Purification and characterization of 4-hydroxybenzoate 3-hydroxylase from a Klebsiella pneumoniae mutant strain

1995 ◽  
Vol 164 (1) ◽  
pp. 70-77
Author(s):  
Mónica Suárez ◽  
M. Martín ◽  
Estrella Ferrer ◽  
Amando Garrido-Pertierra
Keyword(s):  
Klebsiella Pneumoniae ◽  
Mutant Strain ◽  
Purification And Characterization

Purification and characterization of phytase from Klebsiella pneumoniae 9-3B

2012 ◽  
Vol 113 (5) ◽  
pp. 562-567 ◽  
Author(s):  
Lotis Escobin-Mopera ◽  
Midori Ohtani ◽  
Sachie Sekiguchi ◽  
Teruo Sone ◽  
Ayumi Abe ◽  
...  
Keyword(s):  
Klebsiella Pneumoniae ◽  
Purification And Characterization

scholarly journals Purification and characterization of the inactive MoFe protein (NifB-Kp1) of the nitrogenase from nifB mutants of Klebsiella pneumoniae

1983 ◽  
Vol 209 (1) ◽  
pp. 43-50 ◽  
Author(s):  
T R Hawkes ◽  
B E Smith
Keyword(s):  
Klebsiella Pneumoniae ◽  
Double Mutant ◽  
Specific Activity ◽  
Equimolar Amount ◽  
Wild Type ◽  
Purification And Characterization ◽  
Point Mutant ◽  
Mofe Protein ◽  
Iron Molybdenum Cofactor

The inactive MoFe protein of nitrogenase, NifB-Kp1, from two distinct nifB mutants of Klebsiella pneumoniae, Kp5058 (a nifB point mutant) and UNF1718 (a nifB, nifJ double mutant) has been purified and characterized. NifB-Kp1 can be activated by reaction with the iron-molybdenum cofactor, FeMoco, extracted from active MoFe protein. NifB-Kp1 purified from either source had similar properties and was contaminated with an approximately equimolar amount of protein of mol.wt. 21 000. Like active wild-type Kp1, it was an alpha 2 beta 2 tetramer, but it was far less stable than Kp1, deteriorating rapidly at temperatures above 8 degrees C or on mild oxidation. NifB-Kp1 preparations contained 0.4-0.9 Mo and 9.0 +/- 0.9 Fe atoms . mol-1 and, when activated by FeMoco, had a specific activity of approx. 500 units . mg-1. The Mo in our preparations was not associated with the e.p.r. signal normally observed from FeMoco. All preparations exhibited a weak gav. = 1.95 e.p.r. signal which was probably not associated with activatable protein.

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