Germline mutations in the BRCA1 tumor suppressor gene often result in a significant increase in susceptibility to breast and ovarian cancers. Although the molecular basis of their effects remains largely obscure, many mutations are known to target the highly conserved C-terminal BRCT repeats that function as a phosphoserine/phosphothreonine-binding module. We report the X-ray crystal structure at a resolution of 1.85 A of the BRCA1 tandem BRCT domains in complex with a phosphorylated peptide representing the minimal interacting region of the DEAH-box helicase BACH1. The structure reveals the determinants of this novel class of BRCA1 binding events. We show that a subset of disease-linked mutations act through specific disruption of phospho-dependent BRCA1 interactions rather than through gross structural perturbation of the tandem BRCT domains.[1]
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. Pathogenic mutations are shown in magenta, benign mutations are shown in green, residues with both pathogenic and benign mutations are shown in plum.
Pathogenic mutations
conformation and
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residues together, and an
between the two states. This mutation causes hydrogen bonds lost.
conformation and
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residues together, and an
between the two states. This mutation causes hydrogen bonds lost.
conformation and
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residues together, and an
between the two states. This mutation causes saltbridges lost, hydrogen bonds lost, overpacking, clashes; interaction lost with BRCA1 interacting protein C-terminal helicase 1.
conformation and
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residues together, and an
between the two states. This mutation causes overpacking, and forms new hydrogen bonds.
conformation and
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residues together, and an
between the two states. This mutation causes overpacking, and forms new hydrogen bond.
conformation and
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residues together, and an
between the two states. This mutation causes hydrogen bonds lost, overpacking.
conformation and
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residues together, and an
between the two states. This mutation causes overpacking.
conformation and
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residues together, and an
between the two states. This mutation causes overpacking.
conformation and
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residues together, and an
between the two states. This mutation probably decreased hydrophobic interaction.
conformation and
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residues together, and an
between the two states. Hydrogen bonding, salt bridging for mutant M1775R. Arg1775 participates in the coordination of two solvent
anions, S1 and S2, and has been flipped out from the hydrophobic pocket where Met1775 normally packs [2].
conformation and
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residues together, and an
between the two states.
