Beta-secretase 2

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Beta-site APP-cleaving enzyme 2
Protein BACE2 PDB 2ewy.png
PDB rendering based on 2ewy.
Available structures
PDB Ortholog search: PDBe, RCSB
Symbols BACE2 ; AEPLC; ALP56; ASP1; ASP21; BAE2; CEAP1; DRAP
External IDs OMIM605668 MGI1860440 HomoloGene22696 IUPHAR: 2331 ChEMBL: 2525 GeneCards: BACE2 Gene
EC number
RNA expression pattern
PBB GE BACE2 217867 x at tn.png
More reference expression data
Species Human Mouse
Entrez 25825 56175
Ensembl ENSG00000182240 ENSMUSG00000040605
UniProt Q9Y5Z0 Q9JL18
RefSeq (mRNA) NM_012105 NM_019517
RefSeq (protein) NP_036237 NP_062390
Location (UCSC) Chr 21:
42.54 – 42.65 Mb
Chr 16:
97.36 – 97.44 Mb
PubMed search [1] [2]

Beta-secretase 2 is an enzyme that in humans is encoded by the BACE2 gene.[1][2][3]

BACE2 is a close homolog of BACE1, a protease known to be an important enzyme involved in the cellular pathways that some believe lead to Alzheimer's disease. The physiological function and role of BACE2 in Alzheimer's disease is unknown.


Cerebral deposition of amyloid beta peptide is an early and critical feature of Alzheimer's disease and a frequent complication of Down syndrome. Amyloid beta peptide is generated by proteolytic cleavage of amyloid precursor protein by 2 proteases, one of which is the protein encoded by this gene. This gene localizes to the 'Down critical region' of chromosome 21. The encoded protein, a member of the peptidase A1 protein family, is a type I integral membrane glycoprotein and aspartic protease. Three transcript variants encoding different isoforms have been described for this gene.[3] It has been reported that BACE2 is the main protease that mediates the release of the amyloidogenic ectodomain of Pmel17 in melanocytes. [4]


BACE2 has been shown to interact with GGA1[5] and GGA2.[5]


  1. ^ Solans A, Estivill X, de La Luna S (Sep 2000). "A new aspartyl protease on 21q22.3, BACE2, is highly similar to Alzheimer's amyloid precursor protein beta-secretase". Cytogenetics and Cell Genetics 89 (3-4): 177–84. doi:10.1159/000015608. PMID 10965118. 
  2. ^ Hattori M, Fujiyama A, Taylor TD, Watanabe H, Yada T, Park HS et al. (May 2000). "The DNA sequence of human chromosome 21". Nature 405 (6784): 311–9. doi:10.1038/35012518. PMID 10830953. 
  3. ^ a b "Entrez Gene: BACE2 beta-site APP-cleaving enzyme 2". 
  4. ^ BACE2 processes PMEL to form the melanosome amyloid matrix in pigment cells Pubmed
  5. ^ a b He X, Chang WP, Koelsch G, Tang J (Jul 2002). "Memapsin 2 (beta-secretase) cytosolic domain binds to the VHS domains of GGA1 and GGA2: implications on the endocytosis mechanism of memapsin 2". FEBS Letters 524 (1-3): 183–7. doi:10.1016/S0014-5793(02)03052-1. PMID 12135764. 

Further reading[edit]

