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Background Hydroxysteroid dehydrogenase enzymes belong to the short-chain dehydrogenase/reductase (SDR) superfamily and aldo-keto reductases (AKRs). SDR is involved in the metabolism of many compounds (hormones, lipids, etc.) and is present in almost all studied genomes. Two hundred members of hydroxysteroid dehydrogenases have been analysed in terms of natural mutational variability. The second superfamily comprises AKR superfamily group enzymes whose function is catalysing the oxidation and reduction of many substrates by binding NAD(P)H as a cofactor. This kind of study is the first approach for the hydroxysteroid dehydrogenase family. This information grants practical meaning to designing potential specific drugs to fight specific diseases caused by mutations. Methods In the research, amino acid sequences of representatives of the hydroxysteroid dehydrogenase family were extracted from the UniProt database. In total, the analysed 200 sequences with the highest degree of similarity were shown by BLAST searches. In the sequence analyses, we used the following software: ClustalX (multiple sequence alignment), Consensus Constructor (creating consensus sequence), and CORM (finding correlated mutations). Results The CORM program identified potential sites of correlated mutations in hydroxysteroid dehydrogenases. This program generated 18 tables of results that contain the amino acid positions of mutations. Seven of these are presented in this paper. Conclusions The primary structure of the hydroxysteroid dehydrogenase family shows high variation.

Correlated mutations in hydroxysteroid dehydrogenases family