1,4-alpha-glucan branching enzyme GlgB (glycogen branching enzyme); Essential enzyme that catalyzes the formation of the alpha- 1,6-glucosidic linkages in glucan chains by scission of a 1,4-alpha- linked oligosaccharide from growing alpha-1,4-glucan chains and the subsequent attachment of the oligosaccharide to the alpha-1,6 position. Is involved in the biosynthesis of both glycogen and capsular alpha-D- glucan.

Rv1564c, (MTCY48.01), len: 721 aa. Probable treX (previously called glgX), Maltooligosyltrehalose synthase. Strong similarity to D83245|g1890053 treX, glycogen debranching enzyme (glgX) from Sulfolobus acidocaldarius (713 aa), FASTA score: opt: 2396, E(): 0, (48.4% identity in 709 aa overlap); similar to GLGX_HAEIN|P45178 glycogen operon protein glgx (659 aa), FASTA scores: opt: 1512, E(): 0, (42.3% identity in 645 aa overlap); Belongs to the glycosyl hydrolase 13 family.

Putative glycosyl transferase GlgA; Involved in the biosynthesis of the maltose-1-phosphate (M1P) building block required for alpha-glucan production by the key enzyme GlgE. Catalyzes the formation of an alpha-1,4 linkage between glucose from ADP-glucose and glucose 1- phosphate (G1P) to yield maltose-1-phosphate (M1P). Also able to catalyze the elongation of the non-reducing ends of glycogen, maltodextrin and maltoheptaose using ADP-glucose as sugar donor, however the rate of the reaction appears to be too low to be physiologically relevant. GlgM is also able to use UDP-glucose as sug [...]

Probable glucanase GlgE; Essential maltosyltransferase that uses maltose 1-phosphate (M1P) as the sugar donor to elongate linear or branched alpha-(1->4)- glucans. Maltooligosaccharides with a degree of polymerization (DP) superior or equal to 4 are efficient acceptors, with DP5 being optimal in the GlgE-catalyzed polymerization with M1P. Is specific for the alpha-anomer of M1P as substrate, since the beta-anomer of M1P gives no activity. Exhibits an alpha-retaining catalytic mechanism. Is also able to catalyze the reverse reaction in vitro, releasing M1P from glycogen in the presence [...]

Rv3068c, (MTCY22D7.13), len: 547 aa. Probable pgmA,phosphoglucomutase, highly similar to other phosphoglucomutases e.g. Q9L117|PGM from Streptomyces coelicolor (546 aa), FASTA scores: opt: 2569, E(): 2.8e-149, (71.4% identity in 545 aa overlap); Q9ABY5|CC0085 from Caulobacter crescentus (545 aa), FASTA scores: opt: 2465, E(): 6.2e-143, (70.4% identity in 541 aa overlap); P38569|PGMU_ACEXY|CELB from Acetobacter xylinum (555 aa),FASTA scores: opt: 2206, E(): 4e-127, (62.25% identity in 543 aa overlap); P74643|PGM|SLL0726 from Synechocystis sp. strain PCC 6803 (567 aa), FASTA scores: opt: [...]

Probable 4-alpha-glucanotransferase MalQ (amylomaltase) (disproportionating enzyme) (D-enzyme); Rv1781c, (MTV049.03c), len: 724 aa. Probable malQ,4-alpha-glucanotransferase, similar to many, e.g. P15977|MALQ_ECOLI 4-alpha-glucanotransferase (694 aa),FASTA scores: opt: 964, E(): 0, (31.8% identity in 694 aa overlap). Belongs to the disproportionating enzyme family.

Trehalose synthase TreS; Catalyzes the reversible interconversion of maltose and trehalose by transglucosylation. Also displays amylase activity, catalyzing the endohydrolysis of (1->4)-alpha-D- glucosidic linkages in glycogen and maltooligosaccharides such as maltoheptaose, to produce maltose which then can be converted to trehalose. TreS plays a key role in the utilization of trehalose for the production of glycogen and alpha-glucan via the TreS-Pep2 branch involved in the biosynthesis of maltose-1-phosphate (M1P). Might also function as a sensor and/or regulator of trehalose levels [...]

Conserved protein; Catalyzes the formation of branch points in alpha-glucans by cleavage of an alpha-1,4 glycosidic bond and subsequent transfer of the cleaved-off oligosaccharide to a new alpha-1,6 position (Probable). Is probably involved in the biosynthesis of 6-O-methylglucosyl lipopolysaccharides (MGLP); Belongs to the glycosyl hydrolase 57 family.

Rv0993, (MTCI237.07), len: 306 aa. GalU,UTP--glucose-1-phosphate uridylyltransferase, equivalent to AL035500|MLCL373_22 putative UTP-glucose-1-phosphate uridylyltransferase from Mycobacterium leprae (306 aa),FASTA score: (89.7% identity in 302 aa overlap). Also highly similar to others e.g. AB59678.1|AL132674 UTP-glucose-1-phosphate uridylyltransferase from Streptomyces coelicolor (303 aa); NP_244519.1|NC_002570 UTP-glucose-1-phosphate uridylyltransferase from Bacillus halodurans (297 aa); P25520|GALU_ECOLI|B1236|Z2012|ECS17 UTP--glucose-1-phosphate uridylyltransferase from Escherichia [...]