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Chapter 28 : Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids

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Abstract:

The compositional and architectural complexity of the mycobacterial cell envelope is probably the most distinctive feature of the genus. It is the basis of many of the physiological and pathogenic features of these bacteria and the site of susceptibility and resistance to many antimycobacterial drugs ( ). In the context of the increasing incidence of multidrug-resistant strains of , elucidating the complex pathways allowing mycobacteria to synthesize and assemble this complex structure represents a crucial area of research.

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013

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Figures

Image of Figure 1
Figure 1

Schematic representation of the cell envelope. Many of the classes of lipids and glycolipids discussed in the text are represented schematically and are shown in probable locations in the cell envelope. The structures with light and dark green hexagons represent trehalose mono- and dimycolates, respectively; the red lollipops represent phthiocerol dimycocerosates, and the gold ones represent sulfolipids, diacyltrehaloses, and polyacyltrehaloses. Gray circles represent phospholipid headgroups; black circles, isoprenoids; light blue squares, GlcNAc; white squares, MurNAc; white pentagons, arabinofuranose; yellow diamonds, galactofuranose; and blue hexagons, mannose. The overall schematic and individual structures are not drawn to scale, and the numbers of carbohydrate residues shown are not representative of the actual molecules. Proteins and peptides are not shown for the sake of clarity. doi:10.1128/microbiolspec.MGM2-0021-2013.f1

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 2

Structures of mycobacterial phospholipids. doi:10.1128/microbiolspec.MGM2-0021-2013.f2

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 3

Structures of IPP and DMAPP. These molecules are precursors of all isoprenoid compounds. doi:10.1128/microbiolspec.MGM2-0021-2013.f3

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 4

Structures of representative short-chain IPPs synthesized by mycobacteria. The sterochemical conformation is shown. doi:10.1128/microbiolspec.MGM2-0021-2013.f4

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 5

Structures of isoprenylphosphates reported from . doi:10.1128/microbiolspec.MGM2-0021-2013.f5

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 6

Structures of the predominant menaquinone and menaquinone sulfate reported from . Carbon positions 2 and 3 and the β-isoprene unit are indicated by the arrows and call-out. doi:10.1128/microbiolspec.MGM2-0021-2013.f6

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 7

Structures of representative carotenoids found in mycobacteria. doi:10.1128/microbiolspec.MGM2-0021-2013.f7

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 8

Structures of representative noncarotenoid cyclic isoprenoids found in mycobacteria. doi:10.1128/microbiolspec.MGM2-0021-2013.f8

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 9

Structures of TMM and TDM. doi:10.1128/microbiolspec.MGM2-0021-2013.f9

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 10

Structures of SLs, DATs, and PATs and biosynthetic gene clusters. The major sulfolipid, SL-I (2,3,6,6′-tetraacyl α-α′-trehalose-2′-sulfate), is represented. In SL-I, trehalose is sulfated at the 2′ position and esterified with palmitic acid and the multimethyl-branched phthioceranic and hydroxyphthioceranic acids. In DAT (2,3-di--acyltrehalose), trehalose is esterified with palmitic acid and the multimethyl-branched mycosanoic acid. In PAT, trehalose is esterified with palmitic acid and the multimethyl-branched mycolipenic acids. doi:10.1128/microbiolspec.MGM2-0021-2013.f10

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 11

Structures of (A) major LOS (LOS-A) of ATCC 356 (R and/or R : octanoic acid and tetra- or hexa-decanoic acid) and (B) “canettii”; R = Ac. (C) LOS biosynthetic gene cluster of mc155. Shown is the 25.15-kb region spanning () to (). ORFs are depicted as arrows. Black arrows indicate genes encoding biosynthetic enzymes; gray arrows indicate putative transporter genes; white arrows show hypothetical genes of unknown function. Abbreviations: Pks5, Mas-like polyketide synthase; Pap, putative acyltransferase; MSMEG_4729 and MSMEG_4730, putative acyltransferases; FadD, putative acyl-CoA synthase; Gtf (MSMEG_4732), putative glycosyltransferase; Gap2, putative transmembrane protein involved in glycolipid translocation; MSMEG_4734, hypothetical PE/PPE-like protein; Gtf (MSMEG_4735), putative glycosyltransferase; MSMEG_4736 and MSMEG_4737, putative pyrruvylyl transferases; MSMEG_4738, hypothetical protein; Mtf, possible -methyltransferase; Gtf (MSMEG_4740), putative glycosyltransferase; MmpL, putative inner membrane transporter. doi:10.1128/microbiolspec.MGM2-0021-2013.f11

