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Reduces all-trans-retinal and 9-cis retinal. Can also catalyze the oxidation of all-trans-retinol with NADP as co-factor, but with much lower efficiency. Reduces alkyl phenyl ketones and alpha-dicarbonyl compounds with aromatic rings, such as pyrimidine-4-aldehyde, 3-benzoylpyridine, 4-benzoylpyridine, menadione and 4-hexanoylpyridine. Has no activity towards aliphatic aldehydes and ketones.
Gene References into Functions
An analysis of the relationship between the promoter characteristics and RNA expression of the DHRS4 gene cluster indicated that the development of CpG islands, in addition to the promoter sequence, during mammalian evolution could modulate the dose compensatory regulation of the copy number-varied DHRS4 gene cluster PMID: 27323117
AS1eRNA-driven DNA looping and activating histone modifications promote the expression of DHRS4-AS1 to economically control the DHRS4 gene cluster. PMID: 26864944
NRDRB1, an alternatively spliced isoform of NRDR in vivo functions better than NRDR as a dicarbonyl reductase for xenobiotics containing reactive carbonyls. PMID: 23128527
Results suggest a novel mechanism of cold inactivation and role of the inducible human DHRS4 in 3beta-hydroxysteroid synthesis and xenobiotic carbonyl metabolism PMID: 18571493
This study demonstrates that AS1DHRS4, as a long noncoding RNA, simultaneously controls the chromatin state of each gene within the DHRS4 gene cluster in a discriminative manner. PMID: 22891334
A rapid evolution rate brought the human DHRS2 gene, duplicated form of the DHRS4 one, to code a SDR enzyme having subcellular localization, synthesis regulation and specialized cellular functions very different from those of the human DHRS4 enzyme. PMID: 23036705
Analysis of exon composition in the transcripts of DHRS4 gene cluster revealed that exon 1 was absent in all the transcripts initiated from exon a1 of DHRS4L2 and exon a2 of DHRS4L1. PMID: 20525226
Alternatively spliced variant of NADP(H)-dependent retinol dehydrogenase/reductase with deletion of exon 3 is associated with cervical squamous carcinoma PMID: 17230527
Novel alternative splicing variants, transcribed from an alternative transcrioption start sites within the DHRS4 gene cluster were identified in this study. PMID: 18754758
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Subcellular Location
Peroxisome. Note=Isoform 1 is peroxisomal, while isoform 4 is not.; [Isoform 7]: Nucleus.
Protein Families
Short-chain dehydrogenases/reductases (SDR) family
Tissue Specificity
Isoform 1 is predominantly expressed in normal cervix (at protein level). Isoform 4 is expressed in some neoplastic cervical tissues, but not in normal cervix (at protein level). Isoform 5 and isoform 6 are expressed in a few neoplastic cervical tissues.