Skip to main content
Human Gene GNPDA1 (ENST00000508177.5) from GENCODE V49
  Description: Catalyzes the reversible conversion of alpha-D-glucosamine 6- phosphate (GlcN-6P) into beta-D-fructose 6-phosphate (Fru-6P) and ammonium ion, a regulatory reaction step in de novo uridine diphosphate-N-acetyl-alpha-D-glucosamine (UDP-GlcNAc) biosynthesis via hexosamine pathway. Deamination is coupled to aldo-keto isomerization mediating the metabolic flux from UDP-GlcNAc toward Fru-6P. At high ammonium level can drive amination and isomerization of Fru-6P toward hexosamines and UDP-GlcNAc synthesis (PubMed:21807125, PubMed:26887390). Has a role in fine tuning the metabolic fluctuations of cytosolic UDP-GlcNAc and their effects on hyaluronan synthesis that occur during tissue remodeling (PubMed:26887390). Seems to trigger calcium oscillations in mammalian eggs. These oscillations serve as the essential trigger for egg activation and early development of the embryo (By similarity). (from UniProt P46926)
Gencode Transcript: ENST00000508177.5
Gencode Gene: ENSG00000113552.17
Transcript (Including UTRs)
   Position: hg38 chr5:142,000,678-142,012,794 Size: 12,117 Total Exon Count: 6 Strand: -
Coding Region
   Position: hg38 chr5:142,002,029-142,012,035 Size: 10,007 Coding Exon Count: 6 

Page IndexSequence and LinksUniProtKB CommentsPrimersCTDRNA-Seq Expression
Microarray ExpressionRNA StructureProtein StructureOther SpeciesGO AnnotationsmRNA Descriptions
PathwaysOther NamesMethods
Data last updated at UCSC: 2025-09-17 13:57:07

-  Comments and Description Text from UniProtKB
  ID: GNPI1_HUMAN
DESCRIPTION: RecName: Full=Glucosamine-6-phosphate isomerase 1; EC=3.5.99.6; AltName: Full=Glucosamine-6-phosphate deaminase 1; Short=GNPDA 1; Short=GlcN6P deaminase 1; AltName: Full=Oscillin;
FUNCTION: Seems to trigger calcium oscillations in mammalian eggs. These oscillations serve as the essential trigger for egg activation and early development of the embryo (By similarity).
CATALYTIC ACTIVITY: D-glucosamine 6-phosphate + H(2)O = D-fructose 6-phosphate + NH(3).
SUBUNIT: Homohexamer.
SUBCELLULAR LOCATION: Cytoplasm (By similarity).
SIMILARITY: Belongs to the glucosamine/galactosamine-6-phosphate isomerase family.
SEQUENCE CAUTION: Sequence=BAA06544.2; Type=Erroneous initiation;

-  Primer design for this transcript
 

Primer3Plus can design qPCR Primers that straddle exon-exon-junctions, which amplify only cDNA, not genomic DNA.
Click here to load the transcript sequence and exon structure into Primer3Plus

Exonprimer can design one pair of Sanger sequencing primers around every exon, located in non-genic sequence.
Click here to open Exonprimer with this transcript

To design primers for a non-coding sequence, zoom to a region of interest and select from the drop-down menu: View > In External Tools > Primer3


-  Comparative Toxicogenomics Database (CTD)
  The following chemicals interact with this gene           more ... click here to view the complete list

-  RNA-Seq Expression Data from GTEx (53 Tissues, 570 Donors)
  Highest median expression: 20.02 RPKM in Adrenal Gland
Total median expression: 505.23 RPKM



View in GTEx track of Genome Browser    View at GTEx portal     View GTEx Body Map

+  Microarray Expression Data
 
Expression ratio colors:

GNF Expression Atlas 2 Data from U133A and GNF1H Chips

      
      
      
     
    
     
Ratios
      
      
      
     
    
     
Absolute
      
       
      
      
     
    
Ratios
      
       
      
      
     
    
Absolute
   
     
     
Ratios
   
     
     
Absolute

-  mRNA Secondary Structure of 3' and 5' UTRs
 
RegionFold EnergyBasesEnergy/Base
Display As
5' UTR -277.90759-0.366 Picture PostScript Text
3' UTR -426.701351-0.316 Picture PostScript Text

The RNAfold program from the Vienna RNA Package is used to perform the secondary structure predictions and folding calculations. The estimated folding energy is in kcal/mol. The more negative the energy, the more secondary structure the RNA is likely to have.

