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1996-02-26
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Document 0825
DOCN M9620825
TI Multi-gene family of major surface glycoproteins of Pneumocystis
carinii: full-size cDNA cloning and expression.
DT 9602
AU Kitada K; Wada M; Nakamura Y; Department of Tumor Biology, University of
Tokyo, Japan.
SO DNA Res. 1994;1(2):57-66. Unique Identifier : AIDSLINE GENBANK/D17440
AB The major surface glycoprotein (MSG) of Pneumocystis carinii plays a
crucial role in the fatal pneumonia caused by this organism in AIDS
patients. A cDNA encoding a full-length MSG polypeptide was isolated
from a lambda library of rat-derived P. carinii cDNAs. The deduced MSG,
referred to as the MSG5 subtype, is a 120,765-Da protein composed of
1,076 amino acids and contains an anchoring hydrophobic sequence at the
C-terminus of the protein. Sequence analyses of cloned MSG-cDNAs
revealed an MSG-gene family with approximately 70% protein sequence
identity between subtypes. P. carinii karyotype hybridization analyses
indicated that the MSG gene family members are scattered throughout most
of the P. carinii chromosomes. These recombinant MSG proteins reacted
with the antiserum from P. carinii-infected rats, as expected, and
antiserum generated against P. carinii-infected mice, indicating the
existence of common determinants in MSG polypeptides. The family of MSG
proteins is rich in cysteine residues and these cysteines are highly
conserved in all MSG subtypes regardless of species specificity,
suggesting the structural and/or functional importance of these
cysteines. The pathobiological significance of the MSG gene family and
its sequence diversity in P. carinii is discussed.
DE Amino Acid Sequence Animal Antibodies, Fungal/IMMUNOLOGY Antigens,
Fungal/*GENETICS Base Sequence Cloning, Molecular Comparative Study
DNA Primers/CHEMISTRY DNA, Complementary/GENETICS Ferrets/MICROBIOLOGY
Fungal Proteins/*GENETICS Gene Expression Regulation, Fungal Genes,
Reiterated Membrane Glycoproteins/*GENETICS Mice Molecular Sequence
Data Pneumocystis carinii/*GENETICS Rats Recombinant
Proteins/IMMUNOLOGY Sequence Alignment Sequence Homology, Amino Acid
Sequence Homology, Nucleic Acid Support, Non-U.S. Gov't JOURNAL
ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).