HD domains are metal dependent phosphohydrolases [1,2]. This entry covers the HD-GYP domain [2].

1: The HD domain defines a new superfamily of metal-dependent phosphohydrolases. Aravind L, Koonin EV; Trends Biochem Sci 1998;23:469-472. PMID:9868367

2: Sequence Conservation, Domain Architectures, and Phylogenetic Distribution of the HD-GYP Type c-di-GMP Phosphodiesterases. Galperin MY, Chou SH; J Bacteriol. 2021; [Epub ahead of print] PMID:34928179