A structural model for GroEL-polypeptide recognition. Export

@article{citeulike:2732785, abstract = {A monomeric peptide fragment of GroEL, consisting of residues 191-376, is a mini-chaperone with a functional chaperoning activity. We have solved the crystal structure at 1.7 A resolution of GroEL(191-376) with a 17-residue N-terminal tag. The N-terminal tag of one molecule binds in the active site of a neighboring molecule in the crystal. This appears to mimic the binding of a peptide substrate molecule. Seven substrate residues are bound in a relatively extended conformation. Interactions between the substrate and the active site are predominantly hydrophobic, but there are also four hydrogen bonds between the main chain of the substrate and side chains of the active site. Although the preferred conformation of a bound substrate is essentially extended, the flexibility of the active site may allow it to accommodate the binding of exposed hydrophobic surfaces in general, such as molten globule-type structures. GroEL can therefore help unfold proteins by binding to a hydrophobic region and exert a binding pressure toward the fully unfolded state, thus acting as an "unfoldase." The structure of the mini-chaperone is very similar to that of residues 191-376 in intact GroEL, so we can build it into GroEL and reconstruct how a peptide can bind to the tetradecamer. A ring of connected binding sites is noted that can explain many aspects of substrate binding and activity.}, address = {Cambridge University Chemical Laboratory, Medical Research Council Centre, United Kingdom.}, author = {Buckle, A. M. and Zahn, R. and Fersht, A. R.}, citeulike-article-id = {2732785}, citeulike-linkout-0 = {http://www.pnas.org/content/94/8/3571.abstract}, citeulike-linkout-1 = {http://www.pnas.org/content/94/8/3571.full.pdf}, citeulike-linkout-2 = {http://view.ncbi.nlm.nih.gov/pubmed/9108017}, citeulike-linkout-3 = {http://www.hubmed.org/display.cgi?uids=9108017}, day = {15}, issn = {0027-8424}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, keywords = {chaperonin, groel}, month = {April}, number = {8}, pages = {3571--3575}, posted-at = {2008-12-16 01:13:51}, priority = {2}, title = {A structural model for GroEL-polypeptide recognition.}, url = {http://www.pnas.org/content/94/8/3571.abstract}, volume = {94}, year = {1997} }

TY - JOUR ID - citeulike:2732785 L3 - citeulike-article-id:2732785 N2 - A monomeric peptide fragment of GroEL, consisting of residues 191-376, is a mini-chaperone with a functional chaperoning activity. We have solved the crystal structure at 1.7 A resolution of GroEL(191-376) with a 17-residue N-terminal tag. The N-terminal tag of one molecule binds in the active site of a neighboring molecule in the crystal. This appears to mimic the binding of a peptide substrate molecule. Seven substrate residues are bound in a relatively extended conformation. Interactions between the substrate and the active site are predominantly hydrophobic, but there are also four hydrogen bonds between the main chain of the substrate and side chains of the active site. Although the preferred conformation of a bound substrate is essentially extended, the flexibility of the active site may allow it to accommodate the binding of exposed hydrophobic surfaces in general, such as molten globule-type structures. GroEL can therefore help unfold proteins by binding to a hydrophobic region and exert a binding pressure toward the fully unfolded state, thus acting as an "unfoldase." The structure of the mini-chaperone is very similar to that of residues 191-376 in intact GroEL, so we can build it into GroEL and reconstruct how a peptide can bind to the tetradecamer. A ring of connected binding sites is noted that can explain many aspects of substrate binding and activity. IS - 8 JF - Proceedings of the National Academy of Sciences of the United States of America SN - 0027-8424 AD - Cambridge University Chemical Laboratory, Medical Research Council Centre, United Kingdom. EP - 3575 TI - A structural model for GroEL-polypeptide recognition. VL - 94 SP - 3571 KW - chaperonin KW - groel AU - Buckle, AM AU - Zahn, R AU - Fersht, AR PY - 1997/04/15/ UR - http://www.pnas.org/content/94/8/3571.abstract ER -