WAP, kazal, immunoglobulin, kunitz and NTR domain-containing protein 1 is a protein that in humans is encoded by the WFIKKN1gene.
This gene encodes a secreted multidomain protein consisting of a signal peptide, a WAP domain, a follistatin domain, an immunoglobulin domain, two tandem Kunitz domains, and an NTR domain. These domains have been implicated frequently in inhibition of various types of proteases, suggesting that the encoded protein may be a multivalent protease inhibitor and may control the action of multiple types of serine proteases as well as metalloproteinases.
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Brandenberger R, Wei H, Zhang S, et al. (2005). "Transcriptome characterization elucidates signaling networks that control human ES cell growth and differentiation". Nat. Biotechnol.22 (6): 707–16. doi:10.1038/nbt971. PMID15146197.
Nagy A, Trexler M, Patthy L (2003). "Expression, purification and characterization of the second Kunitz-type protease inhibitor domain of the human WFIKKN protein". Eur. J. Biochem.270 (9): 2101–7. doi:10.1046/j.1432-1033.2003.03593.x. PMID12709070.
Daniels RJ, Peden JF, Lloyd C, et al. (2001). "Sequence, structure and pathology of the fully annotated terminal 2 Mb of the short arm of human chromosome 16". Hum. Mol. Genet.10 (4): 339–52. doi:10.1093/hmg/10.4.339. PMID11157797.