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Results 1 - 10 of 10
EC Number
Subunits
Commentary
Reference
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1 * 17000 (NapB) + 1 * 90000 (NapA), the NapA holoenzyme associates with a di-heme c-type cytochrome redox partner (NapB). NapA and NapB proteins purify independently and not as a tight heterodimeric complex. Dissociation constants of 0.015 mM and 0.032 mM are determined for oxidized and reduced NapAB complexes, respectively
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x * 16000 + x * 90000, SDS-PAGE
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x * 90000 + x * 16000, two-subunit complex, NapA is an 90000 Da catalytic subunit which binds a bis-molybdenum guanosine dinucleoside cofactor and a [4Fe4S] cluster. NapB is an 16000 Da electron-transfer subunit, which in other bacteria binds two c-type haems
dimer
1 * 93000 + 1 * 16000, SDS-PAGE
heterodimer
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heterodimer
1 * 17000 + 1 * 87000, SDS-PAGE; 1 * 93309 + 1 * 18924, calculated from sequence
heterodimer
1 * 90000 (NapA) + 1 * 16000 (NapB), Nap activity is lost rapidly during the separation of NapA from NapB by anion exchange chromatography, SDS-PAGE
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PELDOR analysis of recombinant MTSL-labelled MalE-NapASP fusion mutant S4C/S24C alone or in complex with NapD, comparison of bound, NMR-derived NapASP helix from PDB ID 2PQ4 versus free generated helix, positions of the spin labels in the two conformations of the signal peptide, overview
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the catalytic subunit of Nap is usually encoded in a nap operon together with accessory proteins involved in its maturation (chaperones) and redox proteins that transfer reducing equivalents from the physiological electron donor (quinone pool) to the active site of the enzyme, nap enzyme domain structure analysis, overview
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the nap operon of Escherichia coli K-12, encoding a periplasmic nitrate reductase, encodes seven proteins. The catalytic complex in the periplasm, NapA–NapB receives electrons from the quinol pool via the membrane-bound cytochrome NapC. Like NapA, B and C, NapD, is also essential for Nap activity. None of the remaining three polypeptides, NapF, G and H, which are predicted to encode non-heme, iron-sulfur proteins, are essential for Nap activity
Results 1 - 10 of 10