کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1936410 | 1050690 | 2008 | 6 صفحه PDF | دانلود رایگان |

Neuroglobin (Ngb) is a hexacoordinate globin expressed in the nervous system of vertebrates, involved in neuroprotection. O2 equilibrium measurements on mouse Ngb yielded significantly different P50 values, ranging from ∼2 torr to ∼10 torr. By a kinetic approach minimizing the effects of protein autoxidation, we measured P50 = 2.2 torr at 20 °C. As predicted from the structure, O2 binds to the Y44D Ngb mutant more quickly (k = 2.2 s−1 vs 0.15 s−1) and with slightly higher affinity (P50 = 1.3 torr) than wild-type. In addition, we introduced a novel reduction protocol for metNgb based on NADH:flavorubredoxin oxidoreductase (FlRd-red) from Escherichia coli, a candidate for the Ngb reducing activity recently identified in E. coli extracts. Interestingly, E. coli FlRd-red shares sequence similarity with the FAD-binding domain of the human apoptosis-inducing factor, a finding which may have unexpected significance with reference to the mechanism of neuroprotection by Ngb.
Journal: Biochemical and Biophysical Research Communications - Volume 367, Issue 4, 21 March 2008, Pages 893–898