Sandbox Reserved 773: Difference between revisions

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== Sequence and Structure ==
== Sequence and Structure ==


Histidine Decarboxylase is considered to be a homo-dimer when one observe its [[biological assembly]] <ref name=mast/>. A homodimer is a [[quaternary structure]] formed by two identical monomers or protein chains. In human, three human HDC (hHDC) homodimers can be joined together to form a trimer [[asymmetric unit]] <ref name=jbc/> <ref name=xray>PMID: 22684068</ref>. Thus, one can use the nomenclature “trimer of dimer” to suggest the complex might dissociate into smaller subunits before dissociating into monomers. The asymmetrical unit can be seen in Figure 1. Specifically, <scene name='56/564049/Cys180/1'>Cys-180</scene> and <scene name='56/564049/Cys418/1'>Cys-418</scene> are primary responsible for the oligomerization process of HDC <ref name=xray/>.
Histidine Decarboxylase is considered to be a homo-dimer when one observe its [[biological assembly]] <ref name=mast/>. A homodimer is a [[quaternary structure]] formed by two identical monomers or protein chains. In human, three human HDC (hHDC) homodimers can be joined together to form a trimer in the [[asymmetric unit]] which can be seen in the 3D <scene name='56/564049/Front/1'>model</scene> <ref name=jbc/> <ref name=xray>PMID: 22684068</ref>. Thus, one can use the nomenclature “trimer of dimer” to suggest the complex might dissociate into smaller subunits before dissociating into monomers. Specifically, <scene name='56/564049/Cys180/1'>Cys-180</scene> and <scene name='56/564049/Cys418/1'>Cys-418</scene> are found to account for the oligomerization process of the HDC complex<ref name=xray/>.