  • Aplin AE, Gibb GM, Jacobsen JS, Gallo JM, Anderton BH (Aug 1996). "In vitro phosphorylation of the cytoplasmic domain of the amyloid precursor protein by glycogen synthase kinase-3beta". Journal of Neurochemistry 67 (2): 699–707. doi:10.1046/j.1471-4159.1996.67020699.x. PMID 8764598. 
  • Yan R, Bienkowski MJ, Shuck ME, Miao H, Tory MC, Pauley AM et al. (Dec 1999). "Membrane-anchored aspartyl protease with Alzheimer's disease beta-secretase activity". Nature 402 (6761): 533–7. doi:10.1038/990107. PMID 10591213. 
  • Sadik G, Kaji H, Takeda K, Yamagata F, Kameoka Y, Hashimoto K et al. (Nov 1999). "In vitro processing of amyloid precursor protein by cathepsin D". The International Journal of Biochemistry & Cell Biology 31 (11): 1327–37. doi:10.1016/S1357-2725(99)00053-9. PMID 10605825. 
  • Hussain I, Powell D, Howlett DR, Tew DG, Meek TD, Chapman C et al. (Dec 1999). "Identification of a novel aspartic protease (Asp 2) as beta-secretase". Molecular and Cellular Neurosciences 14 (6): 419–27. doi:10.1006/mcne.1999.0811. PMID 10656250. 
  • Lin X, Koelsch G, Wu S, Downs D, Dashti A, Tang J (Feb 2000). "Human aspartic protease memapsin 2 cleaves the beta-secretase site of beta-amyloid precursor protein". Proceedings of the National Academy of Sciences of the United States of America 97 (4): 1456–60. doi:10.1073/pnas.97.4.1456. PMC 26455. PMID 10677483. 
  • Acquati F, Accarino M, Nucci C, Fumagalli P, Jovine L, Ottolenghi S et al. (Feb 2000). "The gene encoding DRAP (BACE2), a glycosylated transmembrane protein of the aspartic protease family, maps to the down critical region". FEBS Letters 468 (1): 59–64. doi:10.1016/S0014-5793(00)01192-3. PMID 10683441. 
  • Bennett BD, Babu-Khan S, Loeloff R, Louis JC, Curran E, Citron M et al. (Jul 2000). "Expression analysis of BACE2 in brain and peripheral tissues". The Journal of Biological Chemistry 275 (27): 20647–51. doi:10.1074/jbc.M002688200. PMID 10749877. 
  • Xin H, Stephans JC, Duan X, Harrowe G, Kim E, Grieshammer U et al. (Jun 2000). "Identification of a novel aspartic-like protease differentially expressed in human breast cancer cell lines". Biochimica Et Biophysica Acta 1501 (2-3): 125–37. doi:10.1016/s0925-4439(00)00014-4. PMID 10838186. 
  • Farzan M, Schnitzler CE, Vasilieva N, Leung D, Choe H (Aug 2000). "BACE2, a beta -secretase homolog, cleaves at the beta site and within the amyloid-beta region of the amyloid-beta precursor protein". Proceedings of the National Academy of Sciences of the United States of America 97 (17): 9712–7. doi:10.1073/pnas.160115697. PMC 16930. PMID 10931940. 
  • Iijima K, Ando K, Takeda S, Satoh Y, Seki T, Itohara S et al. (Sep 2000). "Neuron-specific phosphorylation of Alzheimer's beta-amyloid precursor protein by cyclin-dependent kinase 5". Journal of Neurochemistry 75 (3): 1085–91. doi:10.1046/j.1471-4159.2000.0751085.x. PMID 10936190. 
  • Hussain I, Powell DJ, Howlett DR, Chapman GA, Gilmour L, Murdock PR et al. (Nov 2000). "ASP1 (BACE2) cleaves the amyloid precursor protein at the beta-secretase site". Molecular and Cellular Neurosciences 16 (5): 609–19. doi:10.1006/mcne.2000.0884. PMID 11083922. 
  • Hussain I, Christie G, Schneider K, Moore S, Dingwall C (Jun 2001). "Prodomain processing of Asp1 (BACE2) is autocatalytic". The Journal of Biological Chemistry 276 (26): 23322–8. doi:10.1074/jbc.M101069200. PMID 11316808. 
  • Yan R, Munzner JB, Shuck ME, Bienkowski MJ (Sep 2001). "BACE2 functions as an alternative alpha-secretase in cells". The Journal of Biological Chemistry 276 (36): 34019–27. doi:10.1074/jbc.M105583200. PMID 11423558. 
  • Grüninger-Leitch F, Schlatter D, Küng E, Nelböck P, Döbeli H (Feb 2002). "Substrate and inhibitor profile of BACE (beta-secretase) and comparison with other mammalian aspartic proteases". The Journal of Biological Chemistry 277 (7): 4687–93. doi:10.1074/jbc.M109266200. PMID 11741910. 
  • Turner RT, Loy JA, Nguyen C, Devasamudram T, Ghosh AK, Koelsch G et al. (Jul 2002). "Specificity of memapsin 1 and its implications on the design of memapsin 2 (beta-secretase) inhibitor selectivity". Biochemistry 41 (27): 8742–6. doi:10.1021/bi025926t. PMID 12093293. 
  • Kim YT, Downs D, Wu S, Dashti A, Pan Y, Zhai P et al. (Nov 2002). "Enzymic properties of recombinant BACE2". European Journal of Biochemistry / FEBS 269 (22): 5668–77. doi:10.1046/j.1432-1033.2002.03277.x. PMID 12423367. 
  • Kondoh K, Tsuji N, Kamagata C, Sasaki M, Kobayashi D, Yagihashi A et al. (Mar 2003). "A novel aspartic protease gene, ALP56, is up-regulated in human breast cancer independently from the cathepsin D gene". Breast Cancer Research and Treatment 78 (1): 37–44. doi:10.1023/A:1022149226430. PMID 12611455. 

External links[edit]