NMR reveals a different mode of binding of the Stam2 VHS domain to ubiquitin and diubiquitin.

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NMR reveals a different mode of binding of the Stam2 VHS domain to ubiquitin and diubiquitin.

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Torsion angles from chemical shifts:

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Secondary structure from chemical shifts:

CSI (via RCI server)

TALOS

MICS caps, β-turns

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PPM

CheShift-2- Cα

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Camcoil

Poulsen_rc_CS

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12-03-2010, 08:52 PM

nmrlearner

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NMR reveals a different mode of binding of the Stam2 VHS domain to ubiquitin and diubiquitin.

NMR reveals a different mode of binding of the Stam2 VHS domain to ubiquitin and diubiquitin.

Related Articles NMR reveals a different mode of binding of the Stam2 VHS domain to ubiquitin and diubiquitin.

Biochemistry. 2010 Dec 1;

Authors: Lange A, Hoeller D, Wienk H, Marcillat O, Lancelin JM, Walker O

The VHS domain of the Stam2 protein is a ubiquitin binding domain involved in the recognition of ubiquitinated proteins committed to lysosomal degradation. Among all VHS domains, the VHS domain of Stam proteins is the strongest binder to monoubiqiuitin and exhibits preferences for K63-linked chains. In the present paper, we report the solution NMR structure of the Stam2-VHS domain in complex with monoubiquitin by means of chemical shift perturbations, spin relaxation and paramagnetic relaxation enhancements. We also characterize the interaction of Stam2-VHS with K48- and K63-linked diubiquitin chains and report the first evidence that VHS binds differently to these two chains. Our data reveal that VHS enters the hydrophobic pocket of K48-linked diubiquitin and binds the two ubiquitin subunits with different affinities. In contrast, VHS interacts with K63-linked diubiquitin in a mode similar to its interaction with monoubiquitin. We also suggest possible structural models for both K48- and K63-linked diubiquitin in interaction with VHS. Our results, which demonstrate different mode of binding of VHS for K48- and K63-linked diubiquitin, may explain the preference of VHS for K63- over K48-linked diubiquitin chains and monoubiquitin.

PMID: 21121635 [PubMed - as supplied by publisher]

Source: PubMed

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