Abstract
Abstract Vitamin B12 derivatives play several central roles in the metabolism of micro organisms (Friedrich 1988; Dolphin 1982; Golding and Rao 1987), which are also believed to possess the capacity unique in nature to build up the B,2 structure. Corrinoids related to vitamin B12 appear to have a particularly essential function in some methanogenic, acetogenic, sulphur- and sulphate-reducing bacteria, where they have been assigned a role in the fixation of carbon dioxide via the recently discovered acetyl coenzyme A pathway (Fuchs 1986; Wood et al.1986; Thauer 1988; Ragsdale et al. 1990).
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