4xdi

<StructureSection load='4xdi' size='340' side='right' caption='[[4xdi]], [[Resolution|resolution]] 1.89&Aring;' scene=''>

<table><tr><td colspan='2'>[[4xdi]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Chlre Chlre]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4XDI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4XDI FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">THB1, CHLREDRAFT_81856 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=3055 CHLRE])</td></tr>

<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4xdi FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4xdi OCA], [http://pdbe.org/4xdi PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4xdi RCSB], [http://www.ebi.ac.uk/pdbsum/4xdi PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4xdi ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

THB1 is one of several group 1 truncated hemoglobins (TrHb1s) encoded in the genome of the unicellular green alga Chlamydomonas reinhardtii. THB1 expression is under the control of NIT2, the master regulator of nitrate assimilation, which also controls the expression of the only nitrate reductase in the cell, NIT1. In vitro and physiological evidence suggests that THB1 converts the nitric oxide generated by NIT1 into nitrate. To aid in the elucidation of the function and mechanism of THB1, the structure of the protein was solved in the ferric state. THB1 resembles other TrHb1s, but also exhibits distinct features associated with the coordination of the heme iron by a histidine (proximal) and a lysine (distal). The new structure illustrates the versatility of the TrHb1 fold, suggests factors that stabilize the axial ligation of a lysine, and highlights the difficulty of predicting the identity of the distal ligand, if any, in this group of proteins.

 

== References ==

[[Category: Chlre]]

[[Category: Bosch, J]]

[[Category: Boucher, L E]]

[[Category: Lecomte, J T.J]]

[[Category: Rice, S L]]

[[Category: Schlessman, J L]]

[[Category: Group 1 truncated hemoglobin]]

[[Category: Heme binding protein]]

[[Category: Trhbn]]