First Pin1 Alzheimer research assay on the market

Pin1 (Peptidyl-prolyl cis-trans isomerase NIMA-interacting 1; Peptidyl-prolyl isomerase, PPIase) is an enzyme that isomerizes phospho/Threonine-Proline motifs. Upon binding (to various target proteins) it can function as a protein regulator as it plays a role in post phosphorylation control.

Deregulation of PIN1 can lead to various diseases. Up-regulation is discussed to be implicated in specific cancer types, and down-regulation may be implicated in the pathogenesis Azheimer’s disease (1).

Role of Pin1 in Alzheimer’s disease

Pin1 activity graph
Fig. 1: SensoLyte® Green Pin1 Activity example (uncatalyzed corresponds to the Pin1 developer only reaction).

Tauopathies (such as Alzheimer’s disease) are neurodegenerative diseases associated with the pathological aggregation of microtubule-associated protein Tau, indeed hyperphosphorylated Tau is found in neurofibrillary tangles in Alzheimer’s patients. Tau phosphorylation mainly occurs at Ser/Thr sites. Recently it has been shown that Pin1 is involved in the regulation of Tau hyperphosphorylation and thus is the etiology of tautopathies (2).

Pin1 inhibitor graph
Fig. 2: Tannic acid inhibition of Pin1 activity measured with SensoLyte® Green Pin1 Activity Assay Kit.

Anaspec, who already provide a very broad offer for Alzheimer research (e.g. a very wide range of amyloid peptides), decided to develop the first commercial assay which enables researchers to measure the activity of Pin1. The SensoLyte® Green Pin1 Assay Kit uses a fluorogenic substrate in the cis isoform. Pin1 changes this substrate into the trans conformation, which is then readily cleaved to generate fluorescent signal. Fluorescence is monitored at Ex/Em=490/520nm. Increase in fluorescence intensity is directly proportional to the Pin1 activity. This homogeneous assay can be either used to measure the enzymatic activity of Pin1 or to detect effects of Pin1 inhibitors (see Fig. 1 and 2).

Interested in this new Pin1 assay? Interested in testing inhibiors of Pin1? If you need more information or have any comments, let me know through the form below.

References

1. Galas M-C., et.al., J Biol Chem 281, 28 (2006): 19296-10394.
2. Kimura T. et.al., J Biol Chem 288, 11 (2013): 7968-7977.

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3 Responses

  1. Hi Ali, thank you for your reply. Please let me know if you have any luck finding out.

    best wishes

    Carol

  2. Hi Ali,

    I am Nabham and I am looking for PIN1 inhibitors for my proliferation expreiments. So far I have tested PiB, AG-17724 and Juglone and only Juglone shows some effect and others doesnt show any effect. But Juglone is not a specific inhibitor of PIN1. So I wanted to know if you could suggest something for it?

    1. Dear Nabham,

      Thank you for reading our blog and interacting with us.

      EGCG (known as Epigallocatechin gallate) has been described to inhibit PIN1 as described recently by Xi et al. (Interaction between Pin1 and its natural product inhibitor epigallocatechin-3-gallate by spectroscopy and molecular dynamics simulations – Spectrochim Acta A Mol Biomol Spectrosc. 2016 Dec 5;169:134-43. doi: 10.1016/j.saa.2016.06.036).

      EGCG is commercially available here: http://www.tebu-bio.com/Product/282T2988-25mg/_Epigallocatechin_Gallate.html

      My colleague Ali is contacting you directly to further help you find other possible PIN1 inhibitors.

      Regards,

      Philippe

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