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- W1971994501 abstract "GrpE acts as a nucleotide exchange factor for the Hsp70 chaperone system. Only one GrpE isoform is present in Escherichia coli, but for reasons not yet well understood, two GrpE isoforms have been found in mammalian mitochondria.Therefore, studies aimed at evaluating the physico-chemical characteristics of these proteins are important for the comprehension of the function of the Hsp70 chaperone system in different organisms. Here we report biophysical studies on human mitochondrial GrpE isoform 2. Small angle X-ray scattering measurements of human GrpE isoform 2 showed that this protein has a quaternary structure which is similar to those of human GrpE isoform 1 and E. coli GrpE: a dimer with a cruciform elongated shape. However, mitochondrial isoforms differed from each other regarding chemical and thermal denaturation profiles. This fact, combined with results of distinct expression patterns previously reported, point out that these proteins may have different response to external stimuli. Our results also indicate that human GrpE isoform 2 is more similar to the GrpE from E. coli than to human GrpE isoform 1. These results are relevant because differences in the conformation of Hsp70 co-chaperones are considered to be one of the reasons for functional diversity of this system." @default.
- W1971994501 created "2016-06-24" @default.
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- W1971994501 date "2006-05-01" @default.
- W1971994501 modified "2023-09-30" @default.
- W1971994501 title "Low resolution structure and stability studies of human GrpE#2, a mitochondrial nucleotide exchange factor" @default.
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- W1971994501 doi "https://doi.org/10.1016/j.abb.2006.02.015" @default.
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