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Fatty acid and phospholipid composition ofBacillus megaterium spores with altered germination properties

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Lipids

Abstract

The ability of spores to trigger germination was altered by growing spores at either a suboptimal temperature or in a rich medium modified by substituting L-isoleucine for D-glucose. Compared to the control, spores grown in the presence of isoleucine germinated more readily between 20 and 28 C, while spores grown at 20 C germinated slower than the control at any temperature tested. Analysis of the composition of these spores indicated that spores grown in the presence of isoleucine had much higher levels of anteiso-C15 fatty acids than the control, while the phospholipid composition and the phospholipid to protein ratio were unchanged. The fatty acid composition for spores grown at 20 C was comparable to that of the control spores, but the levels of diphosphatidylglycerol and phosphatidylglycerol were altered as well as the ratio of phospholipid to protein. Steady-state fluorescent anisotropy measurements were made with 1,6-diphenyl-1,3,5-hexatriene incorporated into membrane isolated from these spores. The membranes from spores grown in the presence of isoleucine were more “fluid” between 10 and 20 C than membranes from the control spores. Membranes from 20 C grown spores were less “fluid” between 10 and 38 C than membranes from the control spores. These results show that triggering of spore germination was altered by growing spores under conditions that altered the composition of spore membranes.

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Abbreviations

DPH:

1,6-diphenyl-1,3,5-hexatriene

HEPES:

N-2-hydroxyethylpiperazine-N′-2′-ethane sulfonic acid

Tris:

tris (hydroxymethyl) amino methane

n-C14:

tetradecanoic acid

i-C14:

12-methyltridecanoic acid

n-C15:

pentadecanoic acid

i-C15:

13-methyltetradecanoic acid

a-C15:

12-methyltetradecanoic acid

n-C16:

hexadecanoic acid

i-C16:

14-methylpentadecanoic acid

i-C17:

15-methylhexadecanoic acid

a-C17:

14-methylhexadecanoic acid

t1/2:

time required during germination for 50% change of the total adsorbance at 660 nm in 30 min

SNB:

supplemented nutrient broth medium

SNI:

supplemented broth medium with isoleucine

DPG:

diphosphatidylglycerol

PG:

phosphatidylglycerol

PE:

phosphatidylethanolamine

and Glc-NH2-PG:

glucosaminyl-phosphatidylglycerol

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Authors and Affiliations

  1. Department of Biochemistry, University of Illinois Medical Center, 60612, Chicago, IL

    J. F. Skomurski & J. C. Vary

Authors
  1. J. F. Skomurski
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  2. J. C. Vary
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Skomurski, J.F., Vary, J.C. Fatty acid and phospholipid composition ofBacillus megaterium spores with altered germination properties. Lipids 17, 914–923 (1982). https://doi.org/10.1007/BF02534587

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  • DOI: https://doi.org/10.1007/BF02534587

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