List of proteins associated with GO term: GO:0015807   L-amino acid transport
Protein ID
Link to complete
analysis report

Confident Level
for GO:0015807
All predicted GO Terms
1g009469m portable GO:0005315, confident, inorganic phosphate transmembrane transporter activity
GO:0009535, confident, chloroplast thylakoid membrane
GO:0009706, confident, chloroplast inner membrane
GO:0009624, portable, response to nematode
GO:0009416, portable, response to light stimulus
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0008021, portable, synaptic vesicle
GO:0006098, portable, pentose-phosphate shunt
GO:0009867, portable, jasmonic acid mediated signaling pathway
GO:0009697, portable, salicylic acid biosynthetic process
GO:0005886, portable, plasma membrane
GO:0000165, portable, MAPK cascade
GO:0015807, portable, L-amino acid transport
GO:0010310, portable, regulation of hydrogen peroxide metabolic process
GO:0006612, portable, protein targeting to membrane
GO:0015706, portable, nitrate transport
GO:0031348, portable, negative regulation of defense response
GO:0042742, portable, defense response to bacterium
GO:0050832, portable, defense response to fungus
GO:0009862, portable, systemic acquired resistance, salicylic acid mediated signaling pathway
GO:0010200, portable, response to chitin
GO:0043900, portable, regulation of multi-organism process
GO:0016529, portable, sarcoplasmic reticulum
GO:0009595, portable, detection of biotic stimulus
GO:0016021, portable, integral to membrane
GO:0042631, portable, cellular response to water deprivation
GO:0055085, portable, transmembrane transport
GO:0015114, portable, phosphate ion transmembrane transporter activity
GO:0010363, portable, regulation of plant-type hypersensitive response
GO:0005351, portable, sugar:hydrogen symporter activity
GO:0046943, portable, carboxylic acid transmembrane transporter activity
1g012519m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0044237, portable, cellular metabolic process
GO:0008021, portable, synaptic vesicle
GO:0015698, portable, inorganic anion transport
GO:0044707, portable, single-multicellular organism process
GO:0015807, portable, L-amino acid transport
GO:0015739, portable, sialic acid transport
GO:0005783, portable, endoplasmic reticulum
GO:0015136, portable, sialic acid transmembrane transporter activity
GO:0006814, portable, sodium ion transport
GO:0009535, portable, chloroplast thylakoid membrane
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0005764, portable, lysosome
GO:0050896, portable, response to stimulus
GO:0005436, portable, sodium:phosphate symporter activity
GO:0012505, portable, endomembrane system
GO:0065007, portable, biological regulation
1g014358m portable GO:0005774, portable, vacuolar membrane
GO:0005886, portable, plasma membrane
GO:0034220, portable, ion transmembrane transport
GO:0015807, portable, L-amino acid transport
GO:0015809, portable, arginine transport
GO:0015179, portable, L-amino acid transmembrane transporter activity
GO:0015181, portable, arginine transmembrane transporter activity
1g006102m portable GO:0009705, confident, plant-type vacuole membrane
GO:0003333, portable, amino acid transmembrane transport
GO:0009684, portable, indoleacetic acid biosynthetic process
GO:0048573, portable, photoperiodism, flowering
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0006635, portable, fatty acid beta-oxidation
GO:0070838, portable, divalent metal ion transport
GO:0006569, portable, tryptophan catabolic process
GO:0015809, portable, arginine transport
GO:0016558, portable, protein import into peroxisome matrix
GO:0015181, portable, arginine transmembrane transporter activity
GO:0015326, portable, cationic amino acid transmembrane transporter activity
GO:0030003, portable, cellular cation homeostasis
1g009978m portable GO:0005315, confident, inorganic phosphate transmembrane transporter activity
GO:0009535, portable, chloroplast thylakoid membrane
GO:0044237, portable, cellular metabolic process
GO:0034220, portable, ion transmembrane transport
