Journal
IUBMB LIFE
Volume 59, Issue 8-9, Pages 600-616Publisher
WILEY
DOI: 10.1080/15216540701308424
Keywords
O-2 carrier; myoglobin; neuroglobin; hemoglobin; erythrocruorin; chlorocruorin; hemerythrin; hemocyanin; red blood cell; ligand binding; molecular structure
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O-2 carriers ( extracellular and intracellular as well as monomeric and multimeric) have evolved over the last billion of years, displaying iron and copper reactive centers; very di. fferent O-2 carriers may coexist in the same organism. Circulating O-2 carriers, faced to the external environment, are responsible for maintaining an adequate delivery of O-2 to tissues and organs almost independently of the environmental O-2 partial pressure. Then, intracellular globins facilitate O-2 transfer to mitochondria sustaining cellular respiration. Here, molecular aspects of multiple strategies evolved for O-2 transport and delivery are examined, from the simplest myoglobin to the most complex giant O-2 carriers and the red blood cell, mostly focusing on the aspects which have been mainly addressed by the so called 'Rome Group'.
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