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coronaViruses

CoronaViruses Sequence Comparison

原创 proteinn 蛋白质工厂 昨天

On February 11, 2020, the World Health Organization WHO named the viral respiratory disease in humans originated from Wuhan, China, as   coronavirus disease 2019 (abbreviated “COVID-19”). COVID-19 is associated with a new RNA coronavirus (2019-nCoV). 

Severe acute respiratory syndrome (SARS) is a viral respiratory illness caused by a coronavirus called SARS-associated coronavirus (SARS-CoV). SARS was first reported in Asia in February 2003. The illness spread to more than two dozen countries in North America, South America, Europe, and Asia before the SARS global outbreak of 2003 was contained.

Middle East Respiratory Syndrome (MERS) is an illness caused by a virus (more specifically, a coronavirus) called Middle East Respiratory Syndrome Coronavirus (MERS-CoV). Most MERS patients developed severe respiratory illness with symptoms of fever, cough and shortness of breath. About 3 or 4 out of every 10 patients reported with MERS have died.

Figure 1.Schematics of 2019-nCoV, SARS-CoV, MERS-CoV genome, ORF and protein.

The following analysis is based on the most up-to-date 2019-nCoV genome sequence Refseq: NC_045512 [1]



Genome

For genome sequence, the 2019-nCoV RNA (29903 bases) shares 80.08% homology to SARS-CoV (29751 bases, Refseq. NC_004718), 58.79% to MERS-CoV (30119 bases, Refseq. NC_019843). The homology between SARS-CoV and MERS-CoV genome sequences is 47.07%.



Table 1.Orthogonal Array of 3 Genomic RNAs Homology.

Homology
2019-nCoV
29903 b
SARS-nCoV
29751 b
MERS-nCoV
30119 b
2019-nCoVRefseq. NC_045512
100%
80.08%
58.79%
SARS-CoV
Refseq. NC_004718

100%
47.07%
MERS-CoV
Refseq. NC_019843


100%



Picture from [2]


Protein
The 2019-nCoV encodes 15 ORFs, 28 proteins,with 1 more ORF than SARS-nCoV (14 ORFs, 27 proteins) , 4 more ORFs than MERS-nCoV (11 ORFs, 24 proteins).


Table 2. Number of ORF and Protein in the 3 coronaviruses.

Number

ORF

Protein

2019-nCoV

15

28

SARS-nCoV

14

27

MERS-nCoV

11

24



Among the 15 ORFs, two ORFs (orf6, orf7a) are not found in SARS-CoV or MERS-CoV, thus unique to 2019-nCoV.  2019-nCoV lacks one ORF (orf9b) that only exists in SARS-nCoV, and three ORFs (orf4a, orf4b, orf5) that only exist in MERS-nCoV.


Table 3. Proteins encoded in the 3 coronaviruses.

Protein\Residue Number

2019-nCoV

SARS-nCoV

MERS-nCoV

5' UTR

/

/

/

Host translation inhibitor NSP1

180

180

193

Non-structural protein 2

638

638

660

Papain-like proteinase

1945

1922

1887

Non-structural protein 4

500

500

507

3C-like proteinase

306

306

306

Non-structural protein 6

290

290

292

Non-structural protein 7

83

83

83

Non-structural protein 8

198

198

199

Non-structural protein 9

113

113

110

Non-structural protein 10

139

139

140

RNA-directed RNA polymerase

932

932

933

Helicase

601

601

598

Guanine-N7 methyltransferase

527

527

524

Uridylate-specific endoribonuclease

346

346

343

2'-O-methyltransferase

298

210

303

Spike glycoprotein (S)

1273

1255

1353

orf 3a

275

274

103

Envelope protein (E)

75

76

82

Membrane glycoprotein (M)

222

221

219

orf 4a

/

/

109

orf 4b

/

/

246

orf 5

/

/

224

orf 6

61

63

/

orf 7a

121

122

/

orf 8

121

84

112

Nucleocapsid phosphoprotein (N)

419

422

413

orf9b

/

98

/

orf 10

38

/

/

3' UTR

/

/

/

a. The length of each protein is displayed. .

b. / means that no protein is encoded.



Table 4. Protein Homology in the 3 coronaviruses.

Protein Name\Identity

2019-n/SARS

2019-n/MERS

SARS/MERS

Host translation inhibitor NSP1

84.4%

25.7%

25.0%

Non-structural protein 2

68.3%

21.4%

21.9%

Papain-like proteinase

76.7%

33.2%

32.9%

Non-structural protein 4

80.0%

39.6%

38.2%

3C-like proteinase

96.8%

50.8%

51.8%

Non-structural protein 6

87.2%

34.8%

34.8%

Non-structural protein 7

98.8%

55.4%

55.4%

Non-structural protein 8

97.5%

52.8%

52.3%

Non-structural protein 9

97.4%

53.6%

53.6%

Non-structural protein 10

97.1%

59.0%

59.0%

RNA-directed RNA polymerase

96.4%

72.6%

72.3%

Helicase

99.8%

71.6%

71.6%

Guanine-N7 methyltransferase

95.1%

63.4%

63.2%

Uridylate-specific endoribonuclease

88.7%

51.8%

50.0%

2'-O-methyltransferase

93.3%

66.1%

65.1%

Spike glycoprotein (S)

77.7%

33.3%

33.7%

orf 3a

72.9%

7.2%

8.3%

orf 3b

7.8%

/

/

Envelope protein (E)

93.2%

36.5%

36.8%

Membrane glycoprotein (M)

91.0%

40.2%

42.0%

orf 7a

86.0%

/

/

orf 7b

83.3%

/

/

orf 8

57.0%

17.1%

16.2%

Nucleocapsid phosphoprotein (N)

91.2%

49.9%

49.6%

orf 9a

73.2%

/

/

orf 14

77.1%

/

/



References.

1. Wuhan seafood market pneumonia virus isolate Wuhan-Hu-1, complete genome. NCBI Reference Sequence: NC_045512.2 

https://www.ncbi.nlm.nih.gov/nuccore/1798174254


2. A decade after SARS: strategies for controlling emerging coronaviruses. Graham RL1, Donaldson EF, Baric RS. Nat Rev Microbiol. 2013 Dec;11(12):836-48.

3. Original Analysis by TT Hang, KK Zheng, XQ Ju, M Guo, Kangma-
Healthcode.com

4. Full genome alignment of 2019-nCoV, SARS-CoV, MERS-CoV can be found at 
OurProteinFactory.com/2019-nCoV/genomealign



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