TABLE 2.

Categorized functions of identified proteins showing different expression levels under PHB-producing versus non-PHB-producing conditions

Spot no.	Category	Gene	Proteina	pl/mol massb
	Cell process
1	Chaperoning	dnaK	DnaK, chaperone for Hsp70	4.81/69.6
2	Chaperoning	groEL	GroEL, chaperone for Hsp60	4.85/57.3
11	Chaperoning	groES	GroES, chaperone for Hsp10	5.15/10.4
6	Transport-binding	rbsB	RbsB, d-ribose periplasmic binding protein	6.85/30.9
	Energy metabolism
4	Glycolysis	fba	Fba, fructose-bisphosphate aldolase, class II	5.52/39.2
7	Glycolysis	gpmA	GpmA, phosphoglycerate mutase	5.85/28.5
8	Glycolysis	tpiA	TpiA, triosephosphate isomerase	5.64/27.0
9	Entner-Doudoroff pathway	eda	Eda, 2-oxo-3-deoxy-6-phosphogluconate aldolase (2-keto-4-hydroxyglutarate aldolase)	5.57/22.3
	Central intermediary metabolism
5	General	kba	Kba, d-tagatose-1,6-bisphosphate aldolase	5.98/31.1
	Macromolecular metabolism
3	Protein translation and modification	tufA	EF-Tu, protein chain elongation factor	5.3/43.3
	Other
10	Adaptation	dps	Dps, DNA protection protein during starvation	5.72/18.7
13	Broad regulatory functions	relB	RelB, negative regulator of translation	4.81/9.1
12	Unknown function	yfiD	YfiD, 14.3-kDa hypothetical protein	5.09/14.3

^aProteins were identified by the peptide fingerprinting method. The ProteinProspector server was used for the identification of proteins, and SWISS-PROT was used as a reference database. 

^bMolecular masses are shown in kilodaltons.