C-13- and Fe-57-NMR studies of the Fe - C - O unit of heme proteins and synthetic model compounds in solution: Comparison with IR vibrational frequencies and X-ray structural data
Φόρτωση...
Ημερομηνία
Συγγραφείς
Kalodimos, C. C.
Gerothanassis, I. P.
Hawkes, G. E.
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Wiley-Blackwell
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Biospectroscopy
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
C-13- and Fe-57-NMR spectra of several carbon monoxide hemoprotein models with varying polar and steric effects of the distal organic superstructure, constraints of the proximal side, and solvent polarity are reported. The C-13 shieldings of heme models cover a 4.0 ppm range that is extended to 7.0 ppm when several hemoglobin CO and myoglobin CO species at different pHs are included. Both heme models and heme proteins obey a similar excellent linear delta(C-13) versus nu(C-O) relationship that is primarily due to modulation of pi backbonding from Fe d(pi) to the CO pi* orbital by the distal pocket polar interactions. There is no direct correlation between delta(C-13) and Fe-C-O geometry. The poor monotonic relation between delta(C-13) and nu(Fe-C) indicates that the iron-carbon n bonding is not a primary factor influencing delta(C-13) and delta(Fe-57). The delta(Fe-57) was found to be extremely sensitive to deformation of the porphyrin geometry, and increased shielding by more than 600 ppm with increased ruffling was observed for various heme models of known X-ray structures. (C) 1998 John Wiley & Sons, Inc.
Περιγραφή
Λέξεις-κλειδιά
c-13-nmr, fe-57-nmr, nu(c--o) stretching vibration, nu(fe--c) stretching vibration, heme proteins, heme models, carbon-monoxide binding, resonance chemical-shifts, free-energy relationships, horseradish-peroxidase, pocket porphyrins, capped porphyrin, distal, ligand, myoglobin, raman
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000076309400007
http://onlinelibrary.wiley.com/store/10.1002/(SICI)1520-6343(1998)4:5%2B<S57::AID-BSPY7>3.0.CO;2-1/asset/7_ftp.pdf?v=1&t=hmn3lrj2&s=5302e784d174c6b94089c660dc4d6af99fd7a01b
http://onlinelibrary.wiley.com/store/10.1002/(SICI)1520-6343(1998)4:5%2B<S57::AID-BSPY7>3.0.CO;2-1/asset/7_ftp.pdf?v=1&t=hmn3lrj2&s=5302e784d174c6b94089c660dc4d6af99fd7a01b
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας