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Complete genome sequence of Streptosporangium roseum type strain (NI 9100T)

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Standards in Genomic Sciences20102:2010029

https://doi.org/10.4056/sigs.631049

©  The Author(s) 2010

  • Published:

Abstract

Streptosporangium roseum Crauch 1955 is the type strain of the species which is the type species of the genus Streptosporangium. The ‘pinkish coiled Streptomyces-like organism with a spore case’ was isolated from vegetable garden soil in 1955. Here we describe the features of this organism, together with the complete genome sequence and annotation. This is the first completed genome sequence of a member of the family Streptosporangiaceae, and the second largest microbial genome sequence ever deciphered. The 10,369,518 bp long genome with its 9421 protein-coding and 80 RNA genes is a part of the Genomic Encyclopedia of Bacteria and Archaea project.

Keywords

  • sporangia
  • vegetative and aerial mycelia
  • aerobic
  • non-motile
  • non-motile spores
  • Gram-positive
  • Streptosporangiaceae
  • S. cloviforme
  • GEBA

Introduction

Strain NI 9100T (= DSM 43021 = ATCC 12428 = JCM 3005) is the type strain of the species Streptosporangium roseum, which is the type species of the genus Streptosporangium, the type genus of the actinobacterial suborder Streptosporanineae [1–4]. S. roseum NI 9100T was isolated from vegetable garden soil and first described by Crouch in 1955 [2,4]. The name derives from ‘strepto’ from Greek meaning ‘coiled’ combined with ‘sporangium’, Latin for ‘spore case’, to mean ‘streptomyces-like’ but with sporangia [2,4]. The species epithet ‘roseum’ derives from the pinkish color on potato dextrose agar [2]. Here we present a summary classification and a set of features for S. roseum NI 9100T, together with the description of the complete genomic sequencing and annotation.

Classification and features

The 16S rRNA genes of the thirteen other validly named species currently ascribed to the genus Streptosporangium share 96–100% (S. vulgare [5]) sequence identity with NI 9100T, but S. claviforme (94%) [6,7] apparently does not belong to this genus (but to the genus Herbidospora) and thus has been excluded from phylogenetic analysis (see below). Two reference strains, DSM 43871 (X89949), and DSM 44111 (X89947), differ by just one nucleotide from strain NI 9100T, whereas the effectively published named species ‘S. koreanum’ DSM 44110 [99.9%, 5], ‘S. brasiliense’ DSM 44109 [99.4%, 5] and ‘S. rubrum’ DSM 44095 [99.4%, 5] appear to members of the genus. Members of the species and genus are rare in nature, at least based on the habitats screened thus far as 16S rRNA in environmental samples and metagenomic surveys do not exceed 88–91% sequence similarity to the 16S rRNA gene sequence of strain NI 9100T (U48996, X70425, X89947; status August 2009). Figure 1a and Figure 1b show the phylogenetic neighborhood of S. roseum NI 9100T in a 16S rRNA based tree. The sequence of the six 16S rRNA gene copies in the genome do not differ from each other, and are identical to the previously published sequence generated from DSM 43021 (X89947), whereas the sequence generated in the same year from the JCM 3005 version of strain 9100T (U48996) differs by 24 nucleotides (1.7%).
Figure 1a.
Figure 1a.

Phylogenetic tree highlighting the position of S. roseum NI 9100T relative to the type strains of the other species within the genus (1a) except for S. claviforme (see text). The tree was inferred from 1,411 and aligned characters [8,9] of the 16S rRNA gene sequence under the maximum likelihood criterion [10] and either rooted with the results of Figure 1b (Figure 1a) or rooted in accordance with the current taxonomy. The branches are scaled in terms of the expected number of substitutions per site. Numbers above branches are support values from 1,000 bootstrap replicates if larger than 60%. Lineages with type strain genome sequencing projects registered in GOLD [11] are shown in blue, published genomes in bold.

Figure 1b.
Figure 1b.

Phylogenetic tree highlighting the position of S. roseum NI 9100T relative to the type strains of the other genera within the family Streptosporanginea. The tree was inferred from 1,369 aligned characters [8,9] of the 16S rRNA gene sequence under the maximum likelihood criterion [10] and either rooted with the results of Figure 1b (Figure 1a) or rooted in accordance with the current taxonomy. The branches are scaled in terms of the expected number of substitutions per site. Numbers above branches are support values from 1,000 bootstrap replicates if larger than 60%. Lineages with type strain genome sequencing projects registered in GOLD [11] are shown in blue, published genomes in bold.

