Multiple binding sites for anaesthetics in HSA (human serum albumin) make solution studies difficult to interpret. In the present study, we expressed the wild-type HSA domain 3 (wtHSAd3), a peptide with two known anaesthetic binding sites in a yeast expression system. We also expressed a site-directed mutant of domain 3 (Y411Wd3). The stability and secondary structure of the constructed fragments were determined by HX (hydrogen–tritium exchange) and CD spectroscopy. The binding of two general anaesthetics, 2-bromo-2-chloro-1,1,1-trifluoroethane and propofol, to wtHSAd3 and Y411Wd3 was determined using isothermal titration calorimetry, HX and intrinsic tryptophan fluorescence quenching. Although the expressed fragments are less stable than intact wtHSA as indicated by both CD and HX, they retain the secondary structure and anaesthetic-binding characteristics of an intact HSA molecule, but with fewer binding sites. Y411Wd3 had decreased affinity for propofol but not for 2-bromo-2-chloro-1,1,1-trifluoroethane, consistent with steric hindrance. Retention of structural features and anaesthetic binding properties with fewer binding sites in this truncated protein provide feasibility for using scaled-down models of otherwise intractable systems to gain an understanding of anaesthetic binding requirements and binding–stability relationships.
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May 2005
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Research Article|
May 10 2005
Truncated human serum albumin retains general anaesthetic binding activity
Renyu LIU;
Renyu LIU
*Department of Anesthesia, University of Pennsylvania Medical Center, 3400 Spruce Street, 7 Dulles, Philadelphia, PA 19104-4283, U.S.A.
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Jinsheng YANG;
Jinsheng YANG
†Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A.
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Chung-Eun HA;
Chung-Eun HA
†Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A.
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Nadhipuram V. BHAGAVAN;
Nadhipuram V. BHAGAVAN
†Department of Biochemistry and Biophysics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96822, U.S.A.
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Roderic G. ECKENHOFF
Roderic G. ECKENHOFF
1
*Department of Anesthesia, University of Pennsylvania Medical Center, 3400 Spruce Street, 7 Dulles, Philadelphia, PA 19104-4283, U.S.A.
1To whom correspondence should be addressed (email roderic.eckenhoff@uphs.upenn.edu).
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Biochem J (2005) 388 (1): 39–45.
Article history
Received:
July 20 2004
Revision Received:
November 19 2004
Accepted:
January 06 2005
Accepted Manuscript online:
January 06 2005
Citation
Renyu LIU, Jinsheng YANG, Chung-Eun HA, Nadhipuram V. BHAGAVAN, Roderic G. ECKENHOFF; Truncated human serum albumin retains general anaesthetic binding activity. Biochem J 15 May 2005; 388 (1): 39–45. doi: https://doi.org/10.1042/BJ20041224
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