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Influence of allosteric effectors on the heme conformation of dromedary ferrous nitrosylhemoglobin detected by XANES spectroscopy

Congiu Castellano, A. ; Della Longa, S. ; Bianconi, A. ; [et al.]

Amsterdam : Elsevier

Biochimica et Biophysica Acta (BBA)/Protein Structure and Molecular 1080 (1991), S. 119-125

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ISSN: 0167-4838

Keywords: (C. dromedarius) ; Dromedary hemoglobin ; Ferrous nitrosylhemoglobin ; XANES spectroscopy

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Topics: Biology , Chemistry and Pharmacology , Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1016/0167-4838(91)90137-O

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XANES of carboxy and cyanomet-myoglobin The role of the distal histidine in the bent Fe−C−O configuration (1986)

Bianconi, A. ; Congiu-Castellano, A. ; Giovannelli, A. ; [et al.]

Springer

European biophysics journal 14 (1986), S. 7-10

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ISSN: 1432-1017

Keywords: Myoglobin ; XANES ; synchrotron radiation ; protein structure

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Physics

Notes: Abstract The ligand bonding geometry of carboxy-and cyanomet-myoglobin (MbCO and MbCN) has been measured by the XANES method (X-ray Absorption Near Edge Structure). A comparison between the ligand bonding geometry of carboxy- and cyanomet-myoglobin and of chelated protoheme methyl ester shows that the bent Fe−C−O configuration is the same in both systems. Therefore, we suggest that this configuration is not associated with any steric contraint imposed by the side chains of the aminoacid residues at the distal side of the heme pocket.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00260397

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Comparative XANES study of serotransferrin and ovotransferrin at Cu K-edge: evidence of interactions among the metal sites (2000)

Boffi, F. ; Ascone, I. ; Varoli Piazza, A. ; [et al.]

Springer

BioMetals 13 (2000), S. 217-222

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ISSN: 1572-8773

Keywords: copper site ; synchrotron radiation ; transferrins ; X-ray spectroscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract The Cu site structure of human serotransferrin and hen ovotransferrin using XANES spectroscopy has been investigated. Although the transferrin family proteins have been extensively studied, the results reported herein are the first concerning the structure of the metal site in C-terminal and N-terminal in the whole protein. Our structural data show that these proteins differ with regard to the independence of the two binding sites and the geometry of copper coordination, ranging from a poorly to a significantly distorted octahedron.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1009211820077

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Aluminum site structure in serum transferrin and lactoferrin revealed by synchrotron radiation X-ray spectroscopy (1997)

Congiu-Castellano, A. ; Boffi, F. ; Della Longa, S. ; [et al.]

Springer

BioMetals 10 (1997), S. 363-367

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ISSN: 1572-8773

Keywords: synchrotron radiation ; transferrins ; X-ray spectroscopy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract The Al site structure of serum transferrin and lactoferrin is investigated using X-ray absorption near edge structure (XANES) spectroscopy. Al K-edge spectra in the mono- and dialuminum forms of the proteins have been recorded for the first time. Our results show that the aluminium ion is hexa-coordinated in an octahedral-like symmetry and that the monoaluminum form, where only the C-terminal binding site is saturated, has an increased structural distortion around the metal site.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1018345021238

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Proximal and Distal Gastric Distension in Normal Subjects and H. pylori-Positive and -Negative Dyspeptic Patients and Correlation with Symptoms (1998)

Marzio, L. ; Falcucci, M. ; Grossi, L. ; [et al.]

Springer

Digestive diseases and sciences 43 (1998), S. 2757-2763

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ISSN: 1573-2568

Keywords: STOMACH ; DISTENSION ; WATER ; ULTRASONOGRAPHY ; DYSPEPSIA ; H. PYLORI

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Abstract Aim of the study was to analyze gastricdistension with water in H. pylori-positive and-negative dyspeptic patients and normal subjects and thecorrelation with symptoms. Twenty dyspeptic patients and 19 normal subjects were studied. H. pylori wasdetermined in each dyspeptic patient with the rapid ureatest at endoscopy. Gastric distension was evaluated byreal-time ultrasonography with the ingestion of stepwise-increasing amounts of water up toa total of 600 ml. During distension, the symptom scorewas evaluated as well. The proximal stomach wassignificantly smaller in dyspeptic patients than in healthy controls, at 100-600 ml water (P 〈0.01). A larger distal stomach was observed at 500 and600 ml of water (P 〈 0.01). The score of bloating andfullness was greater in dyspeptics than in controls at 300 and 600 ml of water distension.The symptoms score was linearly correlated with proximaland distal gastric measurements in dyspeptic patientsand in controls. No significant difference was found in dyspeptic patients regarding theH. pylori status. In conclusion, dyspeptic patients showa defective adaptation of the whole stomach to waterdistension and an increased symptom perception score as compared to controls. H. pyloriinfection does not seem to be a determining factor inthese observed findings.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1026628000491

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