sex pili
Fine filamentous projections (pili) on the surface of a bacterium that are important in conjugation. Often seem to be coded for by plasmids that confer conjugative potential on the host; in the case of the F-plasmid, the F-pili are 8-9nm diameter and several microns long, composed of pilin. Whether the pili merely serve to establish and maintain adhesive contact between the partners in conjugation, or whether DNA is actually transferred through the central core of the pilus is still unresolved, although a simple adhesion role is more generally accepted.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • sex pilus — (pi lus) A thin protein appendage required for bacterial mating or conjugation. The cell with sex pili donates DNA to recipient cells …   Dictionary of microbiology

  • pilus — (= pili (plural) ; fimbrium, fimbria (plural) ) Hair like projection from surface of some bacteria. Involved in adhesion to surfaces (may be important in virulence), and specialized sex pili are involved in conjugation with other bacteria. Major… …   Dictionary of molecular biology

  • Pilus — Schematic drawing of bacterial conjugation. 1 Donor cell produces pilus. 2 Pilus attaches to recipient cell, brings the two cells together. 3 The mobile plasmid is nicked and a single strand of DNA is then transferred to the recipient cell. 4… …   Wikipedia

  • Cell (biology) — Allium cells in different phases of the cell cycle …   Wikipedia

  • bacteria — bacterial, adj. bacterially, adv. /bak tear ee euh/, n.pl., sing. bacterium / tear ee euhm/. ubiquitous one celled organisms, spherical, spiral, or rod shaped and appearing singly or in chains, comprising the Schizomycota, a phylum of the kingdom …   Universalium

  • Bacterial cell structure — Bacteria, despite their apparent simplicity, contain a well developed cell structure which is responsible for many of their unique biological properties. Many structural features are unique to bacteria and are not found among archaea or… …   Wikipedia

  • Virus — A microorganism smaller than a bacteria, which cannot grow or reproduce apart from a living cell. A virus invades living cells and uses their chemical machinery to keep itself alive and to replicate itself. It may reproduce with fidelity or with… …   Medical dictionary

  • Konjugation bei Bakterien — Konjugation bezeichnet in der Cytogenetik die Übertragung von Teilen des Genoms von einer Spenderzelle auf eine Empfängerzelle. Darüber hinaus wird der Begriff in der Mykologie, der Lehre von den Pilzen, für die geschlechtliche Verschmelzung… …   Deutsch Wikipedia

  • pilin — (1) General term for the protein subunit of pilus. (2) Protein subunit (7.2 kD) of F pili, sex pili coded for by the F plasmid …   Dictionary of molecular biology

  • conjugative plasmid — A plasmid that carries the genes for sex pili and can transfer copies of itself to other bacteria during conjugation …   Dictionary of microbiology

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”