N-lobe versus C-lobe complexation of bismuth by human transferrin
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چکیده
منابع مشابه
N-lobe versus C-lobe complexation of bismuth by human transferrin.
Interactions of recombinant N-lobe of human serum transferrin (hTF/2N) with Bi3+, a metal ion widely used in medicine, have been investigated by both UV and NMR spectroscopy. The bicarbonate-independent stability constant for Bi3+ binding (K*) to hTF/2N was determined to be log K* 18.9+/-0.2 in 5 mM bicarbonate/10 mM Hepes buffer at 310 K, pH7.4. The presence of Fe3+ in the C-lobe of intact hTF...
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Human serum transferrin (hTF) binds Fe(III) tightly but reversibly, and delivers it to cells via a receptor-mediated endocytosis process. The metal-binding and release result in significant conformational changes of the protein. Here, we report the crystal structures of diferric-hTF (Fe(N)Fe(C)-hTF) and bismuth-bound hTF (Bi(N)Fe(C)-hTF) at 2.8 and 2.4 Å resolutions respectively. Notably, the N...
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Transferrins bind ferric ion and deliver the iron to cells. The mechanism of the iron release has been studied kinetically, in vitro, with the aid of single point mutants in which the iron-binding ligand, Asp63 (aspartic acid-63, D63), has been changed to Ser, Asn, Glu and Ala. Iron release from the unmutated N-lobe of human serum transferrin (hTF/2N) by EDTA is influenced by a variety of facto...
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The complexation of Cm(III) with the recombinant N-lobe of human serum transferrin (hTf/2N) is investigated in the pH range from 4.0 to 11.0 using TRLFS. At pH ≥ 7.4 a Cm(III) hTf/2N species is formed with Cm(III) bound at the Fe(III) binding site. The results are compared with Cm(III) transferrin interaction at the C-lobe and indicate the similarity of the coordination environment of the C- an...
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Background: This study compares the clinical characteristics of patients with mesial temporal lobe epilepsy with hippocampal sclerosis (mTLE-HS) with those who have temporal lobe epilepsy (TLE) due to other etiologies. Methods : In this retrospective study all patients with a clinical diagnosis of TLE were recruited in a referral outpatient epilepsy clinic at Shiraz University of Medical Sc...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1999
ISSN: 0264-6021
DOI: 10.1042/0264-6021:3370105