Abstract
Homocysteine thiolactone (HCTL) is a cyclic thioester of homocysteine, showing high reactivity toward lysine residues of proteins. In the present study the structural properties and aggregation propensity of bovine pancreatic insulin were studied in the presences of increasing concentration of HCTL (0–500 μM), using different spectroscopic techniques. As shown in this study, HCTL induces gross structural alterations and subsequently aggregation of insulin in a dose dependent manner. Also induction of insulin aggregation by HCTL occurs in a sequential process, where native protein with alpha-helical abundant structure gradually transforms into partially folded conformations with the significant amount of beta-sheet. Since C-terminal B-chain of insulin plays a critical role in stability of this protein, the structural alteration/aggregation induced by HCTL can be consequence of homocysteinylation of the only Lysine residue (Lys29) on its B-chain. This study may have important implications regarding the effect of HCTL on structure of insulin particularly in the pathological states linked to hyperhomocysteinemia.
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Abbreviations
- ANS:
-
1-anilino-8-naphthalene sulfonate
- BLH:
-
Bleomycin hydrolase
- CBS:
-
Cystathionine β-synthase
- CD:
-
Circular dichroism
- CDNN:
-
Context dependent neural networks
- DLS:
-
Dynamic light scattering
- HCTL:
-
Homocysteine thiolactone
- Hcy:
-
Homocysteine
- Lys:
-
Lysine
- MetRS:
-
Methionyl-tRNA synthetase
- MS:
-
Met synthase
- MTHFR:
-
Methylene tetrahydrofolate reductase
- PON1:
-
Paraoxonase 1
- RH :
-
Hydrodynamic radius
- UF:
-
Ultra filtration
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Acknowledgments
We would like to thank the research council of Shiraz University for the financial support (Grant number: 88-GR-SCST-112). Also the support of Iran National Science Foundation (INSF)/Grant number: 88001578 is gratefully acknowledged.
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Jalili, S., Yousefi, R., Papari, MM. et al. Effect of Homocysteine Thiolactone on Structure and Aggregation Propensity of Bovine Pancreatic Insulin. Protein J 30, 299–307 (2011). https://doi.org/10.1007/s10930-011-9333-1
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DOI: https://doi.org/10.1007/s10930-011-9333-1