GO:0015807, portable, L-amino acid transport
GO:0005313, portable, L-glutamate transmembrane transporter activity
GO:0009624, portable, response to nematode
GO:0015319, portable, sodium:inorganic phosphate symporter activity
GO:0009416, portable, response to light stimulus
GO:0006835, portable, dicarboxylic acid transport
GO:0001505, portable, regulation of neurotransmitter levels
GO:0015706, portable, nitrate transport
GO:0015739, portable, sialic acid transport
GO:0048786, portable, presynaptic active zone
GO:0015136, portable, sialic acid transmembrane transporter activity
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0030672, portable, synaptic vesicle membrane
GO:0006814, portable, sodium ion transport
GO:0015321, portable, sodium-dependent phosphate transmembrane transporter activity
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0005764, portable, lysosome
GO:0044341, portable, sodium-dependent phosphate transport
GO:0005351, portable, sugar:hydrogen symporter activity
1g021309m portable GO:0005886, confident, plasma membrane
GO:0015744, confident, succinate transport
GO:0005743, portable, mitochondrial inner membrane
GO:0016006, portable, Nebenkern
GO:0043066, portable, negative regulation of apoptotic process
GO:0015227, portable, acyl carnitine transmembrane transporter activity
GO:0015992, portable, proton transport
GO:0006843, portable, mitochondrial citrate transport
GO:0005371, portable, tricarboxylate secondary active transmembrane transporter activity
GO:0000303, portable, response to superoxide
GO:0015741, portable, fumarate transport
GO:0005469, portable, succinate:fumarate antiporter activity
GO:0009506, portable, plasmodesma
GO:0006844, portable, acyl carnitine transport
GO:0005811, portable, lipid particle
GO:0005774, portable, vacuolar membrane
GO:0005794, portable, Golgi apparatus
GO:0015078, portable, hydrogen ion transmembrane transporter activity
GO:0006094, portable, gluconeogenesis
GO:0045177, portable, apical part of cell
GO:0046324, portable, regulation of glucose import
GO:0014823, portable, response to activity
GO:0043132, portable, NAD transport
GO:0048250, portable, mitochondrial iron ion transport
GO:0015807, portable, L-amino acid transport
GO:0046483, portable, heterocycle metabolic process
GO:0007584, portable, response to nutrient
GO:0008284, portable, positive regulation of cell proliferation
GO:0015189, portable, L-lysine transmembrane transporter activity
GO:0015137, portable, citrate transmembrane transporter activity
GO:0035674, portable, tricarboxylic acid transmembrane transport
GO:0005290, portable, L-histidine transmembrane transporter activity
GO:0035338, portable, long-chain fatty-acyl-CoA biosynthetic process
GO:0010038, portable, response to metal ion
GO:0010942, portable, positive regulation of cell death
GO:0005618, portable, cell wall
GO:0006554, portable, lysine catabolic process
GO:0071805, portable, potassium ion transmembrane transport
GO:0097421, portable, liver regeneration
GO:0061179, portable, negative regulation of insulin secretion involved in cellular response to glucose stimulus
GO:0001666, portable, response to hypoxia
GO:0034641, portable, cellular nitrogen compound metabolic process
GO:0031969, portable, chloroplast membrane
GO:0009409, portable, response to cold
GO:0044351, portable, macropinocytosis
GO:0015181, portable, arginine transmembrane transporter activity
GO:0019432, portable, triglyceride biosynthetic process
GO:0071333, portable, cellular response to glucose stimulus
GO:0032869, portable, cellular response to insulin stimulus
GO:0009062, portable, fatty acid catabolic process
GO:0010917, portable, negative regulation of mitochondrial membrane potential
GO:0007565, portable, female pregnancy
GO:0070542, portable, response to fatty acid
GO:0035356, portable, cellular triglyceride homeostasis
GO:0051724, portable, NAD transporter activity
GO:0016021, portable, integral to membrane
GO:0035071, portable, salivary gland cell autophagic cell death
GO:0034755, portable, iron ion transmembrane transport
GO:0043025, portable, neuronal cell body
