HAP2/GCS1 family protein similar to Chlamydomonas reinhardtii Hapless 2 that is required on male (minus) gametes for their fusion with female (plus) gametes during fertilization
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative ...
49-495
3.06e-150
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative cell-specific protein 1). HAP2 is expressed only in the haploid sperm and is required for efficient guidance of the pollen tube to the ovules. In Arabidopsis the protein is a predicted membrane protein with an N-terminal secretion signal, a single transmembrane domain and a C-terminal histidine-rich domain. HAP2-GCS1 is found from plants to lower eukaryotes and is necessary for the fusion of the gametes in fertilization. Studies in the green alga Chlamydomonas and the malaria organizm Plasmodium showed that it is involved in a novel mechanism for gamete fusion where a first species-specific protein binds male and female gamete membranes together after which a second, broadly conserved protein, either directly or indirectly, causes fusion of the two membranes together. The broadly conserved protein is represented by this HAP2-GCS1 domain, conserved from plants to lower eukaryotes. In Plasmodium berghei the protein is expressed only in male gametocytes and gametes, having a male-specific function during the interaction with female gametes, and being indispensable for parasite fertilization. The gene in plants and eukaryotes might well have originated from acquisition of plastids from red algae.
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Pssm-ID: 431445 Cd Length: 475 Bit Score: 446.13 E-value: 3.06e-150
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative ...
49-495
3.06e-150
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative cell-specific protein 1). HAP2 is expressed only in the haploid sperm and is required for efficient guidance of the pollen tube to the ovules. In Arabidopsis the protein is a predicted membrane protein with an N-terminal secretion signal, a single transmembrane domain and a C-terminal histidine-rich domain. HAP2-GCS1 is found from plants to lower eukaryotes and is necessary for the fusion of the gametes in fertilization. Studies in the green alga Chlamydomonas and the malaria organizm Plasmodium showed that it is involved in a novel mechanism for gamete fusion where a first species-specific protein binds male and female gamete membranes together after which a second, broadly conserved protein, either directly or indirectly, causes fusion of the two membranes together. The broadly conserved protein is represented by this HAP2-GCS1 domain, conserved from plants to lower eukaryotes. In Plasmodium berghei the protein is expressed only in male gametocytes and gametes, having a male-specific function during the interaction with female gametes, and being indispensable for parasite fertilization. The gene in plants and eukaryotes might well have originated from acquisition of plastids from red algae.
Pssm-ID: 431445 Cd Length: 475 Bit Score: 446.13 E-value: 3.06e-150
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative ...
49-495
3.06e-150
Male gamete fusion factor; The gene encoding Arabidopsis HAP2 is allelic with GCS1 (Generative cell-specific protein 1). HAP2 is expressed only in the haploid sperm and is required for efficient guidance of the pollen tube to the ovules. In Arabidopsis the protein is a predicted membrane protein with an N-terminal secretion signal, a single transmembrane domain and a C-terminal histidine-rich domain. HAP2-GCS1 is found from plants to lower eukaryotes and is necessary for the fusion of the gametes in fertilization. Studies in the green alga Chlamydomonas and the malaria organizm Plasmodium showed that it is involved in a novel mechanism for gamete fusion where a first species-specific protein binds male and female gamete membranes together after which a second, broadly conserved protein, either directly or indirectly, causes fusion of the two membranes together. The broadly conserved protein is represented by this HAP2-GCS1 domain, conserved from plants to lower eukaryotes. In Plasmodium berghei the protein is expressed only in male gametocytes and gametes, having a male-specific function during the interaction with female gametes, and being indispensable for parasite fertilization. The gene in plants and eukaryotes might well have originated from acquisition of plastids from red algae.
Pssm-ID: 431445 Cd Length: 475 Bit Score: 446.13 E-value: 3.06e-150
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
Click on the triangle to view details about the feature, including a multiple sequence alignment
of your query sequence and the protein sequences used to curate the domain model,
where hash marks (#) above the aligned sequences show the location of the conserved feature residues.
The thumbnail image, if present, provides an approximate view of the feature's location in 3 dimensions.
Click on the triangle for interactive 3D structure viewing options.
Functional characterization of the conserved domain architecture found on the query.
Click here to see more details.
This image shows a graphical summary of conserved domains identified on the query sequence.
The Show Concise/Full Display button at the top of the page can be used to select the desired level of detail: only top scoring hits
(labeled illustration) or all hits
(labeled illustration).
Domains are color coded according to superfamilies
to which they have been assigned. Hits with scores that pass a domain-specific threshold
(specific hits) are drawn in bright colors.
Others (non-specific hits) and
superfamily placeholders are drawn in pastel colors.
if a domain or superfamily has been annotated with functional sites (conserved features),
they are mapped to the query sequence and indicated through sets of triangles
with the same color and shade of the domain or superfamily that provides the annotation. Mouse over the colored bars or triangles to see descriptions of the domains and features.
click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
Click on the domain model's accession number to view the multiple sequence alignment of the proteins used to develop the corresponding domain model.
To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
or click on the triangles, if present, that represent functional sites (conserved features)
mapped to the query sequence.
Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
for each region on the query sequence:
specific hits meet or exceed a domain-specific e-value threshold
(illustrated example)
and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
non-specific hits
meet or exceed the RPS-BLAST threshold for statistical significance (default E-value cutoff of 0.01, or an E-value selected by user via the
advanced search options)
the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
(CDART).
Modify your query to search against a different database and/or use advanced search options
