Mutations in Flavobacterium johnsoniae gldF and gldG disrupt gliding motility and interfere with membrane localization of GldA

被引:60
作者
Hunnicutt, DW [1 ]
Kempf, MJ [1 ]
McBride, MJ [1 ]
机构
[1] Univ Wisconsin, Dept Biol Sci, Milwaukee, WI 53201 USA
关键词
D O I
10.1128/JB.184.9.2370-2378.2002
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Flavobacterium johnsoniae moves rapidly over surfaces by a process known as gliding motility. The mechanism of this form of motility is not known. Four genes that are required for F.johnsoniae gliding motility, gldA, gldB, gldD, and ftsX, have recently been described. GldA is similar to the ATP-hydrolyzing components of ATP binding cassette (ABC) transporters. Tn4351 mutagenesis was used to identify two additional genes, gldF and gldG, that are required for cell movement. gldF and gldG appear to constitute an operon, and a Tn4351 insertion in gldF was polar on gldG. pMK314, which carries the entire gldFG region, restored motility to each of the gldF and gldG mutants. pMK321, which expresses GldG but not GldF, restored motility to each of the gldG mutants but did not complement the gldF mutant. GldF has six putative membrane-spanning segments and is similar in sequence to channel-forming components of ABC transporters. GldG is similar to putative accessory proteins of ABC transporters. It has two apparent membrane-spanning helices, one near the amino terminus and one near the carboxy terminus, and a large intervening loop that is predicted to reside in the periplasm. GldF and GldG are involved in membrane localization of GldA, suggesting that GldA, GldF, and GldG may interact to form a transporter. F. johnsoniae gldA is not closely linked to gldFG, but the gldA, gldF, and gldG homologs of the distantly related gliding bacterium Cytophaga hutchinsonii are arranged in what appears to be an operon. The exact roles of F. johnsoniae GldA, GldF, and GldG in gliding are not known. Sequence similarities of GldA to components of other ABC transporters suggest that the Gld transporter may be involved in export of some material to the periplasm, outer membrane, or beyond.
引用
收藏
页码:2370 / 2378
页数:9
相关论文
共 61 条
[1]   SULFONOLIPIDS ARE MOLECULAR DETERMINANTS OF GLIDING MOTILITY [J].
ABBANAT, DR ;
LEADBETTER, ER ;
GODCHAUX, W ;
ESCHER, A .
NATURE, 1986, 324 (6095) :367-369
[2]   Cloning and characterization of the Flavobacterium johnsoniae (Cytophaga johnsonae) gliding motility gene, gldA [J].
Agarwal, S ;
Hunnicutt, DW ;
McBride, MJ .
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 1997, 94 (22) :12139-12144
[3]  
ALTSCHUL SF, 1990, J MOL BIOL, V215, P403, DOI 10.1006/jmbi.1990.9999
[4]  
[Anonymous], METHOD ENZYMOL
[5]   Cutting a gordian knot: Emended classification and description of the genus Flavobacterium, emended description of the family Flavobacteriaceae, and proposal of Flavobacterium hydatis nom nov (basonym, Cytophaga aquatilis Strohl and Tait 1978) [J].
Bernardet, JF ;
Segers, P ;
Vancanneyt, M ;
Berthe, F ;
Kersters, K ;
Vandamme, P .
INTERNATIONAL JOURNAL OF SYSTEMATIC BACTERIOLOGY, 1996, 46 (01) :128-148
[6]   GLIDING MOTILITY OF PROKARYOTES - ULTRASTRUCTURE, PHYSIOLOGY, AND GENETICS [J].
BURCHARD, RP .
ANNUAL REVIEW OF MICROBIOLOGY, 1981, 35 :497-529
[7]  
BURCHARD RP, 1984, MYXOBACTERIA DEV CEL, P301
[8]   ISOLATION AND CHARACTERIZATION OF NONSPREADING MUTANTS OF THE GLIDING BACTERIUM CYTOPHAGA-JOHNSONAE [J].
CHANG, LYE ;
PATE, JL ;
BETZIG, RJ .
JOURNAL OF BACTERIOLOGY, 1984, 159 (01) :26-35
[9]   CONTINUOUS OBSERVATIONS OF BACTERIAL GLIDING MOTILITY IN A DIALYSIS MICROCHAMBER - EFFECTS OF INHIBITORS [J].
DUXBURY, T ;
HUMPHREY, BA ;
MARSHALL, KC .
ARCHIVES OF MICROBIOLOGY, 1980, 124 (2-3) :169-175
[10]   ABC TRANSPORTERS - BACTERIAL EXPORTERS [J].
FATH, MJ ;
KOLTER, R .
MICROBIOLOGICAL REVIEWS, 1993, 57 (04) :995-1017