Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath an ...
Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath and around the dense outer fibres of the sperm flagellum [1]. The amino-terminal domain (residues 1-110) shows a possible calponin homology (CH) domain; however Spef does not bind actin directly under in vitro conditions, so the function of the amino-terminal calponin-like domain is unclear [1]. Transcription aberrations leading to a truncated protein result in immotile sperm [2].
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to i ...
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to intestinal growth or pathogenesis, although is not the only factor required for intestinal survival. VesB can cleave the A subunit of cholera toxin, a process important for cholera toxin activation [1]. It consists of a protease domain (Pfam:PF00089) followed by a Ig-like domain, represented in this entry, which may be involved in one or more different functions such as stabilizing the protease domain, co-defining substrate specificity, binding to the bacterial surface and being part of a yet undefined secretion motif of the T2S system [1]. This protein belongs to the chymotrypsin subfamily A (which includes mostly eukaryotic proteases), having a structure and specificity profile resembling that of eukaryotic trypsin-like proteases. This domain is also found in some eukaryotic proteins, such as HYDIN and CFA65 from human (which contain repeated Ig-like domains).
This family includes a diverse range of phosphoesterases [1], including protein phosphoserine phosphatases, nucleotidases, sphingomyelin phosphodiesterases and 2'-3' cAMP phosphodiesterases as well as nucleases such as bacterial SbcD Swiss:P13457 or ...
This family includes a diverse range of phosphoesterases [1], including protein phosphoserine phosphatases, nucleotidases, sphingomyelin phosphodiesterases and 2'-3' cAMP phosphodiesterases as well as nucleases such as bacterial SbcD Swiss:P13457 or yeast MRE11 Swiss:P32829. The most conserved regions in this superfamily centre around the metal chelating residues.
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to i ...
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to intestinal growth or pathogenesis, although is not the only factor required for intestinal survival. VesB can cleave the A subunit of cholera toxin, a process important for cholera toxin activation [1]. It consists of a protease domain (Pfam:PF00089) followed by a Ig-like domain, represented in this entry, which may be involved in one or more different functions such as stabilizing the protease domain, co-defining substrate specificity, binding to the bacterial surface and being part of a yet undefined secretion motif of the T2S system [1]. This protein belongs to the chymotrypsin subfamily A (which includes mostly eukaryotic proteases), having a structure and specificity profile resembling that of eukaryotic trypsin-like proteases. This domain is also found in some eukaryotic proteins, such as HYDIN and CFA65 from human (which contain repeated Ig-like domains).
Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath an ...
Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath and around the dense outer fibres of the sperm flagellum [1]. The amino-terminal domain (residues 1-110) shows a possible calponin homology (CH) domain; however Spef does not bind actin directly under in vitro conditions, so the function of the amino-terminal calponin-like domain is unclear [1]. Transcription aberrations leading to a truncated protein result in immotile sperm [2].
This domain is found in the axoneme central apparatus (CA) associated proteins such as Chlamydomonas Central pair complex 1 (CPC1) and its mammalian orthologues Sperm flagellar protein 2 (SPEF2) [1,2]. CPC1 is located at C1 microtubule. Most of the d ...
This domain is found in the axoneme central apparatus (CA) associated proteins such as Chlamydomonas Central pair complex 1 (CPC1) and its mammalian orthologues Sperm flagellar protein 2 (SPEF2) [1,2]. CPC1 is located at C1 microtubule. Most of the distal components of the C1b projection bind CPC1 and its correct recruitment and positioning is critical to the formation of the C1b projection, and ciliary motility in Chlamydomonas and humans [3]. CPC1 serves as the rachis of the entire C1b arm and this domain contributes to this function [4]. It folds into a single long alpha-helix.
This domain is found associated with Pfam:PF00651 and Pfam:PF01344 [1]. The BACK domain is found juxtaposed to the BTB domain; they are separated by as little as two residues [1]. This family appears to be closely related to the BTB domain (Finn RD, ...
This domain is found associated with Pfam:PF00651 and Pfam:PF01344 [1]. The BACK domain is found juxtaposed to the BTB domain; they are separated by as little as two residues [1]. This family appears to be closely related to the BTB domain (Finn RD, personal observation).
The BTB (for BR-C, ttk and bab) [1] or POZ (for Pox virus and Zinc finger) [2] domain is present near the N-terminus of a fraction of zinc finger (Pfam:PF00096) proteins and in proteins that contain the Pfam:PF01344 motif such as Kelch and a family o ...
