Carbohydrate-active enzymes from the zygomycete fungus Rhizopus oryzae: a highly specialized approach to carbohydrate degradation depicted at genome level

Table 2 Number of putative enzyme models for plant cell-wall degradation in different fungal genomes, assigned by substrate category.

species	cellu-lose	xylo-glucan	β-1,3-1,4-glucan	xylan	galacto-mannan	starch	inulin	pectin
Rhizopus oryzae	22	3	19	8	13	13	0	27
Ustilago maydis	19	3	38	15	15	10	2	15
Postia placenta	53	12	83	14	45	21	0	35
Phanerochaete chrysosporium	59	13	56	28	25	17	0	25
Laccaria bicolor	33	9	60	3	25	15	0	15
Schizophyllum commune	60	9	59	49	24	20	1	68
Saccharomyces cerevisiae	5	1	14	1	5	11	1	2
Hypocrea jecorina	33	11	35	26	28	11	0	21
Nectria haematococca	78	19	54	82	33	20	6	134
Gibberella zeae	59	16	48	56	30	19	5	87
Podospora anserina	72	8	39	55	26	17	0	47
Chaetomium globosum	84	12	42	65	24	17	2	66
Magnaporthe grisea	67	15	46	68	27	18	4	62
Aspergillus fumigatus	49	14	40	52	27	27	5	87
Aspergillus oryzae	51	17	38	63	27	30	4	109
Aspergillus niger	44	14	33	42	24	25	4	83
Penicillium chrysogenum	40	15	39	39	23	30	7	56
Aspergillus nidulans	55	16	38	52	36	25	2	94

The number of enzymes in the different functional categories is only a rough estimate and not an absolute count, as functional assignments are sometimes based on remote sequence similarities to biochemically characterized enzymes. Total values obtained per substrate correspond to the theoretical maximum number of active enzymes that could be obtained by adding up all the members of the concerned families (as described in Suplementary Table 2). These values are to be taken as a maximum rather than as absolute values. For Postia placenta, absolute values from the genomic effort on a dikaryon are provided but a monokaryon is estimated to correspond to approximately to 70% of the total provided (Coutinho and Henrissat, unpublished).

ISSN: 1471-2164