GO:1901360, portable, organic cyclic compound metabolic process
GO:0051384, portable, response to glucocorticoid stimulus
GO:0045733, portable, acetate catabolic process
GO:0007568, portable, aging
GO:0034198, portable, cellular response to amino acid starvation
GO:0022904, portable, respiratory electron transport chain
GO:0006357, portable, regulation of transcription from RNA polymerase II promoter
GO:0005381, portable, iron ion transmembrane transporter activity
GO:0017077, portable, oxidative phosphorylation uncoupler activity
GO:0015976, portable, carbon utilization
1g013144m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0044237, portable, cellular metabolic process
GO:0008021, portable, synaptic vesicle
GO:0015698, portable, inorganic anion transport
GO:0015807, portable, L-amino acid transport
GO:0015739, portable, sialic acid transport
GO:0015136, portable, sialic acid transmembrane transporter activity
GO:0006814, portable, sodium ion transport
GO:0009535, portable, chloroplast thylakoid membrane
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0005764, portable, lysosome
GO:0005436, portable, sodium:phosphate symporter activity
GO:0012505, portable, endomembrane system
1g035132m portable GO:0009705, portable, plant-type vacuole membrane
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0015809, portable, arginine transport
GO:0015181, portable, arginine transmembrane transporter activity
GO:0003333, portable, amino acid transmembrane transport
1g010690m portable GO:0009705, confident, plant-type vacuole membrane
GO:0005886, portable, plasma membrane
GO:0003333, portable, amino acid transmembrane transport
GO:0009684, portable, indoleacetic acid biosynthetic process
GO:0048573, portable, photoperiodism, flowering
GO:0015807, portable, L-amino acid transport
GO:0006635, portable, fatty acid beta-oxidation
GO:0015804, portable, neutral amino acid transport
GO:0070838, portable, divalent metal ion transport
GO:0006569, portable, tryptophan catabolic process
GO:0015809, portable, arginine transport
GO:0015291, portable, secondary active transmembrane transporter activity
GO:0005576, portable, extracellular region
GO:0016558, portable, protein import into peroxisome matrix
GO:0015179, portable, L-amino acid transmembrane transporter activity
GO:0015181, portable, arginine transmembrane transporter activity
GO:0015326, portable, cationic amino acid transmembrane transporter activity
GO:0015175, portable, neutral amino acid transmembrane transporter activity
GO:0030003, portable, cellular cation homeostasis
1g014634m portable GO:0015824, portable, proline transport
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0005313, portable, L-glutamate transmembrane transporter activity
GO:0015183, portable, L-aspartate transmembrane transporter activity
GO:0005290, portable, L-histidine transmembrane transporter activity
GO:0008028, portable, monocarboxylic acid transmembrane transporter activity
GO:0015186, portable, L-glutamine transmembrane transporter activity
GO:0015194, portable, L-serine transmembrane transporter activity
GO:0000329, portable, fungal-type vacuole membrane
GO:0015173, portable, aromatic amino acid transmembrane transporter activity
GO:0005275, portable, amine transmembrane transporter activity
GO:0006814, portable, sodium ion transport
GO:0015191, portable, L-methionine transmembrane transporter activity
GO:0015182, portable, L-asparagine transmembrane transporter activity
GO:0043025, portable, neuronal cell body
GO:0009507, portable, chloroplast
GO:0030424, portable, axon
GO:0050896, portable, response to stimulus
GO:0015190, portable, L-leucine transmembrane transporter activity
GO:0003333, portable, amino acid transmembrane transport
GO:0015180, portable, L-alanine transmembrane transporter activity
1g007966m portable GO:0009705, confident, plant-type vacuole membrane
GO:0005886, portable, plasma membrane
GO:0003333, portable, amino acid transmembrane transport
GO:0009684, portable, indoleacetic acid biosynthetic process