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 12

Structure of the predominant mannosyl-β-1-phosphomycoketide from H37Rv. See text for details. doi:10.1128/microbiolspec.MGM2-0021-2013.f12

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 13

Structures of the PDIMs, PGLs, and -hydroxybenzoic acid derivatives (-HBADs) of . In , p, p′ = 3-5; n, n′ = 16-18; m2 = 15-17 ; m1 = 20-22; R = CH-CH or CH. doi:10.1128/microbiolspec.MGM2-0021-2013.f13

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Image of Figure 14
Figure 14

Genetic organization of the PDIM and PGL locus of H37Rv. ORFs are depicted as arrows. Black arrows indicate genes encoding biosynthetic enzymes; gray arrows indicate putative transporter genes; white arrows indicate hypothetical genes of unknown function. More details about the function of each gene are provided in Table 3 and Fig. 15 . Adapted from reference . doi:10.1128/microbiolspec.MGM2-0021-2013.f14

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 15

The PDIM biosynthetic pathway. See text for details. doi:10.1128/microbiolspec.MGM2-0021-2013.f15

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Image of Figure 16
Figure 16

(A) Structure of the nonspecific glycopeptidolipids of . R = –H or –CH; R = –H or –Ac; R, –CH, -succinyl, -rhamnosyl or -2--succinylrhamnosyl; m = 12-14; n, 6-10. (B) GPL biosynthetic gene cluster of mc155. Shown is the 64.97-kb region spanning () to . ORFs are depicted as arrows. Black arrows indicate genes encoding biosynthetic enzymes; gray arrows indicate putative transporter genes; white arrows indicate putative regulatory genes. Chp, putative acyltransferase; FadE, putative acyl-CoA dehydrogenase; PapA, putative acyltransferase. Other genes are described in the text. doi:10.1128/microbiolspec.MGM2-0021-2013.f16

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 17

Structure and biosynthesis of α--glucans in . See text for details. doi:10.1128/microbiolspec.MGM2-0021-2013.f17

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Image of Figure 18
Figure 18

Representative structures of mycobactins and carboxymycobactins from . See text for details. Mycobactins: R = H; R = (CH)CH, n = 16-19; (CH)CH = CH(CH)CH, x+y = 14-17. Carboxymycobactins: R = H, CH; R = (CH)COOCH/COOH, n = 1-7; (CH)CH = CH(CH)COOCH/COOH, x+y = 1-5. doi:10.1128/microbiolspec.MGM2-0021-2013.f18

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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Figure 19

Representative structure of a mycolactone from . The genes involved in the biosynthesis of the various constituents of mycolactone are indicated on the structure. doi:10.1128/microbiolspec.MGM2-0021-2013.f19

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
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References

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Tables

Generic image for table
Table 1

H37Rv genes involved or thought to be involved in the biogenesis of phospholipids, triglycerides, isoprenoids, and related lipids

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
Generic image for table
Table 2

H37Rv genes involved in the biogenesis of trehalose mono- and dimycolates, sulfolipids, di- and poly-acyltrehaloses, and mannosyl-β-1-phosphomycoketides

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
Generic image for table
Table 3

H37Rv genes involved in the biogenesis of phthiocerol dimycocerosates, phenolic glycolipids, and -hydroxybenzoic acids

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013
Generic image for table
Table 4

H37Rv genes involved in the biogenesis of capsular α-D-glucan

Citation: Daffé M, Crick D, Jackson M. 2014. Genetics of Capsular Polysaccharides and Cell Envelope (Glyco)lipids, p 559-609. In Hatfull G, Jacobs W (ed), Molecular Genetics of Mycobacteria, Second Edition. ASM Press, Washington, DC. doi: 10.1128/microbiolspec.MGM2-0021-2013

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