Table 3.

Energetic costs and MCU within functional classes of E. coli proteins

Functional classification	No. of genes	rS	Z
Transport + binding proteins	251	−0.084	1.33
Putative enzymes	237	−0.113	1.74
Energy metabolism	211	−0.079	1.15
Central intermediary metabolism	159	−0.217	2.78*
Cell processes (including adaptation, protection)	155	−0.177	2.22
Translation, post-translational modification	151	−0.236	2.96*
Cell structure	138	−0.168	1.99
Putative transport proteins	132	−0.213	2.48
Putative regulatory proteins	120	−0.318	3.65*
Carbon compound catabolism	112	−0.113	1.19
Amino acid biosynthesis + metabolism	111	−0.045	0.47
DNA replication, recombination, modification + repair	100	−0.408	4.42*
Biosynthesis of cofactors, prosthetic groups + carriers	96	−0.196	1.94
Nucleotide biosynthesis + metabolism	57	−0.211	1.60
Transcription, RNA processing, degradation	48	−0.265	1.86
Fatty acid + phospholipid metabolism	47	−0.372	2.69
Regulatory function	42	−0.045	0.29
Structural proteins	38	−0.172	1.05

Functional categories are from Blattner et al. (27). See Table 2 legend.