Table 1.

Comparison of the β-galactosidase amino acid sequences of Bacillus circulans ATCC 31382 with other β-galactosidases.

Enzyme source	Enzyme name	No. a.a.a	Identity (%)	Similarity (%)	Uniprot code	PDB codeb
Bacillus circulans ATCC 31382	BgaD-A	1737	100	100	E5RWQ2
Bifidobacterium bifidum DSM 20215	BIF3	1752	28	43	Q9F4D5
Bifidobacterium bifidum NCIMB 41171	BbgIII	1935	29	42	A4K5H9
Bifidobacterium bifidum NCIMB 41171	BbgI	1291	14	24	E4V7B8
Bifidobacterium bifidum NCIMB 41171	BbgIV	1052	13	23	Q0ZII7
Kluyveromyces lactis CBS2359	BgaL	1025	13	22	P00723	3OB8
Escherichia coli K12	LacZ	1024	13	22	P00722	1DP0
Arthrobacter sp. C2-2	LacZ	1023	13	25	Q8KRF6	1YQ2

^aNumber of amino acids.

^bPDB codes used for structural alignment with the 3D model of the rBgaD-cat (a.a. 50–650).