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Table 1 First compilation of S. meliloti chromosomal IgRs predicted to encode sRNAs.

From: Prediction of Sinorhizobium meliloti sRNA genes and experimental detection in strain 2011

IgR#

Found

by1

Adjacent

genes2

sRNA

strand2

Prom.?3

Term.?3

Blast hits

in4

Expected

size5

Band size in

Northern blot

Microarray

detection7

Gene8

Reference

1

Rfam

SMc03975> SMc03976<

<

s70

n

eubacteria

~160 nt

~155 nt

<, H, C, S, A, B, O

(2972187–2972236)

6S RNA

(smrC22 = sra56)

[26, 27, 62, 67]

2

OT

SMc04042< SMc04043<

>

NN – s70

y

Sm Rl Re At

~80 nt

duplet < 100 nt

-

sm8 = suhB

[65, 67], this work

3

SP

SMc01933< proS>

<

NN – s70

y

Sm Re Rl At Ml

~150 nt

~165 nt

<, A, C, H, S

(1398340–1398389 1398389–1398340)

smrC9 = sra32

[26, 27]

4

tR

Gln-tRNA< SMc00810>

<

-

y

Sm Re Rl

?

multiple ~150 $~& 80 nt mainly

-

sm137

this work

5

tR

SMc02151< Thr-tRNA<

>

NN – s70

y

-

~240 nt

no bands detected

>, S (*)

(560802–560753)

sra12

[27]

6

OT

gltB< SMc04029>

>

NN

y

Sm Re Rl

~100–200 nt

not done 6

>, A, C

(3031662–3031711)

-

this work

7

OT

SMc04453< SMc01885>

<

NN

y

Sm Re Rl

~390 nt

duplet, ~135 & ~200 nt

<, A, C, O, S

(2321429–2321478)

sm26

this work

8

OT

SMc01257< sda>

>

NN – s70 – PhoB

y

Sm At Oa Msp

~170 nt

not done 6

-

sm30

this work

9

OT

thdF< rho<

>

s70

y

Sm

~180 nt

not done

-

sm130

this work

10

SP

SMc00034> SMc00096<

>

s70

y

Sm Re Rl

~190 nt

~175 nt

-

sra25

[27]

11

SP

SMc00108< SMc00109<

<

s70

y

Sm Rl Re At

~100–120 nt

duplet, ~120 $~& 110 nt

-

sm145

this work

12

SP

celR2> rpmG<

>

s70

y

Sm Rl Re At Ml Msp Ac

~150 nt

not done 6

>, A, B, C, H, O, S

(1411684–1411733 1411738–1411689)

smrC10 = sra33

[26, 27]

13

SP

polA< SMc02851>

>

NN – s70

y

Sm Rl Re At

~150 nt

duplet, ~140 & ~90 nt

-

smrC7 = sra03

[26, 27]

14

SP

SMc02910< SMc02911>

>

s70

y

Sm Re Rl At Ml Bo Oa

~60–150 nt

multiple, ~90–100 & ~180–210

>, B, C, O,

(267010–267059 267059–267010)

sm76

this work

15

SP

SMc03988> SMc03989>

>

s70

y

Sm Rl Re At

~110 nt

~80 nt

>, A, B, C, H, O, S

(2986452–2986501 2986508–2986459)

sm84

this work

16

SP

atpH< SMc02497<

>

s70

y

Sm Rl Re At

~110 nt

~100 nt

-

sm270

this work

17

SP

dapF< ffh>

>

s70

y

Sm Rl Re At

~120 nt

not done

>, A, B, O, S

(3522279–3522328)

sm5

this work

18

OT

SMc00821> SMc00822>

>

-

y

Sm Re Rl

~80 nt

not done

>, A, C, H, O, S

(843459–843508 843508–843459)

sm190

this work

  1. 1 Rfam, RNA families database [33, 67]; OT, IgR with annotated orphan terminator; tR, IgR flanking tRNAs; SP, sRNAPredictHT.
  2. 2 The transcribed strand is indicated (>, forward; <, reverse)
  3. 3 Putative promoter sequence detected by conservation in sequence alignment, search of consensus sequences or neural network promoter prediction. s70, sequence highly similar to the S. meliloti constitutive promoter consensus sequence [49]; NN, neural network promoter prediction [47]; PhoB, sequence detected with homology to the PhoB transcriptional regulator binding consensus [51].
  4. 4 Sm, Sinorhizobium medicae WSM419; Rl, Rhizobium leguminosarum biovar viciae 3841; Re, Rhizobium etli CFN42; At, Agrobacterium tumefaciens C58; Ml, Mesorhizobium loti MAFF303099; Oa, Ochrobactrum anthropi ATCC49188; Msp, Mesorhizobium sp. BNC1; Bo, Brucella ovis ATCC25840.
  5. 5 Approximate length of sRNA based on putative 5' and 3' ends.
  6. 6 PCR failed to amplify the IgR.
  7. 7 Detection on the oligonucleotide microarray Sm14kOLI. > and < denote the orientation of the detected signal (absolute M-value ≥ 2.5 represents an enrichment of small RNA transcripts). A, B, C, H, O and S denote the stress condition under which the signal was detected (A, acidic; B, basic; C, cold shock; H, heat shock; O, oxidative, S, saline). The coordinates of the oligonucleotide probes that gave positive signals are indicated in brackets. -, not detected under the conditions studied. (*), M-value ≥ 2.
  8. 8 Gene name as designated in the literature (smrC#, sra#) [26, 27]or according to our predictive scheme (sm#).