Exploring the folding energy landscape of a series of designed consensus tetratricopeptide repeat proteins Export

@article{citeulike:5908627, abstract = {10.1073/pnas.0907455106 Repeat proteins contain short, tandem arrays of simple structural motifs (20\^{a}ˆ’40 aa). These stack together to form nonglobular structures that are stabilized by short-range interactions from residues close in primary sequence. Unlike globular proteins, they have few, if any, long-range nonlocal stabilizing interactions. One ubiquitous repeat is the tetratricopeptide motif (TPR), a 34-aa helix-turn-helix motif. In this article we describe the folding kinetics of a series of 7 designed TPR proteins that are assembled from arraying identical designed consensus repeats (CTPRa). These range from the smallest 2-repeat protein to a large 10-repeat protein (\^{a}‰ˆ350 aa). In particular, we describe how the energy landscape changes with the addition of repeat units. The data reveal that although the CTPRa proteins have low local frustration, their highly symmetric, modular native structure is reflected in their multistate kinetics of unfolding and folding. Moreover, although the initial folding of all CTPRa proteins involves a nucleus with similar solvent accessibility, their subsequent folding to the native structure depends directly on repeat number. This corresponds to an increasingly complex landscape that culminates in CTPRa10 populating a misfolded, off-pathway intermediate. These results extend our current understanding of the malleable folding pathways of repeat proteins and highlight the consequences of adding identical repeats to the energy landscape.}, author = {Javadi, Yalda and Main, Ewan R. G.}, citeulike-article-id = {5908627}, citeulike-linkout-0 = {http://dx.doi.org/10.1073/pnas.0907455106}, citeulike-linkout-1 = {http://www.pnas.org/content/106/41/17383.abstract}, citeulike-linkout-2 = {http://www.pnas.org/content/106/41/17383.full.pdf}, citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/19805120}, citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=19805120}, day = {13}, doi = {10.1073/pnas.0907455106}, issn = {1091-6490}, journal = {Proceedings of the National Academy of Sciences}, keywords = {folding, kinetics, protein, repeat, structure, tetratricopeptide, tpr}, month = {October}, number = {41}, pages = {17383--17388}, posted-at = {2009-10-08 06:52:09}, priority = {3}, title = {Exploring the folding energy landscape of a series of designed consensus tetratricopeptide repeat proteins}, url = {http://dx.doi.org/10.1073/pnas.0907455106}, volume = {106}, year = {2009} }

TY - JOUR ID - citeulike:5908627 L3 - citeulike-article-id:5908627 N2 - 10.1073/pnas.0907455106 Repeat proteins contain short, tandem arrays of simple structural motifs (20−40 aa). These stack together to form nonglobular structures that are stabilized by short-range interactions from residues close in primary sequence. Unlike globular proteins, they have few, if any, long-range nonlocal stabilizing interactions. One ubiquitous repeat is the tetratricopeptide motif (TPR), a 34-aa helix-turn-helix motif. In this article we describe the folding kinetics of a series of 7 designed TPR proteins that are assembled from arraying identical designed consensus repeats (CTPRa). These range from the smallest 2-repeat protein to a large 10-repeat protein (≈350 aa). In particular, we describe how the energy landscape changes with the addition of repeat units. The data reveal that although the CTPRa proteins have low local frustration, their highly symmetric, modular native structure is reflected in their multistate kinetics of unfolding and folding. Moreover, although the initial folding of all CTPRa proteins involves a nucleus with similar solvent accessibility, their subsequent folding to the native structure depends directly on repeat number. This corresponds to an increasingly complex landscape that culminates in CTPRa10 populating a misfolded, off-pathway intermediate. These results extend our current understanding of the malleable folding pathways of repeat proteins and highlight the consequences of adding identical repeats to the energy landscape. IS - 41 JF - Proceedings of the National Academy of Sciences SN - 1091-6490 EP - 17388 TI - Exploring the folding energy landscape of a series of designed consensus tetratricopeptide repeat proteins VL - 106 SP - 17383 KW - folding KW - kinetics KW - protein KW - repeat KW - structure KW - tetratricopeptide KW - tpr AU - Javadi, Yalda AU - Main, Ewan PY - 2009/10/13/ UR - http://dx.doi.org/10.1073/pnas.0907455106 ER -