Table 1.

Overview of determined and predicted functions of membrane proteins in B. subtilis. The numbers of membrane proteins belonging to each functional category are shown.

Cell envelope and cellular processes		522
	cell wall	40
	transport/binding proteins and lipoproteins	305
	signal transduction (sensors)	30
	membrane bioenergetics	35
	motility and chemotaxis	20
	protein secretion	15
	cell division	8
	sporulation	47
	germination	13
	transformation/competence	9
Intermediary metabolism		62
	Metabolism of carbohydrates	17
	Metabolism of amino acids	12
	Metabolism of nucleotides and nucleic acids	7
	metabolism of lipids	12
	metabolism of coenzymes and prosthetic groups	9
	metabolism of phosphate	4
	metabolism of sulfur	1
Information pathways		21
	DNA restriction/modification and repair	2
	Transcription regulation	6
	ribosomal proteins	1
	protein modification	4
	Protein folding	8
Other functions		60
Unknown		490