dimerization/docking (D/D) domain found in ropporins; The ROP subfamily includes ropporin-1A (ROP1A, also called cancer/testis antigen 91, CT91, or rhophilin-associated protein 1A), ropporin-1B (ROP1B, also called rhophilin-associated protein 1B), and ropporin-1-like protein (ROPN1L, also called ROPN1-like protein, AKAP-associated sperm protein, or ASP). ROP1A, ROP1B and ROPN1L play important roles in male fertility. They are involved in fibrous sheath integrity and sperm motility and play roles in cAMP-dependent protein kinase (PKA)-dependent signaling processes required for spermatozoa capacitation. Members of this subfamily contain a conserved helical bundle domain that shows high sequence similarity to the dimerization/docking (D/D) domain of the regulatory subunit of PKA, which dimerizes to form a four-helix bundle that serves as a docking site for A-kinase-anchoring proteins (AKAPs). ROP1A and ROP1B have been shown to bind AKAP3.

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                  ....*....|....*....|....*....|....*....|...
gi 2022781830   5 DKPTCIPPELPKMLKEFAKAAIRVQPQDLIQWAADYFEALSRG 47
Cdd:cd23019     1 AQQINIPPELPDILKQFTKAAIRTQPKDLLQWSAAYFRALSKG 43

dimerization/docking (D/D) domain found in ropporins; The ROP subfamily includes ropporin-1A (ROP1A, also called cancer/testis antigen 91, CT91, or rhophilin-associated protein 1A), ropporin-1B (ROP1B, also called rhophilin-associated protein 1B), and ropporin-1-like protein (ROPN1L, also called ROPN1-like protein, AKAP-associated sperm protein, or ASP). ROP1A, ROP1B and ROPN1L play important roles in male fertility. They are involved in fibrous sheath integrity and sperm motility and play roles in cAMP-dependent protein kinase (PKA)-dependent signaling processes required for spermatozoa capacitation. Members of this subfamily contain a conserved helical bundle domain that shows high sequence similarity to the dimerization/docking (D/D) domain of the regulatory subunit of PKA, which dimerizes to form a four-helix bundle that serves as a docking site for A-kinase-anchoring proteins (AKAPs). ROP1A and ROP1B have been shown to bind AKAP3.

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                  ....*....|....*....|....*....|....*....|...
gi 2022781830   5 DKPTCIPPELPKMLKEFAKAAIRVQPQDLIQWAADYFEALSRG 47
Cdd:cd23019     1 AQQINIPPELPDILKQFTKAAIRTQPKDLLQWSAAYFRALSKG 43

dimerization/docking (D/D) domain found in ropporins; The ROP subfamily includes ropporin-1A (ROP1A, also called cancer/testis antigen 91, CT91, or rhophilin-associated protein 1A), ropporin-1B (ROP1B, also called rhophilin-associated protein 1B), and ropporin-1-like protein (ROPN1L, also called ROPN1-like protein, AKAP-associated sperm protein, or ASP). ROP1A, ROP1B and ROPN1L play important roles in male fertility. They are involved in fibrous sheath integrity and sperm motility and play roles in cAMP-dependent protein kinase (PKA)-dependent signaling processes required for spermatozoa capacitation. Members of this subfamily contain a conserved helical bundle domain that shows high sequence similarity to the dimerization/docking (D/D) domain of the regulatory subunit of PKA, which dimerizes to form a four-helix bundle that serves as a docking site for A-kinase-anchoring proteins (AKAPs). ROP1A and ROP1B have been shown to bind AKAP3.

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                  ....*....|....*....|....*....|....*....|...
gi 2022781830   5 DKPTCIPPELPKMLKEFAKAAIRVQPQDLIQWAADYFEALSRG 47
Cdd:cd23019     1 AQQINIPPELPDILKQFTKAAIRTQPKDLLQWSAAYFRALSKG 43

dimerization/docking (D/D) domain found in Chlamydomonas reinhardtii flagellar radial spoke protein 11 (RSP11) and similar proteins; Flagellar radial spokes contribute to the regulation of dynein arm activity and thus the pattern of flagellar bending. They consist of a thin stalk, which is attached to a subfiber of the outer doublet microtubule, and a bulbous head, which is attached to the stalk and appears to interact with the projections from the central pair of microtubules. RSP11 is a non-PKA (cAMP-dependent protein kinase) RIIa protein that contains a RII domain but lack any features required for cAMP signaling or phosphorylation. It is involved in the control of ciliary and flagellar beating. RSP11 contains an N-terminal domain which shows high sequence similarity to the dimerization/docking (D/D) domain of regulatory subunit of PKA. The D/D domain of RSP11 heterodimerizes with the D/D domain of RSP7 to form an X-type four-helix bundle within the radial spoke RS1 complex.