GO:0048573, portable, photoperiodism, flowering
GO:0015807, portable, L-amino acid transport
GO:0006635, portable, fatty acid beta-oxidation
GO:0015804, portable, neutral amino acid transport
GO:0070838, portable, divalent metal ion transport
GO:0006569, portable, tryptophan catabolic process
GO:0015809, portable, arginine transport
GO:0015291, portable, secondary active transmembrane transporter activity
GO:0005576, portable, extracellular region
GO:0016558, portable, protein import into peroxisome matrix
GO:0015179, portable, L-amino acid transmembrane transporter activity
GO:0015181, portable, arginine transmembrane transporter activity
GO:0015326, portable, cationic amino acid transmembrane transporter activity
GO:0015175, portable, neutral amino acid transmembrane transporter activity
GO:0030003, portable, cellular cation homeostasis
1g007682m portable GO:0009705, confident, plant-type vacuole membrane
GO:0005886, portable, plasma membrane
GO:0003333, portable, amino acid transmembrane transport
GO:0009684, portable, indoleacetic acid biosynthetic process
GO:0048573, portable, photoperiodism, flowering
GO:0015807, portable, L-amino acid transport
GO:0006635, portable, fatty acid beta-oxidation
GO:0015804, portable, neutral amino acid transport
GO:0070838, portable, divalent metal ion transport
GO:0006569, portable, tryptophan catabolic process
GO:0015809, portable, arginine transport
GO:0015291, portable, secondary active transmembrane transporter activity
GO:0005576, portable, extracellular region
GO:0016558, portable, protein import into peroxisome matrix
GO:0015179, portable, L-amino acid transmembrane transporter activity
GO:0015181, portable, arginine transmembrane transporter activity
GO:0015326, portable, cationic amino acid transmembrane transporter activity
GO:0015175, portable, neutral amino acid transmembrane transporter activity
GO:0030003, portable, cellular cation homeostasis
1g010928m portable GO:0015172, portable, acidic amino acid transmembrane transporter activity
GO:0080167, portable, response to karrikin
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0030968, portable, endoplasmic reticulum unfolded protein response
GO:0015399, portable, primary active transmembrane transporter activity
GO:0006868, portable, glutamine transport
GO:0031348, portable, negative regulation of defense response
GO:0015810, portable, aspartate transport
GO:0015186, portable, L-glutamine transmembrane transporter activity
GO:0005275, portable, amine transmembrane transporter activity
GO:0015185, portable, gamma-aminobutyric acid transmembrane transporter activity
GO:0015193, portable, L-proline transmembrane transporter activity
GO:0010075, portable, regulation of meristem growth
GO:0030424, portable, axon
GO:0015827, portable, tryptophan transport
GO:0003333, portable, amino acid transmembrane transport
1g014481m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0008021, portable, synaptic vesicle
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0009535, portable, chloroplast thylakoid membrane
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0015114, portable, phosphate ion transmembrane transporter activity
GO:0046943, portable, carboxylic acid transmembrane transporter activity
1g013039m portable GO:0080167, confident, response to karrikin
GO:0015172, confident, acidic amino acid transmembrane transporter activity
GO:0005886, confident, plasma membrane
GO:0006499, portable, N-terminal protein myristoylation
GO:0006862, portable, nucleotide transport
GO:0015802, portable, basic amino acid transport
GO:0030968, portable, endoplasmic reticulum unfolded protein response
GO:0006612, portable, protein targeting to membrane
GO:0043069, portable, negative regulation of programmed cell death
GO:0009536, portable, plastid
GO:0015696, portable, ammonium transport
GO:0005275, portable, amine transmembrane transporter activity
GO:0043269, portable, regulation of ion transport
GO:0015185, portable, gamma-aminobutyric acid transmembrane transporter activity
GO:0006944, portable, cellular membrane fusion
