- Alanyl-tRNA synthetase gene of the extreme acidophilic chemolithoautotrophic Thiobacillus ferrooxidans is highly homologous to alaS genes from all living kingdoms but cannot be transcribed from its promoter in Escherichia coli. Guiliani, N., Bengrine, A., Borne, F., Chippaux, M., Bonnefoy, V. Microbiology (Reading, Engl.) (1997)