Words similar to dhh
Example sentences for: dhh
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The hedgehog ( hh ) gene was identified two decades ago in Drosophila as a critical regulator of cell-fate determination during embryogenesis [ 1 ] . Subsequent work in several model systems has defined and characterized the Hh gene family that encodes highly conserved secreted signaling proteins (for review see [ 2 ] ). Hedgehog (Hh) proteins are synthesized as approximately 45 kDa precursors that autoprocess in an unprecedented fashion, resulting in the covalent attachment of a cholesterol moiety to the amino-terminal half of the precursor [ 2 ] . This processed amino-terminal domain, Hh-Np, is responsible for the activation of a unique and complex signaling cascade that is essential for controlling cell fate throughout development and into adulthood [ 2 ] . In mammals there are three Hh-family proteins: Sonic (Shh), Indian (Ihh), and Desert (Dhh).
Analogous active sites, that coordinate two metal ions, are observed in domains with similar activities, such as the classical adenylyl/guanylyl cyclases, family B DNA polymerases, pol-β fold nucleotidyl transferases, and triphosphatases or phosphoesterases of the HD and DHH superfamilies [ 11 15 19 20 ] . Consistent with these observations, both CyaB and ThTPase have been shown to require Mg 2+ions for their nucleotide cyclase and phosphatase activities [ 16 17 ] .
We postulate that these enzymes are likely to chelate 2 divalent cations and are likely follow a bimetal reaction mechanism similar to what has been proposed for nucleotide cyclases, nucleic acid polymerases, or certain phosphoesterases such as those of the HD and DHH superfamilies.
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