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. 2003 Oct;185(19):5673–5684. doi: 10.1128/JB.185.19.5673-5684.2003

TABLE 2.

Distribution of essential and nonessential genes and average ERIs in selected functional categoriesa

Functional category Description Total no. of ORFs No. E No. N No. ? No. ND % E Mean ERI
AAM Amino acid metabolism 138 21 108 1 8 15 0.5
CHM Carbohydrate metabolism 219 21 178 3 17 10 0.4
NCM Nucleotide and cofactor metabolism 181 53 119 2 7 29 0.5
LPC Lipid, lipopolysaccharide, lipoprotein, peptidoglycan, and cell wall biosynthesis 126 34 73 5 14 27 0.5
NAM Nucleic acid metabolism 156 43 96 5 12 28 0.6
PMS Protein metabolism and secretion 167 80 57 18 12 48 0.7
MSM Miscellaneous metabolism 94 14 72 2 6 15 0.4
BEN Bioenergetics 100 15 75 4 6 15 0.3
SMC Signaling, motility, and chemotaxis 153 12 125 3 13 8 0.3
RCD Expression regulation and cell cycle and division 177 30 118 13 16 17 0.2
MTR Membrane transport 276 22 244 3 7 8 0.3
PHT Phage- and transposase-related processes 62 12 35 2 13 19 0.3
CAT All categorized 1,849 357 1,300 61 131 19 0.4
UNC Uncategorized 2,442 263 1,826 157 196 11 0.2
Total Categorized and uncategorized 4,291 620 3,126 218 327 14 0.3
a

Abbreviations are as follows: E, essential; N, nonessential; ND, not determined; ?, ambiguous.

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