Native-like structure of a protein-folding intermediate bound to the chaperonin GroEL.

The chaperonin GroEL binds nonnative proteins in its central channel through hydrophobic interactions and initiates productive folding in this space underneath bound co-chaperone, GroES, in the presence of ATP. The questions of where along the folding pathway a protein is recognized by GroEL, and how much structure is present in a bound substrate have remained subjects of discussion, with some experiments suggesting that bound forms are fully unfolded and others suggesting that bound species are partially structured. Here we have studied a substrate protein, human dihydrofolate reductase (DHFR), observing in stopped-flow fluorescence experiments that it can rapidly bind to GroEL at various stages of folding. We have also analyzed the structure of the GroEL-bound protein using hydrogen-deuterium exchange and NMR spectroscopy. The pattern and magnitude of amide proton protection indicate that the central parallel beta-sheet found in native DHFR is present in a moderately stable state in GroEL-bound DHFR. Considering that the strands are derived from distant parts of the primary structure, this suggests that a native-like global topology is also present. We conclude that significant native-like structure is present in protein-folding intermediates bound to GroEL.