当前位置： SCI文献检索 > BIOCHEMISTRY期刊下所有文献 > Identification and characterization of PshB, the dicluster ferredoxin that harbors the terminal electron acceptors F(A) and F(B) in Heliobacterium modesticaldum.

Identification and characterization of PshB, the dicluster ferredoxin that harbors the terminal electron acceptors F(A) and F(B) in Heliobacterium modesticaldum.

Abstract：

:The Type I homodimeric photosynthetic reaction center found in anaerobic gram-positive bacteria of the genus Heliobacteriaceae incorporates FA- and FB-like iron-sulfur clusters similar to those found in Photosystem I as terminal electron acceptors. We recently isolated the PshB protein that harbors the iron-sulfur clusters from the reaction centers of Heliobacterium modesticaldum. Here, we report the cloning of a candidate gene and the properties of its product. Genuine PshB was dissociated from the reaction center with 1 M NaCl and purified using an affinity strategy. After acquiring its N-terminal amino acid sequence, an fd2-like gene encoding a 5.5-kDa dicluster ferredoxin was identified as a candidate for PshB. The Fd2-like apoprotein was expressed in Escherichia coli with a His tag, and the Fe/S clusters were inserted using inorganic reagents. The optical absorbance and EPR spectra of the Fd2-like holoprotein were similar to those of genuine PshB. The Fd2-like holoprotein was coeluted with P798-FX cores on both G-75 gel filtration and Ni affinity columns. Consistent with binding, the EPR resonances at g = 2.067, 1.933, and 1.890 from [FA/FB]- were restored after illumination at 15 K, and the long-lived, room-temperature charge recombination kinetics between P798+ and [FA/FB]- reappeared on a laser flash. These characteristics indicate that the long-sought gene and polypeptide harboring the FA- and FB-like clusters in heliobacteria have been identified. The amino acid sequence of PshB indicates an entirely different mode of binding with the reaction center core than PsaC, its counterpart in Photosystem I.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Heinnickel M,Shen G,Golbeck JH

doi

10.1021/bi0622165

subject

Has Abstract

pub_date

2007-03-06 00:00:00

pages

2530-6

issue

9

eissn

0006-2960

issn

1520-4995

journal_volume

46

pub_type

杂志文章

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