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Molecular Dynamics Simulations of the Periplasmic Ferric-hydroxamate Binding Protein FhuD

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Abstract

FhuD is a periplasmic binding protein (PBP) that, under iron-limiting conditions, transports various hydroxamate-type siderophores from the outer membrane receptor (FhuA) to the inner membrane ATP-binding cassette transporter (FhuBC). Unlike many other PBPs, FhuD possesses two independently folded domains that are connected by an α-helix rather than two or three central β-strands. Crystal structures of FhuD with and without bound gallichrome have provided some insight into the mechanism of siderophore binding as well as suggested a potential mechanism for FhuD binding to FhuB. Since the α-helix connecting the two domains imposes greater rigidity on the structure relative to the β-strands in other ‘classical’ PBPs, these structures reveal no large conformational change upon binding a hydroxamate-type siderophore. Therefore, it is difficult to explain how the inner membrane transporter FhuB can distinguish between ferrichrome-bound and ferrichrome-free FhuD. In the current study, we have employed a 30 ns molecular dynamics simulation of FhuD with its bound siderophore removed to explore the dynamic behavior of FhuD in the substrate-free state. The MD simulation suggests that FhuD is somewhat dynamic with a C-terminal domain closure of 6° upon release of its siderophore. This relatively large motion suggests differences that would allow FhuB to distinguish between ferrichrome-bound and ferrichrome-free FhuD.

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Authors and Affiliations

  1. Structural Biology Research Group, Department of Biological Sciences, University of Calgary, 2500 University Drive N.W, T2N 1N4, Alberta, Calgary, Canada

    Karla D. Krewulak, Craig M. Shepherd & Hans J. Vogel

  2. The Scripps Research Institute, TPC-6 10550 N. Torrey Pines Road, La Jolla, CA, U.S.A.

    Craig M. Shepherd

Authors
  1. Karla D. Krewulak
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  2. Craig M. Shepherd
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  3. Hans J. Vogel
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Correspondence to Hans J. Vogel.

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Krewulak, K.D., Shepherd, C.M. & Vogel, H.J. Molecular Dynamics Simulations of the Periplasmic Ferric-hydroxamate Binding Protein FhuD. Biometals 18, 375–386 (2005). https://doi.org/10.1007/s10534-005-3712-z

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