Novel mycolic acid-containing bacteria in the family Segniliparaceae fam. nov., including the genus Segniliparus gen. nov., with descriptions of Segniliparus rotundus sp. nov. and Segniliparus rugosus sp. nov.
Four strains of novel, rapidly growing, acid-alcohol-fast-staining bacteria were characterized with a polyphasic approach. Isolates were received by the Centers for Disease Control and Prevention from domestic health department laboratories for reference testing as unidentifiable, clinical mycobacteria. Bacteria were rod-shaped and produced non-pigmented (white to beige), non-photochromogenic, smooth or wrinkled-rough colonies on Middlebrook 7H10 and 7H11 media at 33 degrees C. The smooth and wrinkled colony forms were representative of two species with 68.0 and 72.0 mol% DNA G+C content. The cell wall contained meso-diaminopimelic acid and mycolic acids. Species were characterized by cellular fatty acids of C10:0, C14:0, C16:1omega9t, C16:0, C18:1omega9c and 10-methyl C18:0 (tuberculostearic acid). HPLC analysis of mycolic acids produced a novel late-emerging, genus-specific mycolate pattern. TLC analysis demonstrated a novel alpha(+)-mycolate. Species were 98.9% similar by comparison of 16S rRNA gene sequences; however, the DNA-DNA association was <28 %. Phylogenetic analysis of 16S rRNA gene sequences demonstrated an association with Rhodococcus equi, although a DNA-DNA relatedness value of 2% did not support a close relationship. PCR analysis of a proposed, selected actinomycete-specific 439 bp fragment of the 65 kDa heat-shock protein was negative for three of the four isolates. The creation of Segniliparaceae fam. nov. is proposed to encompass the genus Segniliparus gen. nov., including two novel species, the type species Segniliparus rotundus sp. nov. and Segniliparus rugosus sp. nov., with the respective type strains CDC 1076(T) (=ATCC BAA-972(T)=CIP 108378(T)) and CDC 945(T) (=ATCC BAA-974(T)=CIP 108380(T)).
Butler
W Ray
WR
Division of Tuberculosis Elimination, National Center for HIV, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Floyd
Margaret M
MM
Division of Tuberculosis Elimination, National Center for HIV, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Brown
June M
JM
Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Toney
Sean R
SR
Division of Tuberculosis Elimination, National Center for HIV, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Daneshvar
Maryam I
MI
Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Cooksey
Robert C
RC
Division of Tuberculosis Elimination, National Center for HIV, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Carr
Janice
J
Division of Healthcare Quality Promotion, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Steigerwalt
Arnold G
AG
Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
Charles
Nadege
N
Division of Tuberculosis Elimination, National Center for HIV, STD and Tuberculosis Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.
D000192:Actinomycetales / Q000737:chemistry* / Q000145:classification* / Q000235:genetics / Q000502:physiology; D000193:Actinomycetales Infections / Q000382:microbiology; D015373:Bacterial Typing Techniques; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D020459:Genes, rRNA; D006801:Humans; D008969:Molecular Sequence Data; D009171:Mycolic Acids / Q000032:analysis*; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S; D017422:Sequence Analysis, DNA; D013045:Species Specificity
D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D009171:Mycolic Acids; D012336:RNA, Ribosomal, 16S