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AN ACID-STABLE CYTOCHROME IN IRON-OXIDIZING LEPTOSPIRILLUM-FERROOXIDANS

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UNSPECIFIED (1991) AN ACID-STABLE CYTOCHROME IN IRON-OXIDIZING LEPTOSPIRILLUM-FERROOXIDANS. FEMS MICROBIOLOGY LETTERS, 81 (1). pp. 89-94. ISSN 0378-1097.

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Abstract

A novel, apparently acid-stable cytochrome has been purified from Leptospirillum ferrooxidans in which it probably functions in the 'downhill' transfer of electrons from ferrous iron. It appeared to comprise a single polypeptide of apparent M(r) 17.9 kDa as determined by SDS-PAGE. Non-denaturing PAGE showed this to be the approximate size of the native protein. The oxidized cytochrome showed a broad absorption maximum at 422 nm and was readily reduced with dithionite or ferrous iron to give a form with absorption maxima at 440 and 579 nm. A mid-point potential of +680 mV at pH 3.5 was determined. Iron and zinc were found at concentrations approaching one atom of each per cytochrome molecule.

Item Type: Journal Article
Subjects: Q Science > QR Microbiology
Journal or Publication Title: FEMS MICROBIOLOGY LETTERS
Publisher: ELSEVIER SCIENCE BV
ISSN: 0378-1097
Official Date: 1 June 1991
Dates:
DateEvent
1 June 1991UNSPECIFIED
Volume: 81
Number: 1
Number of Pages: 6
Page Range: pp. 89-94
Publication Status: Published

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