show Abstracthide Abstract<P><B><I>Alicyclobacillus acidocaldarius</I> subsp. <I>acidocaldarius</I> DSM 446</B>. <I>Alicyclobacillus acidocaldarius</I> subsp. <I>acidocaldarius</I> DSM 446 was isolated from an acidic hot spring. This organism is both thermophilic and acidophilic and produces heat and acid stable enzymes, such as amylase and esterase, which may be important in industry. This is the type strain and the genome sequence will provide information on the production and regulation of these proteins as well as on the adaptations necessary for life in a hot, acidic environment.