Protein Family Models

This short motif directs methylation of the conserved phenylalanine residue. It is most often found at the N-terminus of pilins and other proteins involved in secretion, see Pfam:PF00114, Pfam:PF05946, Pfam:PF02501 and Pfam:PF07596. (from Pfam)

Date:

2024-08-14

The Type II secretion system, also called Secretion-dependent pathway (SDP), is responsible for the transport of proteins across the outer membrane first exported to the periplasm by the Sec or Tat translocon in Gram-negative (diderm) bacteria. As members of the T2SJ family, members of the T2SI family are pseudopilins containing prepilin signal sequences [1]. [1]. 8407845. Isolation and analysis of eight exe genes and their involvement in extracellular protein secretion and outer membrane assembly in Aeromonas hydrophila. Howard SP, Critch J, Bedi A;. J Bacteriol 1993;175:6695-6703. [2]. 15223057. The general secretory pathway: a general misnomer?. Desvaux M, Parham NJ, Scott-Tucker A, Henderson IR;. Trends Microbiol. 2004;12:306-309. [3]. 14600218. Type II protein secretion and its relationship to bacterial type IV pili and archaeal flagella. Peabody CR, Chung YJ, Yen MR, Vidal-Ingigliardi D, Pugsley AP, Saier MH Jr;. Microbiology. 2003;149:3051-3072. [4]. 19299134. Secretion and subcellular localizations of bacterial proteins: a semantic awareness issue. Desvaux M, Hebraud M, Talon R, Henderson IR;. Trends Microbiol. 2009;17:139-145. (from Pfam)

Date:

2024-10-16

type II secretion system (T2SS) protein GspI is a component of the T2SS required for the energy-dependent secretion of extracellular factors such as proteases and toxins from the periplasm

Date:

2020-06-03

This HMM represents GspI, one of two proteins highly conserved at their N-termini and described by PF02501 but easily separable phylogenetically. The other is GspJ. Both GspI and GspJ are proteins of the type II secretion pathway, or main terminal branch of the general secretion pathway. This pathway carries proteins across the outer membrane. Note that proteins of type II secretion are cryptic in E. coli K-12 - present but not yet demonstrated to act on any target.

Gene:

gspI

Date:

2021-05-12

This model describes many but not all examples of the N-terminal region of bacterial proteins that resemble type IV pilins at their N-terminus, with a cleavage site G^FxxxE followed by a hydrophobic stretch. The new N-terminal residue, usually Phe, is methylated. Separate domains of the prepilin peptidase appear responsible for cleavage and methylation. Proteins with this N-terminal region include type IV pilins and other components of pilus biogenesis, competence proteins, and type II secretion proteins. Typically several proteins in a single operon have this N-terminal domain. The N-terminal cleavage and methylation site is described by PROSITE motif PS00409 as [KRHEQSTAG]-G-[FYLIVM]-[ST]-[LT]-[LIVP]-E-[LIVMFWSTAG](14).

Date:

2019-09-10