The BTB (for BR-C, ttk and bab) [1] or POZ (for Pox virus and Zinc finger) [2] domain is present near the N-terminus of a fraction of zinc finger (Pfam:PF00096) proteins and in proteins that contain the Pfam:PF01344 motif such as Kelch and a family of pox virus proteins. The BTB/POZ domain mediates homomeric dimerisation and in some instances heteromeric dimerisation [2]. The structure of the dimerised PLZF BTB/POZ domain has been solved and consists of a tightly intertwined homodimer. The central scaffolding of the protein is made up of a cluster of alpha-helices flanked by short beta-sheets at both the top and bottom of the molecule [3]. POZ domains from several zinc finger proteins have been shown to mediate transcriptional repression and to interact with components of histone deacetylase co-repressor complexes including N-CoR and SMRT [4,5,6]. The POZ or BTB domain is also known as BR-C/Ttk or ZiN.
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to i ...
VesB is a serine protease that is secreted by the type II secretion system (T2S) in Vibrio cholerae (Swiss:Q9KSQ6). It efficiently cleaves a trypsin substrate, but not chymotrypsin and elastase substrates [1]. It has been suggested to contribute to intestinal growth or pathogenesis, although is not the only factor required for intestinal survival. VesB can cleave the A subunit of cholera toxin, a process important for cholera toxin activation [1]. It consists of a protease domain (Pfam:PF00089) followed by a Ig-like domain, represented in this entry, which may be involved in one or more different functions such as stabilizing the protease domain, co-defining substrate specificity, binding to the bacterial surface and being part of a yet undefined secretion motif of the T2S system [1]. This protein belongs to the chymotrypsin subfamily A (which includes mostly eukaryotic proteases), having a structure and specificity profile resembling that of eukaryotic trypsin-like proteases. This domain is also found in some eukaryotic proteins, such as HYDIN and CFA65 from human (which contain repeated Ig-like domains).
This family includes the tubulin alpha, beta and gamma chains, as well as the bacterial FtsZ family of proteins. Members of this family are involved in polymer formation. FtsZ is the polymer-forming protein of bacterial cell division. It is part of a ...
This family includes the tubulin alpha, beta and gamma chains, as well as the bacterial FtsZ family of proteins. Members of this family are involved in polymer formation. FtsZ is the polymer-forming protein of bacterial cell division. It is part of a ring in the middle of the dividing cell that is required for constriction of cell membrane and cell envelope to yield two daughter cells. FtsZ and tubulin are GTPases. FtsZ can polymerise into tubes, sheets, and rings in vitro and is ubiquitous in eubacteria and archaea. Tubulin is the major component of microtubules.
This family includes the tubulin alpha, beta and gamma chains. Members of this family are involved in polymer formation. Tubulins are GTPases. FtsZ can polymerise into tubes, sheets, and rings in vitro and is ubiquitous in eubacteria and archaea. Tub ...
This family includes the tubulin alpha, beta and gamma chains. Members of this family are involved in polymer formation. Tubulins are GTPases. FtsZ can polymerise into tubes, sheets, and rings in vitro and is ubiquitous in eubacteria and archaea. Tubulin is the major component of microtubules. (The FtsZ GTPases have been split into their won family).
This domain is characteristic of cilia- and flagella-associated protein 20 (CFA20). CFA20 is a cilium- and flagellum-specific protein that plays a role in axonemal structure organisation and motility [1,2]. In Chlamydomonas reinhardtii, it stabilises ...
This domain is characteristic of cilia- and flagella-associated protein 20 (CFA20). CFA20 is a cilium- and flagellum-specific protein that plays a role in axonemal structure organisation and motility [1,2]. In Chlamydomonas reinhardtii, it stabilises outer doublet microtubules (DMTs) of the axoneme and may work as a scaffold for intratubular proteins, such as tektin and PACRG, to produce the beak structures in DMT1 [2,3]. Other proteins contain a domain with homology to CFA20. WDR90/POC16 contains such a domain in its N terminus, followed by a large C-terminal domain with multiple WD40 repeats [2]. This domain is also present in the N terminus of uncharacterised protein C3orf67.
Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath an ...
Spef is a region of sperm flagellar proteins. It probably exerts a role in spermatogenesis in that the protein is expressed predominantly in adult tissue. It is present in the tails of developing and epididymal sperm internal to the fibrous sheath and around the dense outer fibres of the sperm flagellum [1]. The amino-terminal domain (residues 1-110) shows a possible calponin homology (CH) domain; however Spef does not bind actin directly under in vitro conditions, so the function of the amino-terminal calponin-like domain is unclear [1]. Transcription aberrations leading to a truncated protein result in immotile sperm [2].
