Words similar to protoporphyrin
Example sentences for: protoporphyrin
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Porphyrin designations are as follows: PP, protoporphyrin IX; HP, hematoporphyrin IX; TPP, meso -tetraphenylporphine; TNapPS, sulfonated 5,10,15,20-tetra-naphthalen-1-yl-porphyrin; TAnthPS, sulfonated 5,10,15,20-tetra-anthracen-9-yl-porphyrin.
, hydroxyethyl groups at the 2- and 4-positions, see CuHPIX in Figure 1) were found to be more active than structures with the protoporphyrin (see ZnPPIX in Figure 1), mesoporphyrin, deuteroporphyrin or deuteroporphyrin disulfonic acid rings (ethyl, hydrogen or sulfonate at positions 2 and 4, respectively).
The initial step of the insertion can proceed in the presence of either Mg.ATP or a non-hydrolyzable ATP-analog and involves oligomerization of the BchD and BchI subunits to form an oligomeric ring of AAA protomers that resembles the ring structure of NSF and other AAA proteins [ 14 32 ] . The second step of the insertion involves an obligatory hydrolysis of ATP that is tightly coupled with the transfer of the chelated Mg 2+to the protoporphyrin ring by BchH [ 49 ] . Although the details differ from midasin, particularly with respect to the subunit composition of the AAA ring, this chelation reaction provides a structural model suggesting that the function of the midasin M-domain may be to regulate the ATPase activity of the AAA protomers in the pseudo-hexameric ring and thus couple ATP hydrolysis to the binding of a protein ligand at the MIDAS site.
Approximately 20 natural porphyrins (based on the protoporphyrin ring skeleton of hemin) were evaluated.
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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