title: Cloning, sequencing and variability analysis of the gap gene from Mycoplasma hominis.
abstract: The gap gene encodes the glycolytic enzyme glyceraldehyde 3-phosphate dehydrogenase (GAPDH). The gene was cloned and sequenced from the Mycoplasma hominis type strain PG21(T). The intraspecies variability was investigated by inspection of restriction fragment length polymorphism (RFLP) patterns after polymerase chain reaction (PCR) amplification of the gap gene from 15 strains and furthermore by sequencing of part of the gene in eight strains. The M. hominis gap gene was found to vary more than the Escherichia coli counterpart, but the variation at nucleotide level gave rise to only a few amino acid substitutions. To verify that the gene was expressed in M. hominis, a polyclonal antibody was produced and tested against whole cell protein from 15 strains. The enzyme was expressed in all strains investigated as a 36-kDa protein. All strains except type strain PG21(T) showed reaction to a 104-kDa band in addition to the expected 36-kDa band. The protein reacting at 104 kDa is a M. hominis protein with either an epitope similar to one on GAPDH, or it is an immunoglobulin binding protein.
authors.affiliation: Department of Medical Microbiology and Immunology, The Bartholin Building, University of Aarhus, DK-8000, Aarhus C, Denmark.
authors.forename: T
authors.initials: T
authors.lastname: Mygind
authors.forename: I
authors.initials: I
authors.lastname: Zeuthen Søgaard
authors.forename: R
authors.initials: R
authors.lastname: Melkova
authors.forename: T
authors.initials: T
authors.lastname: Boesen
authors.forename: S
authors.initials: S
authors.lastname: Birkelund
authors.forename: G
authors.initials: G
authors.lastname: Christiansen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D014644:Genetic Variation; D005987:Glyceraldehyde-3-Phosphate Dehydrogenases / Q000737:chemistry / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D009175:Mycoplasma Infections / Q000382:microbiology; D019535:Mycoplasma hominis / Q000201:enzymology* / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D011817:Rabbits; D017422:Sequence Analysis, DNA
chemical_list: D005987:Glyceraldehyde-3-Phosphate Dehydrogenases