Words similar to chelatase
Example sentences for: chelatase
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This basic domain organization shows a striking parallel to that of magnesium chelatase, a heterotrimeric enzyme containing BchD, BchI and BchH subunits, that performs ATP-dependent insertion of Mg 2+into the protoporphyrin IX ring in the course of chlorophyll biosynthesis [ 49 ] . In particular, the BchD subunit resembles midasin in possessing a single AAA protomer close to its NH 2 -terminus, together with a short aspartate-glutamate-rich region and a MIDAS-containing domain at its carboxy-terminus.
The residues in the MIDAS motifs lie on three closely apposed loops located on the upper edge of the β-sheet, where they form the metal-binding site, with oxygen atoms in the aspartate, serine and threonine residues coordinating the metal ion [ 9 ] . In integrin α2β1, which is a collagen receptor, the metal-binding site also binds the collagen ligand through the conserved glutamate in a GFOGER motif (O = hydroxyproline) completing the coordination sphere of the metal [ 28 ] . In vivo, the binding of collagen at this site appears to be regulated through a conformational shift in which the loops forming the MIDAS site change from a closed to an open conformation [ 29 30 31 ] . Other proteins containing a domain with all three MIDAS motifs include the D-subunit of magnesium chelatase [ 32 ] , Ca-activated chloride-channel protein [ 33 34 ] , nitrate reductase (accession AAC79447), and the D subunit of nitric oxide reductase (accession AAC45374).