Evidence for intramolecular disulfide bond shuffling in the folding of mutant human lysozyme.

Neuroglobin plays an important function in the supply of oxygen in nervous tissues. In human neuroglobin, a cysteine at position 46 in the loop connecting the C and D helices of the globin fold is presumed to form an intramolecular disulfide bond with Cys55. Rupture of this disulfide bridge stabilizes bi-histidyl haem hexacoordination, causing an overall decrease in the affinity for oxygen. Here, the first X-ray structure of wild-type human neuroglobin is reported at 1.74 Å resolution. This structure provides a direct observation of two distinct conformations of the CD region containing the intramolecular disulfide link and highlights internal cavities that could be involved in ligand migration and/or are necessary to enable the conformational transition between the low and high oxygen-affinity states following S—S bond formation.

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The crystal structures of oxidized forms of human peroxiredoxin 5 with an intramolecular disulfide bond confirm the proposed enzymatic mechanism for atypical 2-Cys peroxiredoxins

Archives of Biochemistry and Biophysics ◽

10.1016/j.abb.2008.04.036 ◽

2008 ◽

Vol 477 (1) ◽

pp. 98-104 ◽

Cited By ~ 27

Author(s):

Aude Smeets ◽

Cécile Marchand ◽

Dominique Linard ◽

Bernard Knoops ◽

Jean-Paul Declercq

Keyword(s):

Crystal Structures ◽

Disulfide Bond ◽

Enzymatic Mechanism ◽

Intramolecular Disulfide Bond

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2P206 The flagellar P-ring component protein FlgI of Escherichia coli : Analysis of its intramolecular disulfide bond and ring assembly

Seibutsu Butsuri ◽

10.2142/biophys.45.s171_2 ◽

2005 ◽

Vol 45 (supplement) ◽

pp. S171

Author(s):

Y. Hizukuri ◽

T. Yakushi ◽

I. Kawagishi ◽

M. Homma

Keyword(s):

Escherichia Coli ◽

Disulfide Bond ◽

Ring Assembly ◽

Intramolecular Disulfide Bond ◽

Component Protein

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A Periplasmic LolA Derivative with a Lethal Disulfide Bond Activates the Cpx Stress Response System

Journal of Bacteriology ◽

10.1128/jb.00821-10 ◽

2010 ◽

Vol 192 (21) ◽

pp. 5657-5662 ◽

Cited By ~ 11

Author(s):

Kazuyuki Tao ◽

Shoji Watanabe ◽

Shin-ichiro Narita ◽

Hajime Tokuda

Keyword(s):

Disulfide Bond ◽

Cell Envelope ◽

Two Component System ◽

Outer Membranes ◽

Inhibition Of Growth ◽

Atp Binding Cassette Transporter ◽

Intramolecular Disulfide Bond ◽

Envelope Stress ◽

Acyl Chains ◽

Stress Response System

ABSTRACT LolA accommodates the acyl chains of lipoproteins in its hydrophobic cavity and shuttles between the inner and outer membranes through the hydrophilic periplasm to place lipoproteins in the outer membrane. The LolA(I93C/F140C) derivative, in which Cys replaces Ile at position 93 and Phe at position 140, strongly inhibited growth in the absence of a reducing agent because of the lethal intramolecular disulfide bond between the two Cys residues. Expression of I93C/F140C was found to activate the Cpx two-component system, which responds to cell envelope stress. The inhibition of growth by I93C/F140C was partly suppressed by overproduction of LolCDE, which is an ATP-binding cassette transporter and mediates the transfer of lipoproteins from the inner membrane to LolA. A substantial portion of the oxidized form, but not the reduced one, of I93C/F140C expressed on LolCDE overproduction was recovered in the membrane fraction, whereas wild-type LolA was localized in the periplasm even when LolCDE was overproduced. Moreover, LolCDE overproduction stabilized I93C/F140C and therefore caused an increase in its level. Taken together, these results indicate that oxidized I93C/F140C stably binds to LolCDE, which causes strong envelope stress.

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