A summary of the classification and features for S. roseum is listed in Table 1. We draw attention to the reader that we find quite an amount of contradictive results between old and more recent literature (see below). A potential but not ultimate source for this observation could be the usage of different experimental methods. A variety of media were used in the original description pertaining to cellular and mycelium morphology on (Figure 2).
Figure 2.
Figure 2.

Scanning electron micrograph of S. roseum NI 9100T

Table 1.

Classification and general features of S. roseum NI 9100T according to the MIGS recommendations [12]

MIGS ID

Property

Term

Evidence code

 

Current classification

Domain Bacteria

TAS [13]

 

Phylum Actinobacteria

TAS [14]

 

Class Actinobacteria

TAS [15]

 

Subclass Actinobacteridae

TAS [15]

 

Order Actinomycetales

TAS [15]

 

Suborder Streptosporangineae

TAS [15]

 

Family Streptosporangiaceae

TAS [16,17]

 

Genus Streptosporangium

TAS [1–4]

 

Species Streptosporangium roseum

TAS [1–4]

 

Type strain NI 9100

 
 

Gram stain

not tested, probably positive

NAS [15,16]

 

Cell shape

produces aerial mycelium

TAS [2]

 

Motility

non-motile

TAS [2]

 

Sporulation

non-motile spores

TAS [2]

 

Temperature range

mesophile, temperature range not determined, does not grow at 42°C

TAS [1,18]

 

Optimum temperature

28°C

TAS [1,18]

 

Salinity

2.5% NaCl

TAS [19,20]

MIGS-22

Oxygen requirement

aerobic

TAS [2]

 

Carbon source

several (see text), but be aware of contradicting results

TAS [19–21]

 

Energy source

carbohydrates

TAS [19-21]

MIGS-6

Habitat

soil

TAS [2]

MIGS-15

Biotic relationship

free living

TAS [2]

MIGS-14

Pathogenicity

non pathogenic

NAS

 

Biosafety level

1

TAS [22]

 

Isolation

vegetable garden soil

TAS [2]

MIGS-4

Geographic location

most probably Chapel Hill, North Carolina, USA

TAS [2]

MIGS-5

Sample collection time

1955 or before

TAS [2]

MIGS-4.1

Latitude, Longitude

35.913, −79.055

NAS

MIGS-4.2

MIGS-4.3

Depth

not reported

 

MIGS-4.4

Altitude

not reported

 

Evidence codes - IDA: Inferred from Direct Assay (first time in publication); TAS: Traceable Author Statement (i.e., a direct report exists in the literature); NAS: Non-traceable Author Statement (i.e., not directly observed for the living, isolated sample, but based on a generally accepted property for the species, or anecdotal evidence). These evidence codes are from of the Gene Ontology project [23]. If the evidence code is IDA, then the property was directly observed for a live isolate by one of the authors or an expert or mentioned in the acknowledgements.

The color of the substrate mycelium is red-brown to yellow-brown [2,24]. Strain NI 9100T utilizes glucose, arabinose, sucrose, xylose, fructose, and raffinose, but not inositol, mannose, rhamnose, or cellulose [19,20]. The strain is positive for arginine dihydrolase and acetoin production (Voges Proskauer test), weakly positive for citrate utilization, lysine decarboxylase, and ornithine decarboxylase, and negative for Kohn’s gelatin gelatinase, urease, o-nitro-phenyl-galactoside β-galactosidase, tryptophan desaminase, tryptophan indole production, H2S production from sodium thiosulfate [19,20]. Starch hydrolysis and nitrate reduction are positive, but growth at 42°C and iodinin production are negative [24]. Mertz and Yao [18] reported that strain NI 9100T can utilize glycerol, arabinose, rhamnose and inositol, which is in part contradictory to other results [20,21]. Gelatin is liquefied, milk is peptonized and red-brown to purple-brown soluble pigments are produced [18]. Zhang et al. [21] describe strain NI 9100T as utilizing sorbitol and sorbose but to be negative for L-arabinose, erythrose, D-fructose, D-galactose, inositol, D-mannose, maltose, raffinose, and rhamnose, which again is in part in conflict with other studies [18–20]. Strain NI 9100T produces a secondary metabolite, the antibiotic angucycline WS 79089B, which is an inhibitor of the endothelin-converting enzyme [20]. In contrast to S. carneum, strain NI 9100T does not produce an antibiotic against Staphylococcus aureus [18].

