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Example sentences for: moad
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A dimer of MoeB adenylates the MoaD subunits of molybdopterin synthase that, after the conversion of these AMP moieties to thiocarboxylates by a sulfurtransferase, goes on to convert precursor Z to molybdopterin (MPT) [ 5 6 ] . Molybdopterin synthase is a heterotetrameric protein composed of two units each of MoaD and MoaE.
In Ec-MoeB, β sheet 5 (residues 149-155 of Ec-MoeB, Figure 3) forms part of the pocket which accepts the C-terminal portion of MoaD, of which the terminal glycine is subsequently adenylated [ 7 ] . Ec-MoeB I155, located at the C-terminal end of this beta loop, is substituted in MoeBR proteins by Y and in MoeZ proteins by F or Y. These bulky substitutions may restrict access of the C-terminus of MoeD-like proteins and may indicate that a different type of substrate is adenylated by MoeBR and MoeZ.
The crystal structure of the E. coli MoeB-MoaD complex clearly shows the interaction between these two proteins and unambiguously confirms the adenylation role of MoeB [ 7 ] . After a thiocarboxylate moiety is formed on the terminal glycine of each MoaD subunit, the two sulfur atoms are transferred to precursor Z as sulfhydryl groups in a dithiolene configuration.