ArticleActa crystallographica. Section F, Structural biology communications2026
Crystal structure of carbon-nitrogen hydrolase from Helicobacter pylori G27.
Article in Acta crystallographica. Section F, Structural biology communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Carbon-nitrogen hydrolases (CNHs) are members of the diverse nitrilase superfamily of enzymes that facilitate cellular adaptation to environmental stress by metabolizing nitrogen, detoxifying xenobiotics and catabolizing environmentally derived metabolites. Helicobacter pylori CNH (HpCNH) may contribute to metabolic flexibility under acid stress, detoxification of reactive nitrogen species or nutrient scavenging in the nutrient-limited gastric environment. Here, we report the 2.1 Å resolution crystal structure of a CNH from H. pylori strain G27 (PDB entry 6mg6). HpCNH adopts the characteristic nitrilase-superfamily αββα-sandwich core and contains the conserved catalytic cysteine typical of enzymatically active CNHs. The overall structure and active site of HpCNH are most similar to those of carbamoylputrescine amidohydrolase from the plant Medicago truncatula. Despite structural variations in loop regions, including near the active site, HpCNH retains the key residues required to bind putrescine and the prototypical N-carbamoylputrescine amidase active site.
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