Turning the growth hormone receptor on: evidence that hormone binding induces subunit rotation - PubMed (original) (raw)
. 2010 Apr;78(5):1163-74.
doi: 10.1002/prot.22636.
Affiliations
- PMID: 19927328
- DOI: 10.1002/prot.22636
Turning the growth hormone receptor on: evidence that hormone binding induces subunit rotation
David Poger et al. Proteins. 2010 Apr.
Abstract
Atomistic molecular dynamics simulations have been used to investigate the conformational changes associated with the binding of human growth hormone (hGH) to the extracellular domains (ECD) of the human growth hormone receptor (hGHR), thereby shedding light on the mechanism of activation. It is shown that the removal of hGH from the hormone-bound receptor complex results in a counter-clockwise rotation of the twosubunits relative to each other by 30 degrees -64 degrees (average 45 degrees +/- 14 degrees), in close agreement in terms of both the magnitude and direction of the rotation with that proposed based on mutagenesis experiments. In addition to providing evidence to support a rotational activation mechanism, the simulations have enabled the nature of the interaction interfaces in both the cytokine-bound and unliganded hGHR states to be analyzed in detail.
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