Granadaene

Last updated
Granadaene
Granadaene.svg
Names
IUPAC name
(2S)-5-Amino-2-[[(2E,4E,6E,8E,10E,12E,14E,16E,18E,20E,22E,24E)-27-[(2R,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoctacosa-2,4,6,8,10,12,14,16,18,20,22,24-dodecaenoyl]amino]pentanoic acid
Identifiers
3D model (JSmol)
ChemSpider
PubChem CID
  • InChI=1S/C39H52N2O8/c1-31(48-39-37(45)36(44)35(43)32(2)49-39)27-24-22-20-18-16-14-12-10-8-6-4-3-5-7-9-11-13-15-17-19-21-23-25-29-34(42)41-33(38(46)47)28-26-30-40/h3-25,29,31-33,35-37,39,43-45H,26-28,30,40H2,1-2H3,(H,41,42)(H,46,47)/b4-3+,7-5+,8-6+,11-9+,12-10+,15-13+,16-14+,19-17+,20-18+,23-21+,24-22+,29-25+/t31?,32-,33-,35-,36+,37+,39+/m0/s1
    Key: PPFISAQUKQQDHW-OBEWLBDZSA-N
  • C[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](O1)OC(C)C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C=C/C(=O)N[C@@H](CCCN)C(=O)O
Properties
C39H52N2O8
Molar mass 676.851 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Granadaene is the trivial name of a non-isoprenoid polyene that constitutes the red pigment characteristic of Streptococcus agalactiae (group B streptococcus).

Contents

Characteristics

Granadaene contains a conjugated system made up of a linear chain of 12 conjugated double bonds which is connected to the amino acid ornithine at one end and the sugar rhamnose at the other. [1] [2]

Granadaene is dark red, odorless, insoluble in water, methanol, ethanol, diethyl ether, acetone, hexane, dimethyl sulfoxide (DMSO), acetonitrile, tetrahydrofuran, chloroform, and in most solvents, it is soluble in DMSO–0.1% trifluoroacetic acid (TFA). [1] Granadaene, can be extracted from cultures of S.agalactiae in granada broth (granada medium without agar) with 0.1 M potassium hydroxide (KOH) and purified by size-exclusion chromatography on Sephadex LH using DMSO–0.1%TFA. [1]

Streptococcus agalactiae in granada broth Streptococcus agalactiae in granada broth.JPG
Streptococcus agalactiae in granada broth
Streptococcus agalactiae on granada agar, anaerobic incubation Streptococcus agalactiae on Granada medium.jpg
Streptococcus agalactiae on granada agar, anaerobic incubation
Ultraviolet/visible spectrum of granadaene, in DMSO+TFA Granadaene UV-VIS spectrum DMSO-TFA.jpg
Ultraviolet/visible spectrum of granadaene, in DMSO+TFA
Proposed metabolic pathway for granadaene biosynthesis Granadaene pathway.jpg
Proposed metabolic pathway for granadaene biosynthesis

The ultraviolet-visible absorption spectrum of the granadaene (in DMSO/TFA) is almost identical to that of a carotene with a similar conjugated system of 12 double bonds (e.g. alpha-carotene), that is why the GBS pigment was considered to be a carotene for many years. [3]

Granadaene and S.agalactiae detection and identification

Production of the red pigment granadaene is a phenotypic trait specific to β-hemolytic GBS, and because of that, detection of red colonies from clinical samples, when cultivated on granada medium, allows the straightforward identification of GBS. [4] [5] [6]

Biological relevance

Granadaene is an organic compound produced by S.agalactiae. It is the product of a metabolic pathway similar to that of biosynthesis of fatty acids. The enzymes necessary for the biosynthesis of granadaene in GBS are coded by a gene cluster of 12 genes, the cyl operon, and a pathway for the pigment biosynthesis requiring all the genes of the cyl operon has been proposed. [7] [8]

Like the biosynthesis of the pigment, the hemolytic activity requires also in GBS the 12 genes of the cyl operon. [9] [10]

The pigment is localized, in GBS, in the cell membrane, [3] where it could play a role in membrane stabilization, similarly to the role of carotenes in other bacterial membranes. [11]

In addition to S.agalactiae the presence of granadaene and the cyl genes has been reported in pigmented Acidipropionibacterium spp. (former Propionibacterium) as A.jensenii, A.thoenii and A.virtanenii , where it can cause defects such as red spots in some cheeses. [12]

Probably granadaene is also present in other related species such as Pseudopropionibacterium rubrum. [8] [12] [13]

