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FIGURE: 1 / 3
Sequence of this protein is as follows: DLEAHIDSAN KNRDEAIKQL RKLQAQMKDC MRELDDTRAS REEILAQAKE NEKKLKSMEA EMIQLQEELA AAERAKRQAQ QERDELADEI ANSSGKGALA LEEKRRLEAR IAQLEEELEE EQGNTELIND RLKKANLQID QINTDLNLER SHAQKNENAR QQLERQNKEL KVKLQEMEGT VKSKYKASIT ALEAKIAQLE EQLDNETKER QAACKQVRRT EKKLKDVLLQ VDDERRNAEQ YKDQADKAST RLKQLKRQLE EAEEEAQRAN ASRRKLQREL EDATETADAM NREVSSLKNK LRRGDLPFVV PRRMARKGAG DGSDEEVDGK ADGAEAKPAE
TMP21 is a ubiquitously expressed protein that is involved in vesicular targeting and protein transport. More recent experiments have shown that it is also a component in the presenilin complex and modulates the -gamma-secretase but not the epsilon-secretase cleavage activity of the amyloid precursor protein. The presenilin complex is composed of the proteins APH1, nicastrin, and PEN2 in addition to presenilin-1. Together, these proteins cleave the amyloid precursor protein at what is known as the -gamma- and epsilon-sites and can lead to the accumulation of the Abeta cleavage product that is associated with Alzheimer's disease. Co-immunoprecipitation experiments using antibodies against these proteins also yielded TMP21 indicating that TMP21 may play a role in the regulation of this complex. Suppression of TMP21 expression by siRNA in transfected cells caused increased -gamma-secretase activity but not epsilon-secretase activity, and increased Abeta production, demonstrating that TMP21 can modulate -gamma-secretase activity.
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Protein Aliases: Cellular myosin heavy chain, type A; MGC104539; Myosin heavy chain 9; Myosin heavy chain, non-muscle IIa; Myosin-9; myosin9; NMHC-II A; NMMHC II-a; NMMHC IIA; NMMHC-A; non-muscle myosin heavy chain 9; Non-muscle myosin heavy chain A; Non-muscle myosin heavy chain IIa; non-muscle myosin heavy polypeptide 9; nonmuscle myosin heavy chain II-A
Gene Aliases: BDPLT6; DFNA17; EPSTS; FTNS; MHA; MYH9; NMHC-II-A; NMMHC-IIA; NMMHCA
UniProt ID: (Human) P35579
Entrez Gene ID: (Human) 4627
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