GO:0010363, portable, regulation of plant-type hypersensitive response
GO:0006888, portable, ER to Golgi vesicle-mediated transport
GO:0015824, portable, proline transport
GO:0015807, portable, L-amino acid transport
GO:0005783, portable, endoplasmic reticulum
GO:0015399, portable, primary active transmembrane transporter activity
GO:0015810, portable, aspartate transport
GO:0043090, portable, amino acid import
GO:0015837, portable, amine transport
GO:0015193, portable, L-proline transmembrane transporter activity
GO:0015812, portable, gamma-aminobutyric acid transport
GO:0015827, portable, tryptophan transport
GO:0005774, portable, vacuolar membrane
1g016394m portable GO:0009941, confident, chloroplast envelope
GO:0010039, confident, response to iron ion
GO:0044237, portable, cellular metabolic process
GO:0005743, portable, mitochondrial inner membrane
GO:0006862, portable, nucleotide transport
GO:0005886, portable, plasma membrane
GO:0015746, portable, citrate transport
GO:0048250, portable, mitochondrial iron ion transport
GO:0034220, portable, ion transmembrane transport
GO:0015807, portable, L-amino acid transport
GO:0015189, portable, L-lysine transmembrane transporter activity
GO:0005290, portable, L-histidine transmembrane transporter activity
GO:0016006, portable, Nebenkern
GO:0015805, portable, S-adenosyl-L-methionine transport
GO:0015181, portable, arginine transmembrane transporter activity
GO:0000095, portable, S-adenosyl-L-methionine transmembrane transporter activity
GO:0044710, portable, single-organism metabolic process
GO:0005811, portable, lipid particle
GO:0005310, portable, dicarboxylic acid transmembrane transporter activity
GO:0065007, portable, biological regulation
1g017461m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0009535, portable, chloroplast thylakoid membrane
GO:0008021, portable, synaptic vesicle
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0009624, portable, response to nematode
GO:0009416, portable, response to light stimulus
GO:0015294, portable, solute:cation symporter activity
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0015114, portable, phosphate ion transmembrane transporter activity
GO:0012505, portable, endomembrane system
GO:0046943, portable, carboxylic acid transmembrane transporter activity
GO:0065007, portable, biological regulation
1g016442m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0044237, portable, cellular metabolic process
GO:0008021, portable, synaptic vesicle
GO:0015698, portable, inorganic anion transport
GO:0015807, portable, L-amino acid transport
GO:0015739, portable, sialic acid transport
GO:0015144, portable, carbohydrate transmembrane transporter activity
GO:0015136, portable, sialic acid transmembrane transporter activity
GO:0006814, portable, sodium ion transport
GO:0009535, portable, chloroplast thylakoid membrane
GO:0016529, portable, sarcoplasmic reticulum
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0005764, portable, lysosome
GO:0050896, portable, response to stimulus
GO:0005436, portable, sodium:phosphate symporter activity
GO:0012505, portable, endomembrane system
GO:0065007, portable, biological regulation
1g009757m portable GO:0005315, confident, inorganic phosphate transmembrane transporter activity
GO:0009535, portable, chloroplast thylakoid membrane
GO:0044237, portable, cellular metabolic process
GO:0034220, portable, ion transmembrane transport
GO:0015807, portable, L-amino acid transport
GO:0005313, portable, L-glutamate transmembrane transporter activity
GO:0009624, portable, response to nematode
GO:0015319, portable, sodium:inorganic phosphate symporter activity
GO:0009416, portable, response to light stimulus
GO:0006835, portable, dicarboxylic acid transport
GO:0001505, portable, regulation of neurotransmitter levels
GO:0015706, portable, nitrate transport
GO:0015739, portable, sialic acid transport
GO:0048786, portable, presynaptic active zone
GO:0015136, portable, sialic acid transmembrane transporter activity
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0030672, portable, synaptic vesicle membrane
