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Determinants of neuroglobin plasticity highlighted by joint coarse-grained simulations and high pressure crystallography.


ABSTRACT: Investigating the effect of pressure sheds light on the dynamics and plasticity of proteins, intrinsically correlated to functional efficiency. Here we detail the structural response to pressure of neuroglobin (Ngb), a hexacoordinate globin likely to be involved in neuroprotection. In murine Ngb, reversible coordination is achieved by repositioning the heme more deeply into a large internal cavity, the "heme sliding mechanism". Combining high pressure crystallography and coarse-grain simulations on wild type Ngb as well as two mutants, one (V101F) with unaffected and another (F106W) with decreased affinity for CO, we show that Ngb hinges around a rigid mechanical nucleus of five hydrophobic residues (V68, I72, V109, L113, Y137) during its conformational transition induced by gaseous ligand, that the intrinsic flexibility of the F-G loop appears essential to drive the heme sliding mechanism, and that residue Val 101 may act as a sensor of the interaction disruption between the heme and the distal histidine.

SUBMITTER: Colloc'h N 

PROVIDER: S-EPMC5431840 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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Determinants of neuroglobin plasticity highlighted by joint coarse-grained simulations and high pressure crystallography.

Colloc'h Nathalie N   Sacquin-Mora Sophie S   Avella Giovanna G   Dhaussy Anne-Claire AC   Prangé Thierry T   Vallone Beatrice B   Girard Eric E  

Scientific reports 20170512 1


Investigating the effect of pressure sheds light on the dynamics and plasticity of proteins, intrinsically correlated to functional efficiency. Here we detail the structural response to pressure of neuroglobin (Ngb), a hexacoordinate globin likely to be involved in neuroprotection. In murine Ngb, reversible coordination is achieved by repositioning the heme more deeply into a large internal cavity, the "heme sliding mechanism". Combining high pressure crystallography and coarse-grain simulations  ...[more]

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