General function:

Involved in pyridoxal phosphate binding

Specific function:

Catalyzes the last step in the trans-sulfuration pathway from methionine to cysteine. Has broad substrate specificity. Converts cystathionine to cysteine, ammonia and 2-oxobutanoate. Converts two cysteine molecules to lanthionine and hydrogen sulfide. Can also accept homocysteine as substrate. Specificity depends on the levels of the endogenous substrates. Generates the endogenous signaling molecule hydrogen sulfide (H2S), and so contributes to the regulation of blood pressure. Acts as a cysteine-protein sulfhydrase by mediating sulfhydration of target proteins: sulfhydration consists of converting -SH groups into -SSH on specific cysteine residues of target proteins such as GAPDH, PTPN1 and NF-kappa-B subunit RELA, thereby regulating their function.

Gene Name:

CTH

Uniprot ID:

P32929

Molecular weight:

41259.91

Reactions

General function:

Involved in cysteine biosynthetic process from serine

Specific function:

Only known pyridoxal phosphate-dependent enzyme that contains heme. Important regulator of hydrogen sulfide, especially in the brain, utilizing cysteine instead of serine to catalyze the formation of hydrogen sulfide. Hydrogen sulfide is a gastratransmitter with signaling and cytoprotective effects such as acting as a neuromodulator in the brain to protect neurons against hypoxic injury (By similarity).

Gene Name:

CBS

Uniprot ID:

P35520

Molecular weight:

60586.05

Reactions

General function:

Involved in monooxygenase activity

Specific function:

Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It performs a variety of oxidation reactions (e.g. caffeine 8-oxidation, omeprazole sulphoxidation, midazolam 1'-hydroxylation and midazolam 4-hydroxylation) of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Acts as a 1,8-cineole 2-exo-monooxygenase. The enzyme also hydroxylates etoposide.

Gene Name:

CYP3A4

Uniprot ID:

P08684

Molecular weight:

57255.585

General function:

Involved in monooxygenase activity

Specific function:

Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. This enzyme contributes to the wide pharmacokinetics variability of the metabolism of drugs such as S-warfarin, diclofenac, phenytoin, tolbutamide and losartan.

Gene Name:

CYP2C9

Uniprot ID:

P11712

Molecular weight:

55627.365

General function:

Involved in monooxygenase activity

Specific function:

Responsible for the metabolism of a number of therapeutic agents such as the anticonvulsant drug S-mephenytoin, omeprazole, proguanil, certain barbiturates, diazepam, propranolol, citalopram and imipramine.

Gene Name:

CYP2C19

Uniprot ID:

P33261

Molecular weight:

55944.565

General function:

Involved in monooxygenase activity

Specific function:

Metabolizes several precarcinogens, drugs, and solvents to reactive metabolites. Inactivates a number of drugs and xenobiotics and also bioactivates many xenobiotic substrates to their hepatotoxic or carcinogenic forms.

Gene Name:

CYP2E1

Uniprot ID:

P05181

Molecular weight:

56848.42

General function:

Involved in monooxygenase activity

Specific function:

Exhibits low testosterone 6-beta-hydroxylase activity.

Gene Name:

CYP3A43

Uniprot ID:

Q9HB55

Molecular weight:

57756.285

General function:

Involved in monooxygenase activity

Specific function:

Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. Participates in the metabolism of an as-yet-unknown biologically active molecule that is a participant in eye development.

Gene Name:

CYP1B1

Uniprot ID:

Q16678

Molecular weight:

60845.33

General function:

Involved in monooxygenase activity

Specific function:

Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics.

Gene Name:

CYP2C18

Uniprot ID:

P33260

Molecular weight:

55710.075

General function:

Secondary metabolites biosynthesis, transport and catabolism

Specific function:

May be involved in the metabolism of various pneumotoxicants including naphthalene. Is able to dealkylate ethoxycoumarin, propoxycoumarin, and pentoxyresorufin but possesses no activity toward ethoxyresorufin and only trace dearylation activity toward benzyloxyresorufin. Bioactivates 3-methylindole (3MI) by dehydrogenation to the putative electrophile 3-methylene-indolenine.

Gene Name:

CYP2F1

Uniprot ID:

P24903

Molecular weight:

55500.64