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.
These critical residues lie close to the γ-phosphate site in other AAA proteins with known structures and they are believed to trigger a change in the angle between the N- and C-subdomains of the protomer upon binding of ATP or dissociation of the γ-phosphate [ 18 ] . Indirect evidence suggests that such a conformational change in one protomer can be communicated to the adjacent protomers and result in a cooperative alteration in the shape of the overall hexameric ring [ 19 ] .
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.
The polypeptide joining the adjacent AAA protomers in midasin is approximately 100 residues long between all protomer pairs.
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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