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- W2000948734 abstract "A method of identification of significant conservative and variable regions in homologous protein sequences is presented. A set of aligned homologous sequences is divided into two groups consisting of m and n most related sequences. Each pair of sequences from different group is compared using unitary similarity matrix. The superposition of pairwise comparisons scanned by a window of 10 amino acid residues gives intergroup local variability profile (VP). Area S of the figure between the VP and its mean value line is compared with averaged area S(r) of 1000 VPs of artificial homologous protein families. The difference (S-S(r)) given in standard deviation units sigma r is believed to be the amino acid substitution overall irregularity along the homologous protein sequences OI = (S-S(r))/sigma r. If OI greater than 2, the real VP extrema containing the surplus of area S-(S(r) + 2 sigma r) are cut off. The cut off stretches are likely to be significant conservative and variable regions. The significant conservative and variable regions of six homologous sequence families (phospholipases A2, cytochromes b, alpha-subunits of Na, K-ATPase, L- and M-subunits of photosynthetic bacteria photoreaction centre and human rhodopsins) were identified. It was shown that for artificial homologous protein sequences derived by k-fold lengthening of natural proteins the OI value rises as square root of k. To compare the degree of substitution irregularity in homologous protein sequence families of different length L the value of standard substitution overall irregularity for L = 250 is proposed." @default.
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- W2000948734 date "1992-06-01" @default.
- W2000948734 modified "2023-09-27" @default.
- W2000948734 title "The Significant Conservative and Variable Regions of the Homologous Protein Sequences" @default.
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- W2000948734 doi "https://doi.org/10.1080/07391102.1992.10507979" @default.
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