This is a multigene family of molybdenum-pterin binding proteins of about 70 amino acids in <taxon tax_id="1501">Clostridium pasteurianum</taxon>, as a tandemly-repeated domain C-terminal to an unrelated domain in ModE, a molybdate transport gene repressor of <taxon tax_id="562">Escherichia coli</taxon>, and in single or tandemly paired domains in several related proteins. Molybdenum-pterin binding