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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Biophys+Rev 2018 ; 10 (2): 271-84 Nephropedia Template TP
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A role of heme side-chains of human hemoglobin in its function revealed by circular dichroism and resonance Raman spectroscopy #MMPMID29260461
Nagai M; Mizusawa N; Kitagawa T; Nagatomo S
Biophys Rev 2018[Apr]; 10 (2): 271-84 PMID29260461show ga
Structural changes of heme side-chains of human adult hemoglobin (Hb A) upon ligand (O2 or CO) dissociation have been studied by circular dichroism (CD) and resonance Raman (RR) spectroscopies. We point out the occurrence of appreciable deformation of heme side-chains like vinyl and propionate groups prior to the out-of-plane displacement of heme iron. Referring to the recent fine resolved crystal structure of Hb A, the deformations of heme side-chains take place only in the ? subunits. However, these changes are not observed in the isolated ? chain (?4 homotetramer) and, therefore, are associated with the ??? inter-subunit interactions. For the communications between ? and ? subunits in Hb A regarding signals of ligand dissociation, possible routes are proposed on the basis of the time-resolved absorption, CD, MCD (magnetic CD), and RR spectroscopies. Our finding of the movements of heme side-chains would serve as one of the clues to solve the cooperative O2 binding mechanism of Hb A.