Table S1.

Amount of precursor 17S rRNA in various ribosomal fractions of the strains analyzed

Strain name	Description*	Sucrose gradient fraction
		No. 5, pre-30S	No. 6, pre-30S	No. 7, 30S	No. 8, 30S	Nos. 13/14, 70S
MRG03	WT	58.0 ± 5.9 (n = 4)	42.3 ± 2.9 (n = 5)	35.6 ± 3.6 (n = 5)	29.9 ± 3.9 (n = 5)	7.6 ± 2.4 (n = 5)
MRG07	∆rsgA	75.3 ± 4.1 (n = 3)	75.1 ± 3.6 (n = 3)	71.7 ± 3.6 (n = 3)	75.5 ± 5.2 (n = 3)	37.2 ± 2.7 (n = 3)
MRG08	∆rsgA (pRGSA)	67.2 ± 4.9 (n = 3)	43.1 ± 8.5 (n = 3)	28.9 ± 8.5 (n = 3)	28.9 ± 5.7 (n = 3)	9.3 ± 0.5 (n = 3)
MRG04	∆lepA	69.8 ± 2.3 (n = 5)	54.4 ± 2.1 (n = 5)	49.1 ± 4.3 (n = 5)	37.2 ± 5.9 (n = 5)	9.7 ± 3.6 (n = 5)
MRG05	∆lepA (pLEPA)	65.9 ± 4.8 (n = 6)	40.5 ± 3.4 (n = 6)	35.2 ± 4.4 (n = 6)	21.0 ± 4.3 (n = 6)	7.2 ± 1.1 (n = 6)
MRG102	∆lepA (pRB34)	73.9 ± 1.3 (n = 3)	56.1 ± 0.7 (n = 3)	43.8 ± 2.6 (n = 3)	35.7 ± 2.8 (n = 3)	10.1 ± 0.7 (n = 3)

Data correspond to percent of total SSU rRNA (mean ± SEM), with the number of independent replicas (n) indicated.

^*All strains are isogenic and carry either the plasmid indicated or the empty vector.