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Document 0880
DOCN M9480880
TI Conserved sequence homology of cysteine rich regions in genes encoding
glycoprotein A in Pneumocystis carinii derived from different host
species.
DT 9410
AU Wright T; Haidaris P; Gigliotti F; Harmsen A; Haidaris C; University of
Rochester, NY.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:141 (abstract no. D-253).
Unique Identifier : AIDSLINE ASM94/94313065
AB Pneumocystis carinii (Pc) surface glycoprotein A (gpA) exhibits
host-species specific phenotypic and genotypic variation. Despite this
heterogeneity, the gpAs of Pc isolated from different host species
appear to be homologous molecules sharing certain biochemical and
antigenic characteristics. Using two degenerate oligodeoxyribonucleotide
primers corresponding to conserved Cys regions from ferret and rat Pc
gpA, a polymerase chain reaction (PCR) product of approximately 300 bp
was amplified from ferret, rat, and SCID mouse Pc-infected lung genomic
DNA. Northern hybridization revealed a transcript of 3450 nucleotides in
Pc-infected SCID mouse lung mRNA, which is similar in size to the
transcripts for ferret and rat Pc gpA. Nucleotide sequence analysis of
SCID mouse P. carinii gpA subclones derived from the PCR products
identified two isoforms, which were 89% identical to each other in the
amplified region, and 73% and 54% identical to the rat and ferret
derived Pc gpA genes, respectively. Comparison of the deduced amino acid
sequences of mouse, ferret and rat Pc gpAs revealed striking similarity
in residues adjacent to and including the conserved Cys. Furthermore,
the spacing of two Pro residues is invariant, and a potential N-linked
glycosylation site is found at a similar position in all of the gpAs.
Despite the heterogeneity observed in Pc gpA, the conservation of Cys
residues and adjacent sequences implies similar secondary structure and,
therefore, function for the gpAs of Pc isolated from different host
species.
DE Animal Base Sequence Blotting, Northern Comparative Study *Conserved
Sequence Cysteine Ferrets Fungal Proteins/BIOSYNTHESIS/*GENETICS
*Genes, Fungal Lung/MICROBIOLOGY Membrane
Glycoproteins/BIOSYNTHESIS/*GENETICS Mice Mice, SCID Pneumocystis
carinii/*GENETICS/ISOLATION & PURIF Polymerase Chain Reaction/METHODS
Proline Rats RNA, Messenger/BIOSYNTHESIS MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).