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).
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.
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 ] .
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