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. 2009 Dec 22;78(3):1163–1175. doi: 10.1128/IAI.00997-09

TABLE 5.

Observed and calculated ions, (M-H)⁻, for the lipid A of Y. pestis KIM5^a

Observed ion (m/z)	Calculated ion (m/z)	Proposed composition^c
1324.9	1,324.7	P₁GlcN₂βOHC_14:0(4)
1405.1	1,404.7	P₂GlcN₂βOHC_14:0(4)
1456.2	1,455.9	P₁AraN₁GlcN₂βOHC_14:0(4)
1536.3 (1,558.3)^b	1,535.8	P₂AraN₁GlcN₂βOHC_14:0(4) (Na)
1667.5 (1,669.6)^b	1,667.0	P₂AraN₂GlcN₂βOHC_14:0(4) (Na)
1718.8	1,718.1	P₂AraN₁GlcN₂βOHC_14:0(4)C_12:0(1)
1743.9	1,743.4	P₁GlcN₂βOHC_14:0(4)C_12:0(1)C_16:1(1)
1824.0	1,823.4	P₂GlcN₂βOHC_14:0(4)C_12:0(1)C_16:1(1)
1850.0	1,849.3	P₂AraN₂GlcN₂βOHC_14:0(4)C_12:0(1)
1876.3	1,874.6	P₁AraN₁GlcN₂βOHC_14:0(4)C_12:0(1)C_16:1(1)
1955.5	1,954.3	P₂AraN₁GlcN₂βOHC_14:0(4)C_12:0(1)C_16:1(1)
2086.6 (2,109.6)^b	2,085.7	P₂AraN₂GlcN₂βOHC_14:0(4)C_12:0(1)C_16:1(1) (Na)

^a

The lipid A from the pgmA mutant of Y. pestis KIM5 gave the same ions. The most intense ions are indicated in bold.

^b

Occasionally the sodiated form of the lipid A was observed for some ions (shown in parentheses).

^c

Subscript numbers in parentheses indicate the number of carbon chains with the indicated composition.