Words similar to protomer
Example sentences for: protomer
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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 COOH-end of the sixth protomer in the AAA domain is joined to the upstream end of the D/E-rich domain by a lengthy linker domain, ranging between 1700 and 2300 residues in most organisms.
Concomitant with this development of asymmetrical structure, the AAA1 protomer of the dynein motor unit evolved a functional dominance, in which it alone retains the full ability for binding and hydrolysis of ATP, while AAA2, AAA3 and AAA4 have lost the capability for hydrolysis and the most degenerate protomers AAA5 and AAA6 show no significant binding of ATP [ 20 21 22 ] . In midasin, the specialization of AAA protomers appears to have taken a less drastic course than in dynein.
The proteins of this family are unified by their sharing of a common structural organization that is based upon a conserved ATPase domain of ~225 residues referred to as an AAA protomer.
The BchI subunit also possesses a single AAA protomer, but contains no MIDAS domain [ 32 ] . The third subunit BchH is able to bind the protoporphyrin ring in either the presence or absence of ATP.
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