Human epididymis protein-4 (HE-4): a novel cross-class protease inhibitor.
Human epididymis protein-4 (HE-4): a novel cross-class protease inhibitor.
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DOI:
10.1371/journal.pone.0047672
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Yadav S
中科院分区:
文献类型:
--
作者:
Chhikara N;Saraswat M;Tomar AK;Dey S;Singh S;Yadav S
Epididymal proteins represent the factors necessary for maturation of sperm and play a crucial role in sperm maturation. HE-4, an epididymal protein, is a member of whey acidic protein four-disulfide core (WFDC) family with no known function. A WFDC protein has a conserved WFDC domain of 50 amino acids with eight conserved cystine residue. HE-4 is a 124 amino acid long polypeptide with two WFDC domains. Here, we show that HE-4 is secreted in the human seminal fluid as a disulfide-bonded homo-trimer and is a cross-class protease inhibitor inhibits some of the serine, aspartyl and cysteine proteases tested using hemoglobin as a substrate. Using SPR we have also observed that HE-4 shows a significant binding with all these proteases. Disulfide linkages are essential for this activity. Moreover, HE-4 is N-glycosylated and highly stable on a wide range of pH and temperature. Taken together this suggests that HE-4 is a cross-class protease inhibitor which might confer protection against microbial virulence factors of proteolytic nature.
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发表时间:
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