Cystine transporter subunit; Part of the ABC transporter complex FliY-YecC-YecS involved in L-cystine transport. The system can probably also transport L- cysteine, and it mediates accumulation of the toxic compounds L- selenaproline (SCA) and L-selenocystine (SeCys). Binds cystine ; Belongs to the bacterial solute-binding protein 3 family.

Putative ABC transporter ATPase; Part of the ABC transporter complex FliY-YecC-YecS involved in L-cystine transport. The system can probably also transport L- cysteine, and it mediates accumulation of the toxic compounds L- selenaproline (SCA) and L-selenocystine (SeCys). Probably responsible for energy coupling to the transport system (Probable).

PLP-dependent beta-cystathionase and maltose regulon regulator; Acts as a beta-cystathionase and as a repressor of the maltose regulon.

Cystathionine beta-lyase, PLP-dependent; Primarily catalyzes the cleavage of cystathionine to homocysteine, pyruvate and ammonia during methionine biosynthesis. Also exhibits cysteine desulfhydrase activity, producing sulfide from cysteine. In addition, under certain growth conditions, exhibits significant alanine racemase coactivity.

3-mercaptopyruvate sulfurtransferase; Transfers a sulfur ion to cyanide or to other thiol compounds. Also has weak rhodanese activity (130-fold lower). Its participation in detoxification of cyanide may be small. May be involved in the enhancement of serine sensitivity.

Putative transporter; Involved in L-cystine transport. Can probably also transport L-cysteine. Mediates accumulation of the toxic compounds L- selenaproline (SCA) and L-selenocystine (SeCys). Belongs to the dicarboxylate/amino acid:cation symporter (DAACS) (TC 2.A.23) family.

N-methyltryptophan oxidase, FAD-binding; Catalyzes the oxidative demethylation of N-methyl-L- tryptophan. Can also use other N-methyl amino acids, including sarcosine, which, however, is a poor substrate.

RpoS antagonist; During the post-exponential growth phase transiently interferes with RpoS (sigma S) activity without affecting expression of RpoS itself. It is probably not an anti-sigma factor as its overexpression is detrimental in rapidly growing cells where there is almost no sigma S factor. There is a strong overlap between Crl- activated genes and FliZ-down-regulated genes. FliZ acts as a timing device for expression of the genes for the adhesive curli fimbriae by indirectly decreasing expression of the curli regulator CsgD.

2,3-diaminopropionate ammonia lyase, PLP-dependent; Catalyzes the alpha,beta-elimination reaction of both L- and D-alpha,beta-diaminopropionate (DAP) to form pyruvate and ammonia. In vitro the D-isomer of serine is degraded to pyruvate, though very poorly; other amino acids (L-serine, D- and L-threonine, D- and L-beta- Cl-alanine) are not substrates. In vivo allows poor growth on L-DAP or a DL-DAP mixture but not on D-DAP alone, this may be due to a poor promoter. DL-DAP is toxic in the absence of this enzyme, it may inhibit enzymes involved in the synthesis of pyruvate and aspartate, [...]