Interaction of SecB with intermediates along the folding pathway of maltose-binding protein.

Abstract

SecB, a molecular chaperone involved in protein export in Escherichia coli, displays the remarkable ability to selectively bind many different polypeptide ligands whose only common feature is that of being nonnative. The selectivity is explained in part by a kinetic partitioning between the folding of a polypeptide and its association with SecB. SecB has no affinity for native, stably folded polypeptides but interacts tightly with polypeptides that are nonnative. In order to better understand the nature of the binding, we have examined the interaction of SecB with intermediates along the folding pathway of maltose-binding protein. Taking advantage of forms of maltose-binding protein that are altered in their folding properties, we show that the first intermediate in folding, represented by the collapsed state, binds to SecB, and that the polypeptide remains active as a ligand until it crosses the final energy barrier to attain the native state. Study holds ProTherm entries: 7252, 7253, 7254, 7255 Extra Details: chaperones; folding intermediates; SecB

Submission Details

ID: cdgdSEXS

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:33 p.m.

Version: 1

Publication Details
Diamond DL;Strobel S;Chun SY;Randall LL,Protein Sci. (1995) Interaction of SecB with intermediates along the folding pathway of maltose-binding protein. PMID:7549876
Additional Information

Study Summary

Number of data points 6
Proteins Maltose-binding periplasmic protein ; Maltose-binding periplasmic protein
Unique complexes 3
Assays/Quantities/Protocols Experimental Assay: dG_H2O ; Experimental Assay: ddG_H2O ; Experimental Assay: dG_H2O
Libraries Mutations for sequence KIEEGKLVIWINGDKGYNGLAEVGKKFEKDTGIKVTVEHPDKLEEKFPQVAATGDGPDIIFWAHDRFGGYAQSGLLAEITPDKAFQDKLYPFTWDAVRYNGKLIAYPIAVEALSLIYNKDLLPNPPKTWEEIPALDKELKAKGKSALMFNLQEPYFTWPLIAADGGYAFKYENGKYDIKDVGVDNAGAKAGLTFLVDLIKNKHMNADTDYSIAEAAFNKGETAMTINGPWAWSNIDTSKVNYGVTVLPTFKGQPSKPFVGVLSAGINAASPNKELAKEFLENYLLTDEGLEAVNKDKPLGAVALKSYEEELAKDPRIAATMENAQKGEIMPNIPQMSAFWYAVRTAVINAASGRQTVDEALKDAQTRITK

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P
 

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)


Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Maltose-binding periplasmic protein P0AEY0 MALE_ECO57
100.0 Maltose-binding periplasmic protein P0AEX9 MALE_ECOLI
94.3 Maltose-binding periplasmic protein P19576 MALE_SALTY
93.9 Maltose-binding periplasmic protein P18815 MALE_KLEAE
90.7 Maltose-binding periplasmic protein P41130 MALE_PHOLU