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• W2022115408 endingPage "1856" @default.
• W2022115408 startingPage "1845" @default.
• W2022115408 abstract "The present article reports a low molecular weight aspartic protease inhibitor, API, from a newly isolated thermo-tolerant Bacillus licheniformis. The inhibitor was purified to homogeneity as shown by rp-HPLC and SDS-PAGE. API is found to be stable over a broad pH range of 2–11 and at temperature 90 °C for 2 1/2 h. It has a Mr (relative molecular mass) of 1363 Da as shown by MALDI-TOF spectra and 1358 Da as analyzed by SDS-PAGE .The amino acid analysis of the peptide shows the presence of 12 amino acid residues having Mr of 1425 Da. The secondary structure of API as analyzed by the CD spectra showed 7% α-helix, 49% β-sheet and 44% aperiodic structure. The Kinetic studies of Pepsin–API interactions reveal that API is a slow-tight binding competitive inhibitor with the IC50 and Ki values 4.0 nM and (3.83 nM–5.31 nM) respectively. The overall inhibition constant Ki⁎ value is 0.107 ± 0.015 nM. The progress curves are time-dependent and consistent with slow-tight binding inhibition: E + I ⇄ (k4, k5) EI ⇄ (k6, k7) EI⁎. Rate constant k6 = 2.73 ± 0.32 s− 1 reveals a fast isomerization of enzyme–inhibitor complex and very slow dissociation as proved by k7 = 0.068 ± 0.009 s− 1. The Rate constants from the intrinsic tryptophanyl fluorescence data is in agreement with those obtained from the kinetic analysis; therefore, the induced conformational changes were correlated to the isomerization of EI to EI⁎." @default.
• W2022115408 created "2016-06-24" @default.
• W2022115408 creator A5058116407 @default.
• W2022115408 creator A5086147659 @default.
• W2022115408 date "2006-12-01" @default.
• W2022115408 modified "2023-10-16" @default.
• W2022115408 title "Biochemical characterization of a low molecular weight aspartic protease inhibitor from thermo-tolerant Bacillus licheniformis: Kinetic interactions with Pepsin" @default.
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• W2022115408 doi "https://doi.org/10.1016/j.bbagen.2006.08.004" @default.
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