshall, Mhairi;Khanna, Ajay;Durbin, Richard;Eddy, Sean R.;Sonnhammer, Erik L. L.;Bateman, Alex
通讯作者:
Bateman, Alex
影响因子:
2.9
作者:
Ohlson, T;Wallner, B;Elofsson, A
通讯作者:
Elofsson, A
影响因子:
14.9
作者:
Ginalski, K;von Grotthuss, M;Rychlewski, L
通讯作者:
Rychlewski, L
影响因子:
14.9
作者:
Ginalski, K;Pas, J;Rychlewski, L
通讯作者:
Rychlewski, L