Structure of rat parvalbumlin with deleted AB domain:: Implications for the evolution of EF hand calcium-binding proteins and possible physiological relevance

Among the EF-hand Ca2+-binding proteins, parvalbumin (PV) and calbindin D9k (CaB) have the function of Ca2+ buffers. They evolved from an ancestor protein through two phylogenetic pathways, keeping one pair of EF-hands. They differ by the extra helix-loop-helix (AB domain) found in PV and by the linker between the binding sites. To investigate whether the deletion of AB in PV restores a CaB-like structure, we prepared and solved the structure of the truncated rat PV (PVrat Delta 37) by X-ray and NMR. PVrat Delta 37 keeps the PV fold, but is more compact, having a well-structured linker, which differs remarkably from CaB. Pvrat Delta 37 has no stable apo-form, has lower affinity for Ca2+ than full-length PV, and does not bind Mg2+, in contrast to CaB. Structural differences of the hydrophobic core are partially responsible for lowering the calcium-binding affinity of the truncated protein. It can be concluded that the AB domain, like the linker of CaB, plays a role in structural stabilization. The AB domain of PV protects the hydrophobic core, and is required to maintain high affinity for divalent cation binding. Therefore, the AB domain possibly modulates PV buffer function. (C) 2001 Wiley-Liss, Inc.