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Cytochrome P450, family 1, subfamily B, polypeptide 1
Available structures
PDB Ortholog search: PDBe, RCSB
Symbols CYP1B1 ; CP1B; CYPIB1; GLC3A; P4501B1
External IDs OMIM601771 MGI88590 HomoloGene68035 ChEMBL: 4878 GeneCards: CYP1B1 Gene
EC number
RNA expression pattern
PBB GE CYP1B1 202437 s at tn.png
PBB GE CYP1B1 202434 s at tn.png
PBB GE CYP1B1 202435 s at tn.png
More reference expression data
Species Human Mouse
Entrez 1545 13078
Ensembl ENSG00000138061 ENSMUSG00000024087
UniProt Q16678 Q64429
RefSeq (mRNA) NM_000104 NM_009994
RefSeq (protein) NP_000095 NP_034124
Location (UCSC) Chr 2:
38.07 – 38.11 Mb
Chr 17:
79.71 – 79.72 Mb
PubMed search [1] [2]

Cytochrome P450 1B1 is an enzyme that in humans is encoded by the CYP1B1 gene.[1]


CYP1B1 belongs to the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. The enzyme encoded by this gene localizes to the endoplasmic reticulum (ER) and metabolizes procarcinogens such as polycyclic aromatic hydrocarbons and 17beta-estradiol.

Despite over 20 years of research of CYP1A1 and CYP1A2, CYP1B1 was not identified and sequenced until 1994. Nucleic and amino acid analysis showed approximately 40% identity with CYP1A1. Despite this similarity, these two enzymes have very different catalytic efficiencies and metabolites when incubated with common substrates, such as retinoic acid and arachidonic acid. Recently CYP1B1 has been shown to be physiologically important in fetal development, since mutations in CYP1B1 are linked with a form of primary congenital glaucoma.

CYP1A1 and CYP1B1 are regulated by the Aryl hydrocarbon receptor, a ligand activated transcription factor. They are part of the Phase I reactions in drug metabolism.

Clinical significance[edit]

Mutations in this gene have been associated with primary congenital glaucoma; therefore it is thought that the enzyme also metabolizes a signaling molecule involved in eye development, possibly a steroid.[1]


Further reading[edit]

External links[edit]

This article incorporates text from the United States National Library of Medicine, which is in the public domain.