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EC 3.13.1.9 Details

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EC number

3.13.1.9

Accepted name

S-inosyl-L-homocysteine hydrolase

Reaction

S-inosyl-L-homocysteine + H₂O = inosine + L-homocysteine

Other name(s)

SIHH

Systematic name

S-inosyl-L-homocysteine hydrolase (inosine-forming)

Comment

The enzyme, characterized from the methanogenic archaeon Methanocaldococcus jannaschii, binds an NAD⁺ cofactor. It participates in an alternative pathway for the regeneration of S-adenosyl-L-methionine from S-adenosyl-L-homocysteine that involves the deamination of the latter to S-inosyl-L-homocysteine.

History

created 2020

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.5.1 With NAD⁺ or NADP⁺ as acceptor

1.5.3 With oxygen as acceptor

1.5.4 With a disulfide as acceptor

1.5.5 With a quinone or similar compound as acceptor

1.5.7 With an iron-sulfur protein as acceptor

1.5.8 With a flavin or flavoprotein as acceptor

1.5.98 With other, known, physiological acceptors

1.5.99 With unknown physiological acceptors

1.6 Acting on NADH or NADPH

1.7 Acting on other nitrogenous compounds as donors

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.12 Acting on hydrogen as donor

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

3.1 Acting on ester bonds

3.1.1 Carboxylic-ester hydrolases

3.1.2 Thioester hydrolases

3.1.3 Phosphoric-monoester hydrolases

3.1.4 Phosphoric-diester hydrolases

3.1.5 Triphosphoric-monoester hydrolases

3.1.6 Sulfuric-ester hydrolases

3.1.7 Diphosphoric-monoester hydrolases

3.1.8 Phosphoric-triester hydrolases

3.1.11 Exodeoxyribonucleases producing 5′-phosphomonoesters

3.1.12 Exodeoxyribonucleases producing 3′-phosphomonoesters

3.1.13 Exoribonucleases producing 5′-phosphomonoesters

3.1.14 Exoribonucleases producing 3'-phosphomonoesters

3.1.15 Exonucleases that are active with either ribo- or deoxyribonucleic acids and produce 5'-phosphomonoesters

3.1.16 Exonucleases that are active with either ribo- or deoxyribonucleic acids and produce 3'-phosphomonoesters

3.1.21 Endodeoxyribonucleases producing 5'-phosphomonoesters

3.1.22 Endodeoxyribonucleases producing 3'-phosphomonoesters

3.1.23 Site-specific endodeoxyribonucleases: cleavage is sequence specific (deleted sub-subclass)

3.1.24 Site specific endodeoxyribonucleases: cleavage is not sequence specific (deleted sub-subclass)

3.1.25 Site-specific endodeoxyribonucleases that are specific for altered bases

3.1.26 Endoribonucleases producing 5'-phosphomonoesters

3.1.27 Endoribonucleases producing 3'-phosphomonoesters

3.1.30 Endoribonucleases that are active with either ribo- or deoxyribonucleic acids and produce 5'-phosphomonoesters

3.1.31 Endoribonucleases that are active with either ribo- or deoxyribonucleic acids and produce 3'-phosphomonoesters

3.2 Glycosylases

3.3 Acting on ether bonds

3.4 Acting on peptide bonds (peptidases)

3.5 Acting on carbon-nitrogen bonds, other than peptide bonds

3.6 Acting on acid anhydrides

3.7 Acting on carbon-carbon bonds

3.8 Acting on halide bonds

3.9 Acting on phosphorus-nitrogen bonds

3.10 Acting on sulfur-nitrogen bonds

3.10.1 Acting on sulfur-nitrogen bonds (only sub-subclass identified to date)

3.11 Acting on carbon-phosphorus bonds

3.12 Acting on sulfur-sulfur bonds

3.13 Acting on carbon-sulfur bonds

3.13.1 Acting on carbon-sulfur bonds

3.13.1.1 UDP-sulfoquinovose synthase

3.13.1.2 created 1972 as EC 3.3.1.3, transferred 2001 to EC 3.2.1.148, transferred 2004 to EC 3.13.1.2, deleted 2005

3.13.1.3 2′-hydroxybiphenyl-2-sulfinate desulfinase

3.13.1.4 3-sulfinopropanoyl-CoA desulfinase

3.13.1.5 carbon disulfide hydrolase

3.13.1.6 [CysO sulfur-carrier protein]-S-L-cysteine hydrolase

3.13.1.7 carbonyl sulfide hydrolase

3.13.1.8 S-adenosyl-L-methionine hydrolase (adenosine-forming)

3.13.1.9 S-inosyl-L-homocysteine hydrolase

3.13.2 Thioether and trialkylsulfonium hydrolases

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Release 2023.1 (January 2023)