Chimeras
- As a general rule, Hops for which a contiguous stretch >
40% of the coding region is unique or derived from an unrelated
Hop should be considered chimeras. All chimeras thus far identified
are composed of a region similar to a previously named Hop and
a novel coding sequence. These have been assigned a unique alphabetic
designation. If Hops are identified that appear to be chimeras
composed of two previously characterized Hops, it is recommended
that they be named using the alphabetic characters of both parents
(e.g. a chimera Hop composed of regions from HopABpv
strain and HopXYpv strain would
be named HopAB-XYpv strain).
Pseudogenes
- Non-expressed homologs of characterized Hop families can be
named according to the convention for bacterial pseudogenes
wherein the gene name is preceded by the Greek letter "psi"
(e.g. yhopXY1pv
strain).
Non-secreted/translocated
Hop alleles
- Homologs that are expressed but neither secreted nor translocated,
can be named after the Hop family and subgroup to which they
are homologous followed by an asterisk (e.g. HopXY1 * pv
strain). Experimental confirmation of this phenotype
is strongly encouraged, as not all Hops have an obvious N-terminal
secretion/translocation domain.
Gene
disruptions
- Homologs of previously characterized hop genes that are truncated
by a frameshift or premature stop codon can be indicated by
addition of a single quotation mark to the hop gene name (i.e.
hopXY'pv strain). If a disrupted
gene fails to be expressed, a "psi" (y)
can also be added to reflect pseudogene status. Insertions by
mobile genetic elements can be indicated with a double colon
followed by the name of the inserted element (i.e. hopXY::IS10pv
strain).
Hop
chaperones
- Three Hop chaperones have been experimentally confirmed and
named with the designation Shc (specific Hop chaperone) followed
by the letter of the first Hop for which they were shown to
be a chaperone. This designation was chosen to parallel the
Yersinia spp. term Syc (specific Yersinia chaperone). Acceptable
evidence for chaperone activity includes any method that directly
demonstrates association of the chaperone and its cognate Hop,
such as affinity chromatography, immunoblotting, yeast two-hybrid
experiments, or crystal structure. In addition, a decrease in
Hrp-dependent secretion of the chaperoned protein should be
evident upon mutagenesis of the chaperone gene.