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HMDB Protein ID HMDBP02675
Secondary Accession Numbers
  • 8178
Name Epididymal secretory protein E1
  1. He1
  2. Human epididymis-specific protein 1
  3. Niemann-Pick disease type C2 protein
Gene Name NPC2
Protein Type Enzyme
Biological Properties
General Function Involved in cholesterol binding
Specific Function May be involved in the regulation of the lipid composition of sperm membranes during the maturation in the epididymis
Pathways Not Available
Reactions Not Available
GO Classification Not Available
Cellular Location
  1. Secreted (Potential)
Gene Properties
Chromosome Location Chromosome:1
Locus 14q24.3
Gene Sequence
>456 bp
Protein Properties
Number of Residues 151
Molecular Weight 16570.1
Theoretical pI 7.77
Pfam Domain Function
  • 1-19
Transmembrane Regions
  • None
Protein Sequence
>Epididymal secretory protein E1
GenBank ID Protein 12803417
UniProtKB/Swiss-Prot ID P61916
UniProtKB/Swiss-Prot Entry Name NPC2_HUMAN
PDB IDs Not Available
GenBank Gene ID BC002532
GeneCard ID NPC2
GenAtlas ID NPC2
General References
  1. Chen R, Jiang X, Sun D, Han G, Wang F, Ye M, Wang L, Zou H: Glycoproteomics analysis of human liver tissue by combination of multiple enzyme digestion and hydrazide chemistry. J Proteome Res. 2009 Feb;8(2):651-61. doi: 10.1021/pr8008012. [PubMed:19159218 ]
  2. Gerhard DS, Wagner L, Feingold EA, Shenmen CM, Grouse LH, Schuler G, Klein SL, Old S, Rasooly R, Good P, Guyer M, Peck AM, Derge JG, Lipman D, Collins FS, Jang W, Sherry S, Feolo M, Misquitta L, Lee E, Rotmistrovsky K, Greenhut SF, Schaefer CF, Buetow K, Bonner TI, Haussler D, Kent J, Kiekhaus M, Furey T, Brent M, Prange C, Schreiber K, Shapiro N, Bhat NK, Hopkins RF, Hsie F, Driscoll T, Soares MB, Casavant TL, Scheetz TE, Brown-stein MJ, Usdin TB, Toshiyuki S, Carninci P, Piao Y, Dudekula DB, Ko MS, Kawakami K, Suzuki Y, Sugano S, Gruber CE, Smith MR, Simmons B, Moore T, Waterman R, Johnson SL, Ruan Y, Wei CL, Mathavan S, Gunaratne PH, Wu J, Garcia AM, Hulyk SW, Fuh E, Yuan Y, Sneed A, Kowis C, Hodgson A, Muzny DM, McPherson J, Gibbs RA, Fahey J, Helton E, Ketteman M, Madan A, Rodrigues S, Sanchez A, Whiting M, Madari A, Young AC, Wetherby KD, Granite SJ, Kwong PN, Brinkley CP, Pearson RL, Bouffard GG, Blakesly RW, Green ED, Dickson MC, Rodriguez AC, Grimwood J, Schmutz J, Myers RM, Butterfield YS, Griffith M, Griffith OL, Krzywinski MI, Liao N, Morin R, Palmquist D, Petrescu AS, Skalska U, Smailus DE, Stott JM, Schnerch A, Schein JE, Jones SJ, Holt RA, Baross A, Marra MA, Clifton S, Makowski KA, Bosak S, Malek J: The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC). Genome Res. 2004 Oct;14(10B):2121-7. [PubMed:15489334 ]
  3. Leong WF, Chow VT: Transcriptomic and proteomic analyses of rhabdomyosarcoma cells reveal differential cellular gene expression in response to enterovirus 71 infection. Cell Microbiol. 2006 Apr;8(4):565-80. [PubMed:16548883 ]
  4. Krull N, Ivell R, Osterhoff C, Kirchhoff C: Region-specific variation of gene expression in the human epididymis as revealed by in situ hybridization with tissue-specific cDNAs. Mol Reprod Dev. 1993 Jan;34(1):16-24. [PubMed:8418812 ]
  5. Naureckiene S, Sleat DE, Lackland H, Fensom A, Vanier MT, Wattiaux R, Jadot M, Lobel P: Identification of HE1 as the second gene of Niemann-Pick C disease. Science. 2000 Dec 22;290(5500):2298-301. [PubMed:11125141 ]
  6. Millat G, Chikh K, Naureckiene S, Sleat DE, Fensom AH, Higaki K, Elleder M, Lobel P, Vanier MT: Niemann-Pick disease type C: spectrum of HE1 mutations and genotype/phenotype correlations in the NPC2 group. Am J Hum Genet. 2001 Nov;69(5):1013-21. Epub 2001 Sep 20. [PubMed:11567215 ]
  7. Klunemann HH, Elleder M, Kaminski WE, Snow K, Peyser JM, O'Brien JF, Munoz D, Schmitz G, Klein HE, Pendlebury WW: Frontal lobe atrophy due to a mutation in the cholesterol binding protein HE1/NPC2. Ann Neurol. 2002 Dec;52(6):743-9. [PubMed:12447927 ]
  8. Park WD, O'Brien JF, Lundquist PA, Kraft DL, Vockley CW, Karnes PS, Patterson MC, Snow K: Identification of 58 novel mutations in Niemann-Pick disease type C: correlation with biochemical phenotype and importance of PTC1-like domains in NPC1. Hum Mutat. 2003 Oct;22(4):313-25. [PubMed:12955717 ]
  9. Chikh K, Rodriguez C, Vey S, Vanier MT, Millat G: Niemann-Pick type C disease: subcellular location and functional characterization of NPC2 proteins with naturally occurring missense mutations. Hum Mutat. 2005 Jul;26(1):20-8. [PubMed:15937921 ]
  10. Millat G, Bailo N, Molinero S, Rodriguez C, Chikh K, Vanier MT: Niemann-Pick C disease: use of denaturing high performance liquid chromatography for the detection of NPC1 and NPC2 genetic variations and impact on management of patients and families. Mol Genet Metab. 2005 Sep-Oct;86(1-2):220-32. [PubMed:16126423 ]