Table 1 Mutations found in E. coli MG1655 (lac plus) after 1000 generations of LSMMG

From: The adaptation of Escherichia coli cells grown in simulated microgravity for an extended period is both phenotypic and genomic

Position

Type of change

Mutation type

Annotation

Gene

Usual product

Function

54,033

G→T

Base change

Q224K (CAG→AAG)

surA a

Periplasmic peptidyl-prolyl isomerase

Outer membrane protein folding

326,446

C→T

Base change

G9D (GGT→GAT)

betA

Choline dehydrogenase (flavoprotein)

Protection against osmotic stress

3,015,315

G→A

Base change

G412R (GGA→AGA)

ygfK

Possible oxidoreductase, Fe—S subunit

Putative selenate reductase

4,031,240

G→A

Base change

G25R (GGG→AGG)

trkH

Potassium transporter

Transport

4,546,957

G→C

Base change

V43L (GTA→CTA)

fimH

Minor type 1 fimbriae subunit

d-Mannose-specific adhesin

547,694

A→G

Base change

Pseudogene (139/252 nt)

ylbE c

C‑terminal fragment (pseudogene)

Two mutations make ORF

547,831

+G

Base insertion/addition

Pseudogene (2/252 nt)

ylbE c

C‑terminal fragment (pseudogene)

unknown function

169,483

Δ1 bp

Base deletion

Coding (2000/2244 nt)

fhuA

ferrichrome outer membrane transporter

Outer membrane transport

1,976,527

Δ776 bp

Base deletion

Intergenic

insBinsA

1,050,465

T→A

Base change

Intergenic (−67/−219)

cspH←/→cspG

3,957,957

C→T

Base change

Intergenic (−121/+78)

ppiC←/←yifN

1,905,401

IS1 (+)+9 bp

Transposon MRb

coding (51–59/210 nt)

cspC

Deletes CspA-family stress protein

Stress

1,977,510

IS5 (+)+4 bp

Transposon MR

intergenic (−271/−264)

insA←/→uspC

 

2,175,275

IS1 (+)+9 bp

Transposon MR

intergenic (−49/+251)

gatY←/←fbaB

 

3,580,708

IS5 (–)+4 bp

Transposon MR

coding (823–826/1179 nt)

yhhZ

Deletes conserved hypothetical protein

 

4,540,601

IS1 (+)+9 bp

Transposon MR

coding (542–550/597 nt)

fimE

Deletes tyrosine recombinase

Inversion of on/off fimA regulator

  1. IS insertion sequence
  2. a functional gene product aids proper folding of outer membrane proteins OmpA, OmpF and LamB, disrupted and likely dysfunctional
  3. b Transposon-mediated rearrangement
  4. c function of product unknown
  5. ←gene orientation on reverse strand
  6. →gene orientation on positive strand
  7. ←/→intergenic
  8. Δ deletion