5a63

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== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/PEN2_HUMAN PEN2_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). Probably represents the last step of maturation of gamma-secretase, facilitating endoproteolysis of presenilin and conferring gamma-secretase activity.<ref>PMID:12522139</ref> <ref>PMID:12763021</ref> [[http://www.uniprot.org/uniprot/NICA_HUMAN NICA_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). It probably represents a stabilizing cofactor required for the assembly of the gamma-secretase complex. [[http://www.uniprot.org/uniprot/APH1A_HUMAN APH1A_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral proteins such as Notch receptors and APP (beta-amyloid precursor protein). It probably represents a stabilizing cofactor for the presenilin homodimer that promotes the formation of a stable complex.<ref>PMID:12297508</ref> <ref>PMID:12522139</ref> <ref>PMID:12763021</ref> [[http://www.uniprot.org/uniprot/PSN1_HUMAN PSN1_HUMAN]] Probable catalytic subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). Requires the other members of the gamma-secretase complex to have a protease activity. May play a role in intracellular signaling and gene expression or in linking chromatin to the nuclear membrane. Stimulates cell-cell adhesion though its association with the E-cadherin/catenin complex. Under conditions of apoptosis or calcium influx, cleaves E-cadherin promoting the disassembly of the E-cadherin/catenin complex and increasing the pool of cytoplasmic beta-catenin, thus negatively regulating Wnt signaling. May also play a role in hematopoiesis.<ref>PMID:10545183</ref> <ref>PMID:10593990</ref> <ref>PMID:10206644</ref> <ref>PMID:10899933</ref> <ref>PMID:10811883</ref> <ref>PMID:11226248</ref> <ref>PMID:15341515</ref> <ref>PMID:16305624</ref>
[[http://www.uniprot.org/uniprot/PEN2_HUMAN PEN2_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). Probably represents the last step of maturation of gamma-secretase, facilitating endoproteolysis of presenilin and conferring gamma-secretase activity.<ref>PMID:12522139</ref> <ref>PMID:12763021</ref> [[http://www.uniprot.org/uniprot/NICA_HUMAN NICA_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). It probably represents a stabilizing cofactor required for the assembly of the gamma-secretase complex. [[http://www.uniprot.org/uniprot/APH1A_HUMAN APH1A_HUMAN]] Essential subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral proteins such as Notch receptors and APP (beta-amyloid precursor protein). It probably represents a stabilizing cofactor for the presenilin homodimer that promotes the formation of a stable complex.<ref>PMID:12297508</ref> <ref>PMID:12522139</ref> <ref>PMID:12763021</ref> [[http://www.uniprot.org/uniprot/PSN1_HUMAN PSN1_HUMAN]] Probable catalytic subunit of the gamma-secretase complex, an endoprotease complex that catalyzes the intramembrane cleavage of integral membrane proteins such as Notch receptors and APP (beta-amyloid precursor protein). Requires the other members of the gamma-secretase complex to have a protease activity. May play a role in intracellular signaling and gene expression or in linking chromatin to the nuclear membrane. Stimulates cell-cell adhesion though its association with the E-cadherin/catenin complex. Under conditions of apoptosis or calcium influx, cleaves E-cadherin promoting the disassembly of the E-cadherin/catenin complex and increasing the pool of cytoplasmic beta-catenin, thus negatively regulating Wnt signaling. May also play a role in hematopoiesis.<ref>PMID:10545183</ref> <ref>PMID:10593990</ref> <ref>PMID:10206644</ref> <ref>PMID:10899933</ref> <ref>PMID:10811883</ref> <ref>PMID:11226248</ref> <ref>PMID:15341515</ref> <ref>PMID:16305624</ref>
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== Publication Abstract from PubMed ==
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Dysfunction of the intramembrane protease gamma-secretase is thought to cause Alzheimer's disease, with most mutations derived from Alzheimer's disease mapping to the catalytic subunit presenilin 1 (PS1). Here we report an atomic structure of human gamma-secretase at 3.4 A resolution, determined by single-particle cryo-electron microscopy. Mutations derived from Alzheimer's disease affect residues at two hotspots in PS1, each located at the centre of a distinct four transmembrane segment (TM) bundle. TM2 and, to a lesser extent, TM6 exhibit considerable flexibility, yielding a plastic active site and adaptable surrounding elements. The active site of PS1 is accessible from the convex side of the TM horseshoe, suggesting considerable conformational changes in nicastrin extracellular domain after substrate recruitment. Component protein APH-1 serves as a scaffold, anchoring the lone transmembrane helix from nicastrin and supporting the flexible conformation of PS1. Ordered phospholipids stabilize the complex inside the membrane. Our structure serves as a molecular basis for mechanistic understanding of gamma-secretase function.
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An atomic structure of human gamma-secretase.,Bai XC, Yan C, Yang G, Lu P, Ma D, Sun L, Zhou R, Scheres SH, Shi Y Nature. 2015 Aug 17. doi: 10.1038/nature14892. PMID:26280335<ref>PMID:26280335</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
== References ==
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Revision as of 07:27, 26 August 2015

Cryo-EM structure of the human gamma-secretase complex at 3.4 angstrom resolution.

5a63, resolution 3.40Å

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