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0  structures 258  species 0  interactions 451  sequences 12  architectures

Family: NAAA-beta (PF15508)

Summary: beta subunit of N-acylethanolamine-hydrolyzing acid amidase

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This is the Wikipedia entry entitled "ASAH1". More...

ASAH1 Edit Wikipedia article

N-acylsphingosine amidohydrolase (acid ceramidase) 1
Symbols ASAH1 ; AC; ACDase; ASAH; PHP; PHP32; SMAPME
External IDs OMIM613468 MGI1277124 HomoloGene10504 ChEMBL: 5463 GeneCards: ASAH1 Gene
EC number
RNA expression pattern
PBB GE ASAH1 210980 s at tn.png
PBB GE ASAH1 213702 x at tn.png
More reference expression data
Species Human Mouse
Entrez 427 11886
Ensembl ENSG00000104763 ENSMUSG00000031591
UniProt Q13510 Q9WV54
RefSeq (mRNA) NM_001127505 NM_019734
RefSeq (protein) NP_001120977 NP_062708
Location (UCSC) Chr 8:
18.06 – 18.08 Mb
Chr 8:
41.34 – 41.37 Mb
PubMed search [1] [2]

Acid ceramidase is an enzyme that in humans is encoded by the ASAH1 gene.[1][2][3]

This gene encodes a heterodimeric protein consisting of a nonglycosylated alpha subunit and a glycosylated beta subunit that is cleaved to the mature enzyme posttranslationally. The encoded protein catalyzes the synthesis and degradation of ceramide into sphingosine and fatty acid. Mutations in this gene have been associated with a lysosomal storage disorder known as Farber disease and, recently, with a rare neurodegenerative condition known as spinal muscular atrophy with progressive myoclonic epilepsy.[4] Two transcript variants encoding distinct isoforms have been identified for this gene.[3] In melanocytic cells ASAH1 gene expression may be regulated by MITF.[5]


  1. ^ Koch J, Gartner S, Li CM, Quintern LE, Bernardo K, Levran O, Schnabel D, Desnick RJ, Schuchman EH, Sandhoff K (Jan 1997). "Molecular cloning and characterization of a full-length complementary DNA encoding human acid ceramidase. Identification Of the first molecular lesion causing Farber disease". J Biol Chem 271 (51): 33110–5. doi:10.1074/jbc.271.51.33110. PMID 8955159. 
  2. ^ Li CM, Park JH, He X, Levy B, Chen F, Arai K, Adler DA, Disteche CM, Koch J, Sandhoff K, Schuchman EH (Feb 2000). "The human acid ceramidase gene (ASAH): structure, chromosomal location, mutation analysis, and expression". Genomics 62 (2): 223–31. doi:10.1006/geno.1999.5940. PMID 10610716. 
  3. ^ a b "Entrez Gene: ASAH1 N-acylsphingosine amidohydrolase (acid ceramidase) 1". 
  4. ^ Zhou, J.; Tawk, M.; Tiziano, F. D.; Veillet, J.; Bayes, M.; Nolent, F.; Garcia, V.; Servidei, S.; Bertini, E.; Castro-Giner, F.; Renda, Y.; Carpentier, S. P.; Andrieu-Abadie, N.; Gut, I.; Levade, T.; Topaloglu, H.; Melki, J. (2012). "Spinal Muscular Atrophy Associated with Progressive Myoclonic Epilepsy is Caused by Mutations in ASAH1". The American Journal of Human Genetics 91 (1): 5–14. doi:10.1016/j.ajhg.2012.05.001. PMC 3397266. PMID 22703880.  edit
  5. ^ Hoek KS, Schlegel NC, Eichhoff OM; et al. (2008). "Novel MITF targets identified using a two-step DNA microarray strategy". Pigment Cell Melanoma Res. 21 (6): 665–76. doi:10.1111/j.1755-148X.2008.00505.x. PMID 19067971. 

Further reading

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

beta subunit of N-acylethanolamine-hydrolyzing acid amidase Provide feedback

NAAA-beta is a family of vertebral sequences that form the beta subunit of vertebral N-acylethanolamine-hydrolyzing acid amidase, a member of the choloylglycine hydrolase acid ceramidase family. The alpha subunit is represented by family CBAH, PF02275.

Literature references

  1. Li CM, Park JH, He X, Levy B, Chen F, Arai K, Adler DA, Disteche CM, Koch J, Sandhoff K, Schuchman EH;, Genomics. 1999;62:223-231.: The human acid ceramidase gene (ASAH): structure, chromosomal location, mutation analysis, and expression. PUBMED:10610716 EPMC:10610716

  2. Tsuboi K, Sun YX, Okamoto Y, Araki N, Tonai T, Ueda N;, J Biol Chem. 2005;280:11082-11092.: Molecular characterization of N-acylethanolamine-hydrolyzing acid amidase, a novel member of the choloylglycine hydrolase family with structural and functional similarity to acid ceramidase. PUBMED:15655246 EPMC:15655246

  3. West JM, Zvonok N, Whitten KM, Vadivel SK, Bowman AL, Makriyannis A;, PLoS One. 2012;7:e43877.: Biochemical and mass spectrometric characterization of human N-acylethanolamine-hydrolyzing Acid amidase inhibition. PUBMED:22952796 EPMC:22952796

  4. Lodola A, Branduardi D, De Vivo M, Capoferri L, Mor M, Piomelli D, Cavalli A;, PLoS One. 2012;7:e32397.: A catalytic mechanism for cysteine N-terminal nucleophile hydrolases, as revealed by free energy simulations. PUBMED:22389698 EPMC:22389698

External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR029130

This entry represents the N-terminal domain of acid ceramidase (AC), which degrades ceramide into sphingosine and fatty acid [PUBMED:10610716], and N-acylethanolamine-hydrolysing acid amidase (NAAA). NAAA is an N-acylethanolamine-hydrolysing enzyme that shows structural and functional similarity to acid ceramidase [PUBMED:15655246]. AC and NAAA can be cleaved into two chains: alpha and beta [PUBMED:18281275, PUBMED:17980170]. This entry represent the beta subunit (chain).

Domain organisation

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Seed source: Jackhmmer:Q13510
Previous IDs: none
Type: Family
Author: De Vivo M, Coggill P
Number in seed: 74
Number in full: 451
Average length of the domain: 89.90 aa
Average identity of full alignment: 27 %
Average coverage of the sequence by the domain: 23.52 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 80369284 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 27.0 27.0
Trusted cut-off 27.0 27.2
Noise cut-off 26.9 26.7
Model length: 95
Family (HMM) version: 2
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