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sqr

Gene
sqr
Protein
Sulfide-quinone reductase
Organism
Aquifex aeolicus (strain VF5)
Length
430 amino acids
Function
Catalyzes the oxidation of hydrogen sulfide, with the help of a quinone. Consecutive reaction cycles lead to the accumulation of a polysulfide product on the active site Cys residues; these products are released when they exceed a critical length, typically as cyclooctasulfur.
Similarity
Belongs to the SQRD family.
Mass
47.449 kDa
Sequence
MAKHVVVIGGGVGGIATAYNLRNLMPDLKITLISDRPYFGFTPAFPHLAMGWRKFEDISVPLAPLLPKFNIEFINEKAESIDPDANTVTTQSGKKIEYDYLVIATGPKLVFGAEGQEENSTSICTAEHALETQKKLQELYANPGPVVIGAIPGVSCFGPAYEFALMLHYELKKRGIRYKVPMTFITSEPYLGHFGVGGIGASKRLVEDLFAERNIDWIANVAVKAIEPDKVIYEDLNGNTHEVPAKFTMFMPSFQGPEVVASAGDKVANPANKMVIVNRCFQNPTYKNIFGVGVVTAIPPIEKTPIPTGVPKTGMMIEQMAMAVAHNIVNDIRNNPDKYAPRLSAICIADFGEDAGFFFADPVIPPRERVITKMGKWAHYFKTAFEKYFLWKVRNGNIAPSFEEKVLEIFLKVHPIELCKDCEGAPGSRC

Gene
sqr
Protein
Sulfide-quinone reductase
Organism
Acidianus ambivalens
Length
409 amino acids
Function
Catalyzes the oxidation of sulfides, such as hydrogen sulfide, with the help of a quinone. Has the highest activity with caldariella quinone and decylubiquinone, and lower activity with naphtoquinones. Consecutive reaction cycles lead to the accumulation of a polysulfide product on the active site Cys residues; these products are released when they exceed a critical length, typically as cyclooctasulfur.
Similarity
Belongs to the SQRD family.
Mass
45.152 kDa
Sequence
MTKVLVLGGRFGALTAAYTLKRLVGSKADVKVINKSRFSYFRPALPHVAIGVRDVDELKVDLSEALPEKGIQFQEGTVEKIDAKSSMVYYTKPDGSMAEEEYDYVIVGIGAHLATELVKGWDKYGYSVCEPEFATKLREKLESFQGGNIAIGSGPFYQGHNPKPKVPENFVPNADSACEGPVFEMSLMLHGYFKKKGMLDKVHVTVFSPGEYLSDLSPNSRKAVASIYNQLGIKLVHNFKIKEIREHEIVDEKGNTIPADITILLPPYTGNPALKNSTPDLVDDGGFIPTDLNMVSIKYDNVYAVGDANSMTVPKLGYLAVMTGRIAAQHLANRLGVPTKVDKYYPTIMCVADNPYEGYAVSVKDDTWYGGTVSIADPAAVNHLKKELFTKYYMWTKGDMALEKFLASW