Sandbox Reserved 425: Difference between revisions
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==Overall Structure== | ==Overall Structure== | ||
In terms of secondary structure, FGFR in complex with Ponatinib consists of two domains, which is the characteristic structure exhibited by kinases. The N-terminal domain is the smaller of the two, and it contains a five-stranded beta sheet and an alpha helix. The larger C-terminal domain is primarily alpha helical in structure. A hinge links the two regions. A network of hydrogen-bonds between three conserved residues – Glu551, Asn535, and Lys627 – exists in the hinge region. This hydrogen-bonding controls the kinase activity of FGFR. | |||
In its active form, FGFR is dimerized and contains two activated intracellular substrates. The binding of a coreceptor, β-Klotho, stabilizes the activated complex. A DFG moiety is found in Bcr-Abl, the conformation of which plays a key role in binding Ponatinib. Another defining feature of active FGFR is its hydrophobic spine. Four residues in the spine – Leu536, Met524, His610, and Phe631 – are highly conserved. A gatekeeper residue is present at the beginning of the hinge, and interactions among the four hydrophobic spine residues link the gatekeeper to Tyr643 in the activation loop. This activation loop is glycine-rich and found in the kinase domain of FGFR. | |||
The structure is shown as follows: | |||
[[Image:StructureP.PNG]] | [[Image:StructureP.PNG]] | ||
