Abstract
Implication of calmodulin ( CaM) in breast cancer development has been proposed, justifying the interest for ER/calmodulin interaction. The association of the synthetic peptide ERα17p (H–PLMIKRSKKNSLALSLT–OH), which corresponds to the known ER interaction site of CaM, was investigated. Under physiologically conditions, 1:1 complex formation was observed using an ESI-ITMS instrument. This equimolar complex with CaM was only formed in presence of calcium. The binding of ERα17p to CaM is probably due to presence of four basic residues (K 299RSKK 303) in its sequence. Its relative binding affinity in solution by ESI-MS was evaluated by performing competitive binding experiments with other peptides more (ERα17pKR: KRSKR) or less basic (ERα17pAA: KRSAA) than ERα17p as well as Melittin (Mel), selected as a reference peptide since it is known to form a high-affinity complex with CaM. Relative affinities of these peptides for CaM were classified in the following decreasing order: Mel > ERα17pKR ∼ ERα17p ≫ ERα17pAA. Interestingly, another ion series showing two peptides for one protein was detected. The specificity of this complex not often reported for Melittin is discussed.
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