Haem disorder in two myoglobins: comparison of reorientation rate.

• Main Authors: BELLELLI, Andrea, BRUNORI, Maurizio, R. Foon, F. Ascoli
• Other Authors: Bellelli, Andrea, R., Foon, F., Ascoli, Brunori, Maurizio
• Format: Article in Journal/Newspaper
• Language: English
• Published: PORTLAND PRESS, 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ 1987
• Subjects: Sperm whale
• Online Access: http://hdl.handle.net/11573/457482; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=A1987K014200031&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=0c7ff228ccbaaa74236f48834a34396a; http://www.scopus.com/inward/record.url?eid=2-s2.0-0023656040&partnerID=65&md5=b3e3c197ad207c2328db9afc45ac6282

The globins from sperm whale and from Aplysia limacina myoglobins were reconstituted by addition of stoichiometric ferric protohaem and the Soret c.d. was followed as a function of time. For both reconstituted proteins, the Soret c.d. changes with time, reflecting haem reorientation inside its pocket, as previously described [Aojula, Wilson & Drake (1986) Biochem. J. 237, 613-616] for sperm whale myoglobin. The time course of the c.d. transition is found to be approx. 10 times faster in Aplysia than in sperm whale myoglobin, a result which is in agreement with the known structural and physicochemical properties of the two myoglobins; furthermore, these results confirm that c.d. and n.m.r. data on haem orientation in haemoproteins reflect the same molecular phenomenon.