A Nest of LTR Retrotransposons Adjacent the Disease Resistance-Priming Gene NPR1 in Beta vulgaris L. U.S. Hybrid H20

Table 1

Several LTR retrotransposons discovered within a TE nest, in addition to Coe1 [7], by LTR_STRUC analysis of a sugarbeet genomic BAC carrying NPR1.

Feature	SCHULTE	SCHMIDT	Older LTR-RTR	Coe1 [7]
Active site	YVDDIIL	FIDDILI	SCDDVLL	YVDDIIL
Length of RTR	10 833 bp	11 565 bp	5395 bp (before two TE insertions)	14 531 bp
Length of LTR	1372 bp	2561 bp	780 bp	169 bp
$5^{\prime }$ LTR-$3^{\prime }$ LTR Identity (%)	99.3%	100.0%	99.0%	96.4%
Number of open reading frames (ORFs)	2	1	2	3
$5^{\prime }$ beginning and $3^{\prime }$ end of flanking region (duplication)	ATTTT	CGCTC	GCTTG	CTACT
Class & domains present	Copia-like Integrase and RTase domains	All domains expected of a complete Gypsy-like retrotransposon	Putative RT domains	Coe1 [7], class II within a class I, DNA transposase/Copia-like RTase pseudogene