GO:0006814, portable, sodium ion transport
GO:0015321, portable, sodium-dependent phosphate transmembrane transporter activity
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0005764, portable, lysosome
GO:0044341, portable, sodium-dependent phosphate transport
GO:0005351, portable, sugar:hydrogen symporter activity
1g012315m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0009535, portable, chloroplast thylakoid membrane
GO:0009706, portable, chloroplast inner membrane
GO:0008021, portable, synaptic vesicle
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0009624, portable, response to nematode
GO:0009416, portable, response to light stimulus
GO:0015294, portable, solute:cation symporter activity
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0055085, portable, transmembrane transport
GO:0015114, portable, phosphate ion transmembrane transporter activity
GO:0046943, portable, carboxylic acid transmembrane transporter activity
1g013802m portable GO:0005774, portable, vacuolar membrane
GO:0005886, portable, plasma membrane
GO:0034220, portable, ion transmembrane transport
GO:0015807, portable, L-amino acid transport
GO:0015809, portable, arginine transport
GO:0015181, portable, arginine transmembrane transporter activity
1g022198m portable GO:0005315, portable, inorganic phosphate transmembrane transporter activity
GO:0009535, portable, chloroplast thylakoid membrane
GO:0009706, portable, chloroplast inner membrane
GO:0015747, portable, urate transport
GO:0008021, portable, synaptic vesicle
GO:0015143, portable, urate transmembrane transporter activity
GO:0015698, portable, inorganic anion transport
GO:0016324, portable, apical plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0009624, portable, response to nematode
GO:0006855, portable, drug transmembrane transport
GO:0009416, portable, response to light stimulus
GO:0015562, portable, efflux transmembrane transporter activity
GO:0005789, portable, endoplasmic reticulum membrane
GO:0046415, portable, urate metabolic process
GO:0015238, portable, drug transmembrane transporter activity
GO:0030504, portable, inorganic diphosphate transmembrane transporter activity
GO:0048471, portable, perinuclear region of cytoplasm
GO:0016529, portable, sarcoplasmic reticulum
GO:0044070, portable, regulation of anion transport
GO:0005887, portable, integral to plasma membrane
GO:0019534, portable, toxin transporter activity
GO:0005436, portable, sodium:phosphate symporter activity
GO:0008308, portable, voltage-gated anion channel activity
GO:0046943, portable, carboxylic acid transmembrane transporter activity
1g012508m portable GO:0005774, confident, vacuolar membrane
GO:0071369, portable, cellular response to ethylene stimulus
GO:0071281, portable, cellular response to iron ion
GO:0071732, portable, cellular response to nitric oxide
GO:0005886, portable, plasma membrane
GO:0015807, portable, L-amino acid transport
GO:0006868, portable, glutamine transport
GO:0015186, portable, L-glutamine transmembrane transporter activity
GO:0005275, portable, amine transmembrane transporter activity
GO:0030424, portable, axon
GO:0003333, portable, amino acid transmembrane transport
1g016338m portable GO:0005315, confident, inorganic phosphate transmembrane transporter activity
GO:0008021, portable, synaptic vesicle
GO:0006817, portable, phosphate ion transport
GO:0015807, portable, L-amino acid transport
GO:0005789, portable, endoplasmic reticulum membrane
GO:0015706, portable, nitrate transport
GO:0046415, portable, urate metabolic process
GO:0009535, portable, chloroplast thylakoid membrane
GO:0055085, portable, transmembrane transport
GO:0009706, portable, chloroplast inner membrane
GO:0005887, portable, integral to plasma membrane
GO:0042221, portable, response to chemical stimulus
GO:0005436, portable, sodium:phosphate symporter activity
GO:0005351, portable, sugar:hydrogen symporter activity
GO:0065007, portable, biological regulation
GO:0046943, portable, carboxylic acid transmembrane transporter activity