The characteristics of the ribosomal protein AT-L30 of strain S. roseum JCM2178T in comparison to other bacteria of the genus Streptosporangium is described elsewhere [25]. These data should be taken cautiously, as according to the Japanese Collection of Microorganisms (JCM) catalogue the strain number “JCM2178” is affiliated with Aspergillus oryzae (accessed to JCM in August 09), hence the true nature of strain S. roseum JCM2178T in the study of Ochi [25] is unclear.

Chemotaxonomy

The major fatty acids (relative ratio %) are iso-C16:0 (40.0), C17:0 10-methyl (23.0), C16:0 (1.95), C16:0 10-methyl (6.0), iso-C14:0 (14.0) (Reiner Kroppenstedt, personal communication). Partly different fatty acid patterns are reported elsewhere [18–20,26,27]. The proportions of diaminopimelic acid (A2pm) in the cell wall of strain S. roseum NI 9100T are 71% meso-A2pm and 29% LL-A2pm [26]. The phospholipids of strain S. roseum NI 9100T are phosphatidylethanolamine, hydroxyphosphatidylethanolamine, ninhydrin-positive and sugar-positive phospholipids, disphosphatidylglycerol, and posphatidylinositol [1]. The menaquinone compositions are MK-9 (III, VIII-H4) (56.5%), MK-9 (H2) (37.8%), MK-9 (H0) (5.0%), and MK-9 (H6) (0.7%) [1]. Galactose and madurose are present in whole cell sugars extracts, rhamnose is absent [1]. In general, the genus Streptosporangium is characterized by the whole-cell sugar type B or C, the phospholipid type IV and of the fatty acid type 3c [1].

Genome sequencing and annotation

Genome project history

This organism was selected for sequencing on the basis of its phylogenetic position, and is part of the Genomic Encyclopedia of Bacteria and Archaea project. The genome project is deposited in the Genome OnLine Database [11] and the complete genome sequence is deposited in GenBank. Sequencing, finishing and annotation were performed by the DOE Joint Genome Institute (JGI). A summary of the project information is shown in Table 2.
Table 2.

Genome sequencing project information

MIGS ID

Property

Term

MIGS-31

Finishing quality

Finished

MIGS-28

Libraries used

Two Sanger libraries: 6kb pMCL200 and fosmid pcc1Fos One 454 Pyrosequence standard library

MIGS-29

Sequencing platforms

ABI3730, 454 GS FLX

MIGS-31.2

Sequencing coverage

8.45× Sanger; 27.6× Pyrosequence

MIGS-30

Assemblers

Newbler, phrap

MIGS-32

Gene calling method

Prodigal, GenePrimp

 

INSDC ID

CP001814 (genome), CP001815 (plasmid)

 

Genbank Date of Release

December 10, 2009

 

GOLD ID

Gc01156

 

NCBI project ID

21083

 

Database: IMG-GEBA

2501799901

MIGS-13

Source material identifier

DSM 43021

 

Project relevance

Tree of Life, GEBA

Growth conditions and DNA isolation

S. roseum NI 9100T, DSM 43021, was grown in DSMZ medium 535, Trypticase Soy Broth [28], at 28°C. DNA was isolated from 0.5–1 g of cell paste using the JGI CTAP procedure with modification ALM as described in [29].

Genome sequencing and assembly

The genome was sequenced using a combination of Sanger and 454 sequencing platforms. All general aspects of library construction and sequencing performed at the JGI can be found at http://www.jgi.doe.gov/. 454 Pyrosequencing reads were assembled using the Newbler assembler version 1.1.02.15 (Roche). Large Newbler contigs were broken into 11,709 overlapping fragments of 1,000 bp and entered into assembly as pseudo-reads. The sequences were assigned quality scores based on Newbler consensus q-scores with modifications to account for overlap redundancy and to adjust inflated q-scores. A hybrid 454/Sanger assembly was made using the parallel phrap assembler (High Performance Software, LLC). Possible mis-assemblies were corrected with Dupfinisher [30] or transposon bombing of bridging clones (Epicentre Biotechnologies, Madison, WI). Gaps between contigs were closed by editing in Consed, custom primer walk or PCR amplification. A total of 2,837 Sanger finishing reads were produced to close gaps, to resolve repetitive regions, and to raise the quality of the finished sequence. The error rate of the completed genome sequence is less than 1 in 100,000. Together all sequence types provided 36.05× coverage of the genome. The final assembly contains 128,042 Sanger and 1,033,578 Pyrosequence reads.

