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2015 ; 5
(ä): 15192
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Mass Spectrometric and Spectrofluorometric Studies of the Interaction of
Aristolochic Acids with Proteins
#MMPMID26471474
Li W
; Hu Q
; Chan W
Sci Rep
2015[Oct]; 5
(ä): 15192
PMID26471474
show ga
Aristolochic acid (AA) is a potent carcinogen and nephrotoxin and is associated
with the development of "Chinese herb nephropathy" and Balkan endemic
nephropathy. Despite decades of research, the specific mechanism of the observed
nephrotoxicity has remained elusive and the potential effects on proteins due to
the observed toxicity of AA are not well-understood. To better understand the
pharmacotoxicological features of AA, we investigated the non-covalent
interactions of AA with proteins. The protein-binding properties of AA with
bovine serum albumin (BSA) and lysozyme were characterized using
spectrofluorometric and mass spectrometric (MS) techniques. Moreover, the
protein-AA complexes were clearly identified by high-resolution MS analyses. To
the best of our knowledge, this is the first direct evidence of non-covalently
bound protein-AA complexes. An analysis of the spectrofluorometric data by a
modified Stern-Volmer plot model also revealed that both aristolochic acid I
(AAI) and aristolochic acid II (AAII) were bound to BSA and lysozyme in 1:1
stoichiometries. A significantly stronger protein binding property was observed
in AAII than in AAI as evidenced by the spectrofluorometric and MS analyses,
which may explain the observed higher mutagenicity of AAII.