𝔖 Bobbio Scriptorium
✦   LIBER   ✦

On the structure and function of cytochromeb-559

✍ Scribed by W. A. Cramer; S. M. Theg; W. R. Widger

Book ID
104627931
Publisher
Springer
Year
1986
Tongue
English
Weight
551 KB
Volume
10
Category
Article
ISSN
0166-8595

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✦ Synopsis

A summary of biochemical, biophysical, and molecular biological data is presented which led to the identification of two different polypeptides (a and fl, MW -9.16 and 4.27 kDa) in the cytochrome h-559 protein. The presence of a single His residue on each polypeptlde, and the conclusion from spectroscopy that the heme coordination must be bis-histidlne led to an obligatory requirement for coordination of a single heme through a heme cross-llnked dlmer. This structure does not have a precedent among soluble or membrane bound cytochromes. The possible participation of the cytochrome in the pathway of photoactivation is discussed.

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