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Licensed Unlicensed Requires Authentication Published by De Gruyter June 1, 2005

The periplasmic E. coli chaperone Skp is a trimer in solution: biophysical and preliminary crystallographic characterization

M. Schlapschy , M. K. Dommel , K. Hadian , M. Fogarasi , I.P. Korndörfer and A. Skerra
From the journal

Abstract

The 'seventeen kilodalton protein' Skp confers transient solubility on outer membrane proteins during biogenesis in Gram-negative bacteria. Here we report a first biophysical characterization of this chaperone itself, which also possesses biotechnological potential in the production of recombinant proteins. Using cross-linking and gel filtration methods, we found that Skp forms a stable homo-trimer in solution. Following thermal denaturation, monitored by CD spectroscopy, this chaperone refolds with high efficiency but exhibits a pronounced hysteresis between the un- and refolding transitions. Using the recombinant protein equipped with the Strep-tag II at its N-terminus, suitable crystallization conditions for Skp were found. A first data set was collected to 2.60 å resolution.

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Published Online: 2005-06-01
Published in Print: 2004-02-05

Copyright © 2004 by Walter de Gruyter GmbH & Co. KG

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