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Cobamide remodeling
Journal article   Peer reviewed

Cobamide remodeling

Amy T Ma, Daniel S Kantner and Joris Beld
Vitamins and hormones, v 119, pp 43-63
2022
PMID: 35337629

Abstract

Cobamides - chemistry Cobamides - metabolism Humans Ligands Vitamin B 12 - metabolism
Cobamides are a family of structurally-diverse cofactors which includes vitamin B and over a dozen natural analogs. Within the nucleotide loop structure, cobamide analogs have variable lower ligands that fall into three categories: benzimidazoles, purines, and phenols. The range of cobamide analogs that can be utilized by an organism is dependent on the specificity of its cobamide-dependent enzymes, and most bacteria are able to utilize multiple analogs but not all. Some bacteria have pathways for cobamide remodeling, a process in which imported cobamides are converted into compatible analogs. Here we discuss cobamide analog diversity and three pathways for cobamide remodeling, mediated by amidohydrolase CbiZ, phosphodiesterase CbiR, and some homologs of cobamide synthase CobS. Remodeling proteins exhibit varying degrees of specificity for cobamide substrates, reflecting different strategies to ensure that imported cobamides can be utilized.

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Web of Science research areas
Biochemistry & Molecular Biology
Endocrinology & Metabolism
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