Entry
Name
L-aspartate semialdehyde sulfurtransferase;
MA1821 (locus name);
MJ0100 (locus name)
Class
Transferases;
Transferring sulfur-containing groups;
Sulfurtransferases
BRITE hierarchy
Sysname
hydrogen sulfide:L-aspartate-4-semialdehyde sulfurtransferase
Reaction(IUBMB)
hydrogen sulfide + L-aspartate 4-semialdehyde + 2 reduced ferredoxin [iron-sulfur] cluster + 2 H+ = L-homocysteine + H2O + 2 oxidized ferredoxin [iron-sulfur] cluster [RN:
R12505 ]
Reaction(KEGG)
Substrate
hydrogen sulfide [CPD:
C00283 ];
L-aspartate 4-semialdehyde [CPD:
C00441 ];
reduced ferredoxin [iron-sulfur] cluster [CPD:
C00138 ];
H+ [CPD:
C00080 ]
Product
L-homocysteine [CPD:
C00155 ];
H2O [CPD:
C00001 ];
oxidized ferredoxin [iron-sulfur] cluster [CPD:
C00139 ]
Comment
The enzyme, characterized from the archaeon Methanosarcina acetivorans, participates in an L-methionine biosysnthetic pathway found in most of the methanogenic archaea.
History
EC 2.8.1.16 created 2019
Pathway
ec00270 Cysteine and methionine metabolism
Orthology
K23975 L-aspartate semialdehyde sulfurtransferase
Genes
SYY : SYNGTS_0403(slr0689)
SYT : SYNGTI_0403(slr0689)
SYS : SYNPCCN_0403(slr0689)
SYQ : SYNPCCP_0403(slr0689)
MIG : Metig_0741 Metig_1786
MEHF : MmiHf6_05210(impDH_1)
MEES : MmiEs2_04710(impDH_2)
» show all
Taxonomy
Reference
Authors
Rauch BJ, Gustafson A, Perona JJ
Title
Novel proteins for homocysteine biosynthesis in anaerobic microorganisms.
Journal
Sequence
Reference
Authors
Allen KD, Miller DV, Rauch BJ, Perona JJ, White RH
Title
Homocysteine is biosynthesized from aspartate semialdehyde and hydrogen sulfide in methanogenic archaea.
Journal
Sequence
Other DBs
ExplorEnz - The Enzyme Database: 2.8.1.16
ExPASy - ENZYME nomenclature database: 2.8.1.16