Might be involved in cobalt reduction leading to cobalt(I) corrinoids. Cofactor biosynthesis; adenosylcobalamin biosynthesis. Belongs to the SIMIBI class G3E GTPase family. CobW subfamily. Was orginally thought to originate from Pseudomonas denitrificans, but similarity searches show that the sequence is much closer to Sinorhizobium. The entry's taxonomy has been changed.