1qdb: Difference between revisions

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[[Image:1qdb.jpg|left|200px]]
{{Seed}}
[[Image:1qdb.png|left|200px]]


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{{STRUCTURE_1qdb|  PDB=1qdb  |  SCENE=  }}  
{{STRUCTURE_1qdb|  PDB=1qdb  |  SCENE=  }}  


'''CYTOCHROME C NITRITE REDUCTASE'''
===CYTOCHROME C NITRITE REDUCTASE===




==Overview==
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The enzyme cytochrome c nitrite reductase catalyses the six-electron reduction of nitrite to ammonia as one of the key steps in the biological nitrogen cycle, where it participates in the anaerobic energy metabolism of dissimilatory nitrate ammonification. Here we report on the crystal structure of this enzyme from the microorganism Sulfurospirillum deleyianum, which we solved by multiwavelength anomalous dispersion methods. We propose a reaction scheme for the transformation of nitrite based on structural and spectroscopic information. Cytochrome c nitrite reductase is a functional dimer, with 10 close-packed haem groups of type c and an unusual lysine-coordinated high-spin haem at the active site. By comparing the haem arrangement of this nitrite reductase with that of other multihaem cytochromes, we have been able to identify a family of proteins in which the orientation of haem groups is conserved whereas structure and function are not.
The line below this paragraph, {{ABSTRACT_PUBMED_10440380}}, adds the Publication Abstract to the page
(as it appears on PubMed at http://www.pubmed.gov), where 10440380 is the PubMed ID number.
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{{ABSTRACT_PUBMED_10440380}}


==About this Structure==
==About this Structure==
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[[Category: C-type cytochrome lysine-coordinated heme nitrite reductase]]
[[Category: C-type cytochrome lysine-coordinated heme nitrite reductase]]
[[Category: Oxidoreductase]]
[[Category: Oxidoreductase]]
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