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Haemophilus influenzae is a Gram negative and specific human pathogen that causes acute bacterial meningitis , septicemia , epiglotitis , bacterimia , otitis media . the goal of this study is one of the conserved proteins in this bacterium and designing of a domestic vaccine against it. ProteinP2 (38-40 KDa ) comprises more than 50 percent of all the proteins in outer membrane of Haemophilus and is expressesed by non-capsulated strains of H.influenzae type b.
This protein is indictaed as a proper candidate for vaccine to non-capsulated Haemophilus influenzae .in this study , epidemiology of ompP2 gene was surveyed using clinical samples isolated from 30 patients . the bacteria were cultured in chocolate agar mediaand Biochemical tests performed for them. After DNA purification , PCR method was performed for samples . all the samples were positive for ompP2 gene . after sequencing of 6 samples and comparison of ompP2 gene in all samples with domestic strains that exist in Gene Bank , similarities and differences due to nucleotide deletion , addition or translocation were defined by MEGA 4 software.
PCR products were digested by Alu1 and EcoR1 for defining of polymorphism patterns in given gene. Cutting patterns in 21 samples (98%-99%) were similar to domestic samples and 9 (91%-98%) of them were distinct. our results are indicated that ompP2 gene organization is similar to distinct strains of Haemophilus ifluenzae recorded in Gene Bank (accessionno: J3359.1, M93268.1, M93269.1, M93270.1) and polymorphism has occurred in cutting region by Alu1 enzyme. Thus this protein can be considered as a potential vaccine of Haemophilus in future studies.

Key word: Haemophilus influenzae, vaccine, ompP2 gene

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Haemophilus influenzae outer membrane protein P2(ompP2) gene, complete cds
GenBank: M93269.1

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* Features
* Sequence
LOCUS HEAOMPPB 1137 bp DNA linear BCT 26-APR-1993
DEFINITION Haemophilus influenzae outer membrane protein P2 (OMPP2) gene,
complete cds.
VERSION M93269.1 GI:148964
KEYWORDS OMPP2 gene; outer membrane protein P2.
SOURCE Haemophilus influenzae 2019
ORGANISM Haemophilus influenzae 2019
Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
Pasteurellaceae; Haemophilus.
REFERENCE 1 (bases 1 to 1137)
AUTHORS Sikkema,D.J. and Murphy,T.F.
TITLE Molecular analysis of the P2 porin protein of nontypeable
Haemophilus influenzae
JOURNAL Infect. Immun. 60 (12), 5204-5211 (1992)
PUBMED 1280627
FEATURES Location/Qualifiers
source 1..1137
/organism=”Haemophilus influenzae 2019″
/mol_type=”genomic DNA”
gene 1..1137
CDS 1..1137
/product=”outer membrane protein”
sig_peptide 1..60
mat_peptide 61..1134
/product=”outer membrane protein P2″
1 atgaaaaaaa cacttgcagc attaatcgtt gttgcattcg cagcttcagc agcaaacgca
61 gctgttgttt ataacaacga agggactaac gtagaattag gtggtcgttt aagcattatc
121 gcagaacaaa gtaatagcac tataaaggat caaaaacagc aacacggtgc attacgcaat
181 caaagttcac gtttccacat taaagcaacg cataacttcg gtgatggttt ctatgcacaa
241 ggttatttag aaactcgttt agtttcagct caatctggaa ccgagtcaga taacttcggt
301 catattataa ccaaatatgc ttatgtcact ttaggaaatt tcgcaaaggg tgaagtaaaa
361 cttggtcgtg cgaaaactat tgctgatggc ataataagcg cagaagataa agaatatggt
421 gttctcaaca atagcaaata tattcctact aatggtaata ccgttggcta cacttttaaa
481 ggtatcgatg gtttagtatt aggtgctaat tatttattag cacaacagcg tcataagtat
541 actgctgctg ctgctgctgc tgctgctgct ggtggtgctc gtgctgttgc aggagaagtt
601 tatccacaaa aaatcagcaa tggcgttcag gttggtgcaa aatatgatgc aaacaacatt
661 attgcaggta ttgcttatgg tcgtacaaat tatagagaag

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