Genome annotation

Genes were identified using Prodigal [31] as part of the Oak Ridge National Laboratory genome annotation pipeline, followed by a round of manual curation using the JGI GenePRIMP pipeline (http://geneprimp.jgi-psf.org) [32]. The predicted CDSs were translated and used to search the National Center for Biotechnology Information (NCBI) nonredundant database, UniProt, TIGRFam, Pfam, PRIAM, KEGG, COG, and InterPro databases. Additional gene prediction analysis and functional annotation was performed within the Integrated Microbial Genomes - Expert Review (IMG-ER) platform [33].

Genome properties

The genome consists of a 10,341,314 bp long chromosome and a small 28,204 bp plasmid with a 70.9% GC content (Table 3 and Figure 3). Of the 9,501 genes predicted, 9,421 were protein coding genes, and 80 RNAs. In addition, 446 pseudogenes were identified. The majority of protein-coding genes (62.5%) were assigned a putative function while those remaining were annotated as hypothetical proteins. The distribution of genes into COGs functional categories is presented in Table 4.
Figure 3.
Figure 3.

Graphical circular map of the genome; plasmid not to scale. From outside to the center: Genes on forward strand (color by COG categories), Genes on reverse strand (color by COG categories), RNA genes (tRNAs green, rRNAs red, other RNAs black), GC content, GC skew.

Table 3.

Genome Statistics

Attribute

Value

% of Total

Genome size (bp)

10,369,518

100.00%

DNA coding region (bp)

9,121,910

87.97%

DNA G+C content (bp)

7,348,162

70.86%

Number of replicons

2

 

Extrachromosomal elements

1

 

Total genes

9,501

100.00%

RNA genes

80

0.84%

rRNA operons

6

 

Protein-coding genes

9,421

99.16%

Pseudo genes

446

4.49%

Genes with function prediction

5,939

62.47%

Genes in paralog clusters

2,792

29.37%

Genes assigned to COGs

6,224

65.47%

Genes assigned Pfam domains

6,596

69.38%

Genes with signal peptides

2,248

23.65%

Genes with transmembrane helices

2,235

23.51%

CRISPR repeats

0

 
Table 4.

Number of genes associated with the general COG functional categories

Code

value

% age

Description

J

226

2.4

Translation, ribosomal structure and biogenesis

A

1

0.0

RNA processing and modification

K

966

10.3

Transcription

L

293

3.1

Replication, recombination and repair

B

1

0.0

Chromatin structure and dynamics

D

38

0.4

Cell cycle control, mitosis and meiosis

Y

0

0.0

Nuclear structure

V

189

2.0

Defense mechanisms

T

511

5.4

Signal transduction mechanisms

M

298

3.2

Cell wall/membrane biogenesis

N

2

0.0

Cell motility

Z

1

0.0

Cytoskeleton

W

0

0.0

Extracellular structures

U

43

0.5

Intracellular trafficking and secretion

O

167

1.8

Posttranslational modification, protein turnover, chaperones

C

424

4.5

Energy production and conversion

G

639

6.8

Carbohydrate transport and metabolism

E

600

6.4

Amino acid transport and metabolism

F

124

1.3

Nucleotide transport and metabolism

H

254

2.7

Coenzyme transport and metabolism

I

306

3.2

Lipid transport and metabolism

P

320

3.4

Inorganic ion transport and metabolism

Q

315

3.3

Secondary metabolites biosynthesis, transport and catabolism

R

974

10.3

General function prediction only

S

473

5.0

Function unknown

-

3187

33.8

Not in COGs

Declarations

Acknowledgements

We would like to gratefully acknowledge the help of Susanne Schneider (DSMZ) for DNA extraction and quality analysis. This work was performed under the auspices of the US Department of Energy’s Office of Science, Biological and Environmental Research Program, and by the University of California, Lawrence Berkeley National Laboratory under contract No. DE-AC02-05CH11231, Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344, and Los Alamos National Laboratory under contract No. DE-AC02-06NA25396, as well as German Research Foundation (DFG) INST 599/1-1.

Authors’ Affiliations

(1)
DOE Joint Genome Institute, Walnut Creek, California, USA
(2)
DSMZ - German Collection of Microorganisms and Cell Cultures GmbH, Braunschweig, Germany
(3)
Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico, USA
(4)
Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
(5)
Biological Data Management and Technology Center, Lawrence Berkeley National Laboratory, Berkeley, California, USA
(6)
HZI - Helmholtz Centre for Infection Research, Braunschweig, Germany
(7)
University of California Davis Genome Center, Davis, California, USA

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