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|2mf9, 20 NMR models ()|
|Gene:||FKBP8, FKBP38 (Homo sapiens)|
Solution structure of the N-terminal domain of human FKBP38 (FKBP38NTD)
FKBP38 regulates apoptosis through unique interactions with multiple regulators including Bcl-2. Interestingly, the peptidylprolyl isomerase activity of FKBP38 is only detectable when it binds to calcium-saturated calmodulin (CaM/Ca(2+)). This, in turn, permits the formation of a complex with Bcl-2. FKBP38 thereby provides an important link between isomerase activity and apoptotic pathways. Here, we show that the N-terminal extension (residues 1-32) preceding the catalytic domain of FKBP38 has an autoinhibitory activity. The core isomerase activity of FKBP38 is inhibited by transient interactions involving the flexible N-terminal extension that precedes the catalytic domain. Notably, CaM/Ca(2+) binds to this N-terminal extension and thereby releases the autoinhibitory contacts between the N-terminal extension and the catalytic domain, thus potentiating the isomerase activity of FKBP38. Our data demonstrate how CaM/Ca(2+) modulates the catalytic activity of FKBP38.
Functional role of the flexible N-terminal extension of FKBP38 in catalysis., Kang C, Ye H, Chia J, Choi BH, Dhe-Paganon S, Simon B, Schutz U, Sattler M, Yoon HS, Sci Rep. 2013 Oct 22;3:2985. doi: 10.1038/srep02985. PMID:24145868
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
[FKBP8_HUMAN] Constitutively inactive PPiase, which becomes active when bound to calmodulin and calcium. Seems to act as a chaperone for BCL2, targets it to the mitochondria and modulates its phosphorylation state. The BCL2/FKBP8/calmodulin/calcium complex probably interferes with the binding of BCL2 to its targets. The active form of FKBP8 may therefore play a role in the regulation of apoptosis.  
About this Structure
- Kang C, Ye H, Chia J, Choi BH, Dhe-Paganon S, Simon B, Schutz U, Sattler M, Yoon HS. Functional role of the flexible N-terminal extension of FKBP38 in catalysis. Sci Rep. 2013 Oct 22;3:2985. doi: 10.1038/srep02985. PMID:24145868 doi:http://dx.doi.org/10.1038/srep02985
- ↑ Shirane M, Nakayama KI. Inherent calcineurin inhibitor FKBP38 targets Bcl-2 to mitochondria and inhibits apoptosis. Nat Cell Biol. 2003 Jan;5(1):28-37. PMID:12510191 doi:http://dx.doi.org/10.1038/ncb894
- ↑ Kang CB, Feng L, Chia J, Yoon HS. Molecular characterization of FK-506 binding protein 38 and its potential regulatory role on the anti-apoptotic protein Bcl-2. Biochem Biophys Res Commun. 2005 Nov 11;337(1):30-8. PMID:16176796 doi:http://dx.doi.org/S0006-291X(05)02012-7
- ↑ Weiwad M, Edlich F, Erdmann F, Jarczowski F, Kilka S, Dorn M, Pechstein A, Fischer G. A reassessment of the inhibitory capacity of human FKBP38 on calcineurin. FEBS Lett. 2005 Mar 14;579(7):1591-6. PMID:15757646 doi:http://dx.doi.org/S0014-5793(05)00180-8