Reconstitution and characterization of a divergent plastocyanin from the photosynthetic prokaryote, Prochlorothrix hollandica, expressed in Escherichia coli.

Abstract:

:Plastocyanin (PC) is a copper protein that serves as a mobile electron carrier between cytochrome f and Photosystem I in the light reactions of photosynthesis. Despite large variability in amino acid sequences and isoelectric points, PCs from cyanobacterial and chloroplast sources reveal considerable similarities with respect to their secondary and tertiary structures. In this paper, we have expressed in Escherichia coli a PC from the prokaryote Prochlorothrix hollandica, and efficiently reconstituted the protein with copper under conditions yielding the characteristics of a native holoPC, as judged by redox titration (Eo' = +376 mV), near and far UV circular dichroism, and electron paramagnetic resonance (EPR) spectroscopy. By comparison of amino acid sequences, P. hollandica PC is the most divergent homolog identified to date, and analysis of this reconstituted preparation may reveal new insights as to the structural requirements for electron transport between the PC copper center and neighboring reaction partners.

authors

Babu CR,Arudchandran A,Hille R,Gross EL,Bullerjahn GS

doi

10.1006/bbrc.1997.6846

subject

Has Abstract

pub_date

1997-06-27 00:00:00

pages

631-5

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(97)96846-7

journal_volume

235

pub_type

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