Crystal structure of nitrite bound Y323A mutant of haem-Cu containing nitrite reductase from Ralstonia pickettii

Unexpected Roles of a Tether Harboring a Tyrosine Gatekeeper Residue in Modular Nitrite Reductase Catalysis.

ASAKLPGDFGPPRGEPIHAVLTSPPLVPPPVNRTYPAKVIVELEVVEKEMQISEGVSYTFWTFGGTVPGSFIRVRQGDTV
EFHLKNHPSSKMPHNIDLHGVTGPGGGAASSFTAPGHESQFTFKALNEGIYVYHCATAPVGMHIANGMYGLILVEPPEGL
PKVDHEYYVMQGDFYTAGKYREKGLQPFDMEKAIDERPSYVLFNGAEGALTGDKALHAKVGETVRIFVGNGGPNLVSSFH
VIGAIFDQVRYEGGTNVQKNVQTTLIPAGGAAVVKFTARVPGSYVLVDHSIFRAFNKGAMAILKIDGAENKLVYSGKELD
SVALGDRAAPNMSAVTKATQASVSGTLTVQDQVQAGRALFAGTCSVCHQGNGAGLPGVFPPLAKSDFLAADPKRAMNIVL
HGLNGKIKVNGQEYDSVMPPMTQLNDDEVANILTYVLNSWDNPGGRVSAEDVKKVRAQPAPAKAVAEH

0.1M HEPES (pH7.5), 20% PEG 3350, 0.2 M Sodium citrate

Biotechnology and Biological Sciences Research Council

HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS

haem and Cu containing nitrite reductase, inter-copper electron transfer, METAL BINDING PROTEIN

ASAKLPGDFGPPRGEPIHAVLTSPPLVPPPVNRTYPAKVIVELEVVEKEMQISEGVSYTFWTFGGTVPGSFIRVRQGDTV
EFHLKNHPSSKMPHNIDLHGVTGPGGGAASSFTAPGHESQFTFKALNEGIYVYHCATAPVGMHIANGMYGLILVEPPEGL
PKVDHEYYVMQGDFYTAGKYREKGLQPFDMEKAIDERPSYVLFNGAEGALTGDKALHAKVGETVRIFVGNGGPNLVSSFH
VIGAIFDQVRYEGGTNVQKNVQTTLIPAGGAAVVKFTARVPGSYVLVDHSIFRAFNKGAMAILKIDGAENKLVYSGKELD
SVYLGDRAAPNMSAVTKATQASVSGTLTVQDQVQAGRALFAGTCSVCHQGNGAGLPGVFPPLAKSDFLAADPKRAMNIVL
HGLNGKIKVNGQEYDSVMPPMTQLNDDEVANILTYVLNSWDNPGGRVSAEDVKKVRAQPAPAKAVAEH

binding site for Di-peptide HEC I 503 and CYS I 364