TITLE

Purification and Characterization of Albumin from Frog Skin of Duttaphrynus melanostictus

AUTHOR(S)
Zhang, Ying-Xia; Chen, Cong-Wei; Wang, Manchuriga; Wei, Shuang-Shuang; Guan, Huai; Chi, Ting-Ting; Qi, Xing-Zhu; Hu, Wen-Ting
PUB. DATE
October 2011
SOURCE
Protein Journal;Oct2011, Vol. 30 Issue 7, p464
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Following determination of trypsin inhibitory activity, a serine protease inhibitor was purified and characterized from frog Duttaphrynus melanostictus serum. It was identified as serum albumin, with molecular weight of 67 kDa ( DmA-serum). Different from bovine serum albumin, DmA-serum potently inhibited trypsin with similar K values around 1.6 × 10 M. No inhibitory effect on thrombin, chymotrypsin, elastase and subtilisin was observed under the assay conditions. The N-terminal amino acid is EAEPHSRI. Subsequently, a protein with same N-terminal amino acid was purified from skin, termed as DmA-skin. However, DmA-skin is distinct from DmA-serum by binding of a haem b (0.5 mol/mol protein), and with low trypsin inhibitory activity. Frog albumin is distributed in frog skin and exhibited trypsin inhibitory activity, suggesting that it plays important roles in skin physiological functions, like water economy, metabolite exchange and osmoregulation, etc.
ACCESSION #
66304324

 

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