Granadaene is also produced by strains of Lactocococcus garvieae/petaury/formosensis group where the cyl cluster is also present. [14]

The cyl genes has been cloned in Lactococcus lactis (a non-hemolytic non-pigmented Gram-positive bacterium) and the expression of the GBS cyl operon conferred hemolysis, pigmentation, and cytoxicity to Lactococcus lactis. Proving that the expression of the genes of the cyl operon is sufficient for Granadaene production in a heterologous host. [15]

Granadaene and GBS Virulence

The hemolytic activity of granadene is strongly linked to the length of its polyene chain. [16] [17]

It has been proposed that granadaene is indeed the hemolysin of S.agalactiae, the GBS hemolysin is a broad-spectrum cytolysin able to destroy many eukaryotic cells, including platelets. Because of this, granadaene is considered an important virulence factor for GBS. [7] [8] [18] [19] [20] [21] [22] [23]

Related Research Articles

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Streptococcus is a genus of gram-positive coccus or spherical bacteria that belongs to the family Streptococcaceae, within the order Lactobacillales, in the phylum Bacillota. Cell division in streptococci occurs along a single axis, so as they grow, they tend to form pairs or chains that may appear bent or twisted. This differs from staphylococci, which divide along multiple axes, thereby generating irregular, grape-like clusters of cells. Most streptococci are oxidase-negative and catalase-negative, and many are facultative anaerobes.

<span class="mw-page-title-main">Group A streptococcal infection</span> Medical condition

Group A streptococcal infections are a number of infections with Streptococcus pyogenes, a group A streptococcus (GAS). S. pyogenes is a species of beta-hemolytic Gram-positive bacteria that is responsible for a wide range of infections that are mostly common and fairly mild. If the bacteria enter the bloodstream an infection can become severe and life-threatening, and is called an invasive GAS (iGAS).

<i>Streptococcus pyogenes</i> Species of bacterium

Streptococcus pyogenes is a species of Gram-positive, aerotolerant bacteria in the genus Streptococcus. These bacteria are extracellular, and made up of non-motile and non-sporing cocci that tend to link in chains. They are clinically important for humans, as they are an infrequent, but usually pathogenic, part of the skin microbiota that can cause Group A streptococcal infection. S. pyogenes is the predominant species harboring the Lancefield group A antigen, and is often called group A Streptococcus (GAS). However, both Streptococcus dysgalactiae and the Streptococcus anginosus group can possess group A antigen as well. Group A streptococci, when grown on blood agar, typically produce small (2–3 mm) zones of beta-hemolysis, a complete destruction of red blood cells. The name group A (beta-hemolytic) Streptococcus (GABHS) is thus also used.

<span class="mw-page-title-main">Streptococcal pharyngitis</span> Medical condition

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<i>Streptococcus agalactiae</i> Species of bacterium

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<i>Arcanobacterium haemolyticum</i> Species of bacterium

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<i>Streptococcus dysgalactiae</i> Species of bacterium

Streptococcus dysgalactiae is a gram positive, beta-haemolytic, coccal bacterium belonging to the family Streptococcaceae. It is capable of infecting both humans and animals, but is most frequently encountered as a commensal of the alimentary tract, genital tract, or less commonly, as a part of the skin flora. The clinical manifestations in human disease range from superficial skin-infections and tonsillitis, to severe necrotising fasciitis and bacteraemia. The incidence of invasive disease has been reported to be rising. Several different animal species are susceptible to infection by S. dysgalactiae, but bovine mastitis and infectious arthritis in lambs have been most frequently reported.

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Streptococcal intertrigo is a skin condition that is secondary to a streptococcal bacterial infection. It is often seen in infants and young children and can be characterized by a fiery-red color of the skin, foul odor with an absence of satellite lesions, and skin softening in the neck, armpits or folds of the groin. Newborn children and infants commonly develop intertrigo because of physical features such as deep skin folds, short neck, and flexed posture. Prompt diagnosis by a medical professional and treatment with topical and/or oral antibiotics can effectively relieve symptoms.

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<span class="mw-page-title-main">Lancefield grouping</span>

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<span class="mw-page-title-main">Granada medium</span>

Granada medium is a selective and differential culture medium designed to selectively isolate Streptococcus agalactiae and differentiate it from other microorganisms. Granada Medium was developed by Manuel Rosa-Fraile et al. at the Service of Microbiology in the Hospital Virgen de las Nieves in Granada (Spain).

References

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