-  Protein Domain and Structure Information
  InterPro Domains: Graphical view of domain structure
IPR006148 - Glc/Gal-6P_isomerase
IPR004547 - Glucosamine6P_isomerase
IPR018321 - Glucosamine6P_isomerase_CS

Pfam Domains:
PF01182 - Glucosamine-6-phosphate isomerases/6-phosphogluconolactonase

Protein Data Bank (PDB) 3-D Structure
MuPIT help
1NE7 - X-ray MuPIT


ModBase Predicted Comparative 3D Structure on P46926
FrontTopSide
The pictures above may be empty if there is no ModBase structure for the protein. The ModBase structure frequently covers just a fragment of the protein. You may be asked to log onto ModBase the first time you click on the pictures. It is simplest after logging in to just click on the picture again to get to the specific info on that model.

-  Orthologous Genes in Other Species
  Orthologies between human, mouse, and rat are computed by taking the best BLASTP hit, and filtering out non-syntenic hits. For more distant species reciprocal-best BLASTP hits are used. Note that the absence of an ortholog in the table below may reflect incomplete annotations in the other species rather than a true absence of the orthologous gene.
MouseRatZebrafishD. melanogasterC. elegansS. cerevisiae
Genome BrowserGenome BrowserNo orthologNo orthologNo orthologNo ortholog
Gene Details     
Gene Sorter     
MGIRGD    
Protein SequenceProtein Sequence    
AlignmentAlignment    

-  Gene Ontology (GO) Annotations with Structured Vocabulary
  Molecular Function:
GO:0004342 glucosamine-6-phosphate deaminase activity
GO:0005515 protein binding
GO:0016787 hydrolase activity

Biological Process:
GO:0005975 carbohydrate metabolic process
GO:0006043 glucosamine catabolic process
GO:0006044 N-acetylglucosamine metabolic process
GO:0006091 generation of precursor metabolites and energy
GO:0007338 single fertilization

Cellular Component:
GO:0005737 cytoplasm
GO:0005829 cytosol
GO:0070062 extracellular exosome