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                  ....*....|....*....|....*....|....*.
gi 2022781830  10 IPPELPKMLKEFAKAAIRVQPQDLIQWAADYFEALS 45
Cdd:cd22985    11 IPPELPDILKNYTKEVIRAQPADLYEFSAEYFAKLA 46

dimerization/docking (D/D) domain of the type II Regulatory subunit of cAMP-dependent protein kinase and similar domains; cAMP-dependent protein kinase (PKA) is a serine/threonine kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The inactive PKA holoenzyme is a heterotetramer composed of two phosphorylated and active catalytic subunits with a dimer of regulatory (R) subunits. Activation is achieved through the binding of the important second messenger cAMP to the R subunits, which leads to the dissociation of PKA into the R dimer and two active subunits. There are two classes of R subunits, RI and RII; each exists as two isoforms (alpha and beta) from distinct genes. These functionally non-redundant R isoforms allow for specificity in PKA signaling. The R subunit contains an N-terminal dimerization/docking (D/D) domain, a linker with an inhibitory sequence (IS), and two c-AMP binding domains. RI and RII subunits are distinguished by their IS; RII subunits contain a phosphorylation site and are both substrates and inhibitors while RI subunits are pseudo-substrates. RI subunits require ATP and Mg ions to form a stable holoenzyme while RII subunits do not. The D/D domain dimerizes to form a four-helix bundle that serves as a docking site for A-kinase-anchoring proteins (AKAPs), which facilitates the localization of PKA to specific sites in the cell. PKA is present ubiquitously in cells and interacts with many different downstream targets. It plays a role in the regulation of diverse processes such as growth, development, memory, metabolism, gene expression, immunity, and lipolysis.

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                  ....*....|....*....|....*....|....*
gi 2022781830  10 IPPELPKMLKEFAKAAIRVQPQDLIQWAADYFEAL 44
Cdd:cd12084     1 VPEGLRELLEDFTREVLREQPEDVYEFAADYFEKL 35

dimerization/docking (D/D) domain found in Saccharomyces cerevisiae cAMP-dependent protein kinase regulatory subunit and similar domains; cAMP-dependent protein kinase (PKA) is a serine/threonine kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to serine/threonine residues on protein substrates. The inactive PKA holoenzyme is a heterotetramer composed of two phosphorylated and active catalytic subunits with a dimer of regulatory (R) subunits. Activation is achieved through the binding of the important second messenger cAMP to the R subunits, which leads to the dissociation of PKA into the R dimer and two active subunits. The R subunit of fungal PKA is encoded by a single gene, which is called by various names in different organisms (for example: Yarrowia lipolytica RKA1, Saccharomyces cerevisiae Bcy1, and Schizosaccharomyces pombe Cgs1). Although most characterized PKA holoenzymes are tetramers, Y. lipolytica PKA has been reported to be a dimer of RKA1 and the catalytic subunit TPK1. RKA1 is essential and promotes hyphal growth. Cgs1 is essential for sexual differentiation of S. pombe; mutants with defective Cgs1 are partially sterile. The R subunit contains an N-terminal dimerization/docking (D/D) domain, a linker with an inhibitory sequence, and two c-AMP binding domains. The D/D domain of metazoan R subunits dimerizes to form a four-helix bundle that serves as a docking site for A-kinase-anchoring proteins (AKAPs). The D/D domain of fungal R subunits may also serve as a dimerization domain, in the case of heterotetrameric PKAs. Fungal PKA plays a major role in controlling cell growth and metabolism in response to nutrients and stress conditions.

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gi 2022781830  10 IPPELPKMLKEFAKAAIRVQPQDLIQWAADYF 41
Cdd:cd12098     1 LPSEYPDELNELNREVLRAQPDDILQFCANYF 32

dimerization/docking (D/D) domain found in RIIa domain-containing protein 1 (RIIAD1) and similar proteins; The family includes uncharacterized RIIa domain-containing protein 1 (RIIAD1), which contains a C-terminal domain that shows high sequence similarity to the dimerization/docking (D/D) domain of regulatory subunit of cAMP-dependent protein kinase (PKA).

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gi 2022781830  12 PELPKMLKEFAKAAIRVQPQDLIQWAADYF 41
Cdd:cd22971     4 PEIRALISGFLREVLKKKPENIREFAAEFF 33

RIIalpha, Regulatory subunit portion of type II PKA R-subunit; RIIalpha, Regulatory subunit portion of type II PKA R-subunit. Contains dimerisation interface and binding site for A-kinase-anchoring proteins (AKAPs).

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                   ....*....|....*....|....*....|...
gi 2022781830   12 PELPKMLKEFAKAAIRVQPQDLIQWAADYFEAL 44
Cdd:smart00394   1 HGLQALLEDLTVEVLRAQPSDLVQFAADYFEKL 33