biostudies-literatureUnknown37(4)Hung CPBacillus licheniformis γ-glutamyltranspeptidase (BlGGT) undergoes an autocatalytic process to generate 44.9 and 21.7 kDa subunits; however, a mutant protein (T399A) loses completely the processing ability and mainly exists as a precursor. For a comprehensive understanding of their structural features, the biophysical properties of these two proteins were investigated by circular dichroism and fluorescence spectroscopy. Tryptophan fluorescence and circular dichroism spectra were nearly identical for BlGGT and T399A, but unfolding analyses revealed that these two proteins had a different sensitivity towards temperature- and guanidine hydrochloride (GdnHCl)-induced denaturation. BlGGT and the unprocessed T399A displayed T(m) values of 61.4°C and 68.1°C, respectively, and thermal unfolding of Journal of biological physics463-75https://www.ebi.ac.uk/biostudies/studies/S-EPMC3169692biostudies-literatureUnfolding analysis of the mature and unprocessed forms of Bacillus licheniformis γ-glutamyltranspeptidase.PMC3169692Hung CPLin LLYang JCChen JHChi MCfalseUnfolding analysis of the mature and unprocessed forms of Bacillus licheniformis γ-glutamyltranspeptidase.Bacillus licheniformis γ-glutamyltranspeptidase (BlGGT) undergoes an autocatalytic process to generate 44.9 and 21.7 kDa subunits; however, a mutant protein (T399A) loses completely the processing ability and mainly exists as a precursor. For a comprehensive understanding of their structural features, the biophysical properties of these two proteins were investigated by circular dichroism and fluorescence spectroscopy. Tryptophan fluorescence and circular dichroism spectra were nearly identical for BlGGT and T399A, but unfolding analyses revealed that these two proteins had a different sensitivity towards temperature- and guanidine hydrochloride (GdnHCl)-induced denaturation. BlGGT and the unprocessed T399A displayed T(m) values of 61.4°C and 68.1°C, respectively, and thermal unfolding of 2011-01-01T00:00:00Z2011 Sep2025-05-29T21:10:19.182Z2025-05-29T21:10:19.182ZS-EPMC31696922294248810.1007/s10867-011-9228-6