-  Descriptions from all associated GenBank mRNAs
  LF211029 - JP 2014500723-A/18532: Polycomb-Associated Non-Coding RNAs.
MA446606 - JP 2018138019-A/18532: Polycomb-Associated Non-Coding RNAs.
BC001717 - Homo sapiens glucosamine-6-phosphate deaminase 1, mRNA (cDNA clone IMAGE:3503459).
BC022322 - Homo sapiens glucosamine-6-phosphate deaminase 1, mRNA (cDNA clone MGC:22666 IMAGE:4243999), complete cds.
AK022779 - Homo sapiens cDNA FLJ12717 fis, clone NT2RP1001253, highly similar to Glucosamine-6-phosphate isomerase (EC 3.5.99.6).
BC024664 - Homo sapiens glucosamine-6-phosphate deaminase 1, mRNA (cDNA clone IMAGE:4498209), with apparent retained intron.
AF029914 - Homo sapiens oscillin (hLn) mRNA, complete cds.
AJ002231 - Homo sapiens mRNA for glucosamine-6-phosphate.
D31766 - Homo sapiens KIAA0060 mRNA.
JD564133 - Sequence 545157 from Patent EP1572962.
JD152684 - Sequence 133708 from Patent EP1572962.
JD550446 - Sequence 531470 from Patent EP1572962.
JD085786 - Sequence 66810 from Patent EP1572962.
JD260275 - Sequence 241299 from Patent EP1572962.
LF343308 - JP 2014500723-A/150811: Polycomb-Associated Non-Coding RNAs.
MA578885 - JP 2018138019-A/150811: Polycomb-Associated Non-Coding RNAs.
JD302693 - Sequence 283717 from Patent EP1572962.
JD493281 - Sequence 474305 from Patent EP1572962.
JD148508 - Sequence 129532 from Patent EP1572962.
JD236318 - Sequence 217342 from Patent EP1572962.
JD476558 - Sequence 457582 from Patent EP1572962.
JD410043 - Sequence 391067 from Patent EP1572962.
JD371090 - Sequence 352114 from Patent EP1572962.
JD382503 - Sequence 363527 from Patent EP1572962.
JD340280 - Sequence 321304 from Patent EP1572962.
JD545077 - Sequence 526101 from Patent EP1572962.
JD037656 - Sequence 18680 from Patent EP1572962.
JD375396 - Sequence 356420 from Patent EP1572962.
JD304387 - Sequence 285411 from Patent EP1572962.
JD279653 - Sequence 260677 from Patent EP1572962.
AK296452 - Homo sapiens cDNA FLJ55085 complete cds, highly similar to Glucosamine-6-phosphate isomerase (EC 3.5.99.6).
AK290686 - Homo sapiens cDNA FLJ76269 complete cds, highly similar to Homo sapiens glucosamine-6-phosphate deaminase 1 (GNPDA1), mRNA.
JD162916 - Sequence 143940 from Patent EP1572962.
JD183045 - Sequence 164069 from Patent EP1572962.
BC012853 - Homo sapiens glucosamine-6-phosphate deaminase 1, mRNA (cDNA clone MGC:17146 IMAGE:3864091), complete cds.
BC020769 - Homo sapiens glucosamine-6-phosphate deaminase 1, mRNA (cDNA clone MGC:22665 IMAGE:4242886), complete cds.
LF343309 - JP 2014500723-A/150812: Polycomb-Associated Non-Coding RNAs.
MA578886 - JP 2018138019-A/150812: Polycomb-Associated Non-Coding RNAs.
JD466321 - Sequence 447345 from Patent EP1572962.
JD556870 - Sequence 537894 from Patent EP1572962.
AF048826 - Homo sapiens glucosamine-6-phosphate deaminase mRNA, complete cds.
CU676710 - Synthetic construct Homo sapiens gateway clone IMAGE:100021947 5' read GNPDA1 mRNA.
HQ447787 - Synthetic construct Homo sapiens clone IMAGE:100071128; CCSB012810_02 glucosamine-6-phosphate deaminase 1 (GNPDA1) gene, encodes complete protein.
KJ892893 - Synthetic construct Homo sapiens clone ccsbBroadEn_02287 GNPDA1 gene, encodes complete protein.
KJ898136 - Synthetic construct Homo sapiens clone ccsbBroadEn_07530 GNPDA1 gene, encodes complete protein.
AB384433 - Synthetic construct DNA, clone: pF1KA0060, Homo sapiens GNPDA1 gene for glucosamine-6-phosphate isomerase, complete cds, without stop codon, in Flexi system.
CU680414 - Synthetic construct Homo sapiens gateway clone IMAGE:100018747 5' read GNPDA1 mRNA.
LF343311 - JP 2014500723-A/150814: Polycomb-Associated Non-Coding RNAs.
MA578888 - JP 2018138019-A/150814: Polycomb-Associated Non-Coding RNAs.
JD023865 - Sequence 4889 from Patent EP1572962.
JD034695 - Sequence 15719 from Patent EP1572962.
JD429575 - Sequence 410599 from Patent EP1572962.
LF343314 - JP 2014500723-A/150817: Polycomb-Associated Non-Coding RNAs.
MA578891 - JP 2018138019-A/150817: Polycomb-Associated Non-Coding RNAs.
JD096674 - Sequence 77698 from Patent EP1572962.
LF343315 - JP 2014500723-A/150818: Polycomb-Associated Non-Coding RNAs.
MA578892 - JP 2018138019-A/150818: Polycomb-Associated Non-Coding RNAs.
JD285991 - Sequence 267015 from Patent EP1572962.

-  Biochemical and Signaling Pathways
  KEGG - Kyoto Encyclopedia of Genes and Genomes
hsa00520 - Amino sugar and nucleotide sugar metabolism
hsa01100 - Metabolic pathways

Reactome (by CSHL, EBI, and GO)

Protein P46926 (Reactome details) participates in the following event(s):

R-HSA-6799604 GNPDA1,2 hexamers deaminate GlcN6P to Fru(6)P
R-HSA-70171 Glycolysis
R-HSA-70326 Glucose metabolism
R-HSA-71387 Metabolism of carbohydrates
R-HSA-1430728 Metabolism

-  Other Names for This Gene
  Alternate Gene Symbols: AJ002231, B7Z3X4, D3DQE7, ENST00000508177.1, ENST00000508177.2, ENST00000508177.3, ENST00000508177.4, GNPDA1 , GNPI, GNPI1_HUMAN, HLN, KIAA0060, P46926, uc003lmf.1, uc003lmf.2, uc003lmf.3, uc003lmf.4, uc003lmf.5
UCSC ID: ENST00000508177.5
RefSeq Accession: XM_005268348.2
Protein: P46926 (aka GNPI1_HUMAN)
CCDS: CCDS4272.1

-  Methods, Credits, and Use Restrictions
  Click here for details on how this gene model was made and data restrictions if any.