Abstract
The use of lipase in hydrophilic solvent is usually hampered by inactivation. The solvent stability of a recombinant solvent stable lipase isolated from thermostable Bacillus sp. strain 42 (Lip 42), in DMSO and methanol were studied at different solvent-water compositions. The enzymatic activities were retained in up to 45% v/v solvent compositions. The near-UV CD spectra indicated that tertiary structures were perturbed at 60% v/v and above. Far-UV CD in methanol indicated the secondary structure in Lip 42 was retained throughout all solvent compositions. Fluorescence studies indicated formations of molten globules in solvent compositions of 60% v/v and above. The enzyme was able to retain its secondary structures in the presence of methanol; however, there was a general reduction in β-sheet and an increase in α-helix contents. The H-bonding arrangements triggered in methanol and DMSO, respectively, caused different forms of tertiary structure perturbations on Lip 42, despite both showing partial denaturation with molten globule formations.
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Abbreviations
- ANS:
-
8-Anilino-1-napthalene sulphonic acid
- DMSO:
-
Dimethyl sulfoxide
- UV CD:
-
Ultra violet circular dichroism
- MG:
-
Molten globule
- Phe:
-
Residue phenylalanine
- Trp:
-
Residue tryptophan
- Tyr:
-
Residue tyrosine
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Acknowledgments
This project was funded by the Ministry of Higher Education Malaysia (MOHE) under The Fundamental Research Grant Scheme (FRGS) (project number 01-01-07-009FR) and Tengku Haziyamin Tengku Abdul Hamid was supported by International Islamic University Malaysia for personal allowances.
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Hamid, T.H.T.A., Rahman, R.N.Z.R.A., Salleh, A.B. et al. Molten Globule-Triggered Inactivation of a Thermostable and Solvent Stable Lipase in Hydrophilic Solvents. Protein J 29, 290–297 (2010). https://doi.org/10.1007/s10930-010-9251-7
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DOI: https://doi.org/10.1007/s10930-010-9251-7